30 HP Yanmar: Repower v. Rebuild?
 

Let the debate begin........

Repower for the 21st century
Or
Rebuild a 1979 Yanmar 3QM30H (raw water cooled)?

Lets assume the engine is DOA and must be either replaced or rebuilt.
My first experience with replacing an engine was attempting to shovel a
huge Cadillac engine into a Nova. Boys will be boys. Lesson learned:
Lots of adjusting and cutting. But hopefully those who have actually
repowered a 34'-41' keel boat learned a few lessons from their
choice.

This is not a troll. I seek your advice with the greatest sincerity. So
be brutal or humble or descriptive adn I'll gleen what I can.

After reading my latest issue of Boats & Harbors I wish I had a 6-71.
Either way it would be cheaper than my little 27 hp Yanmar. Go figure.

Cordially,
Bob

30 HP Yanmar: Repower v. Rebuild?
 

My thought .. the engine fits the stringers, and therefore it would be easy
to take out and put back in.

So,, why not just get the engine rebuilt.

Can't you take it out, bring it to a rebuild place, get it all done over
with new this and new that .. then bring it back and put right back where it
came from?


"Bob" wrote in message
ups.com...
Let the debate begin........

Repower for the 21st century
Or
Rebuild a 1979 Yanmar 3QM30H (raw water cooled)?

Lets assume the engine is DOA and must be either replaced or rebuilt.
My first experience with replacing an engine was attempting to shovel a
huge Cadillac engine into a Nova. Boys will be boys. Lesson learned:
Lots of adjusting and cutting. But hopefully those who have actually
repowered a 34'-41' keel boat learned a few lessons from their
choice.

This is not a troll. I seek your advice with the greatest sincerity. So
be brutal or humble or descriptive adn I'll gleen what I can.

After reading my latest issue of Boats & Harbors I wish I had a 6-71.
Either way it would be cheaper than my little 27 hp Yanmar. Go figure.

Cordially,
Bob

30 HP Yanmar: Repower v. Rebuild?
 

NE Sailboat wrote:
My thought .. the engine fits the stringers, and therefore it would be easy
to take out and put back in.

So,, why not just get the engine rebuilt.

Can't you take it out, bring it to a rebuild place, get it all done over
with new this and new that .. then bring it back and put right back where it
came from?

Yes, that was my thought too. But there are some folks that say
"upgrade" to more modern model. ANd then mention part availibility
problems on 30 year old models. But when I went to my local tractor
dealer they didnt blink an eye when I asked for a rebuild quote on a
marine qm yanmar. The problem was the $6000 he quoted for the rebuild.
Thats a lot of money for a 30 yo motor.

But when I think of trying to modify an existing space for a diffrent
engine I start having flashbacks of a cutting torch and endless detail
modifications. I really like the idea of an exact foot print...... easy
out easy in. But????

Reluctant Bob

30 HP Yanmar: Repower v. Rebuild?
 

How old are you?

If this is a sailboat engine, there is a good chance you won't still be
sailing by the time it needs another part after a complete rebuild.

--
Roger Long

30 HP Yanmar: Repower v. Rebuild?
 

Roger Long wrote:
How old are you?

If this is a sailboat engine, there is a good chance you won't still be
sailing by the time it needs another part after a complete rebuild.

--
Roger Long

Damn good point Roger.
Im 53. The boat, built in 1979, & 3QM are 26 yo.
So if it lasted 26 the first time I really should not need to worry
about the second rebuild...............?
Bob

30 HP Yanmar: Repower v. Rebuild?
 

Bob wrote:

But there are some folks that say "upgrade" to more modern model.

Modern isn't always better. I don't know what is going on with small marine
diesels now but I fear my recent experience with aircraft maintenance may be
relevant to boats. If anyone has data to add on these points, I'd
appreciate hearing it.

In aviation, things that used to last for hundreds of hours a couple decades
ago began failing very rapidly about a decade ago. This applies to vital
engine parts like valve lifters and camshafts as well as flight instruments.

The reasons are all the globalization issues. A turn coordinator used to be
built in a place where someone who had been assembling them for 20 years
knew that if one part swung back and forth just a certain way when trial
assembled, it was good to continue. Otherwise the parts needed some
tweaking. The company gets bought by someone who thinks they can make a
profit by increasing effeciency so they fire everyone and hire younger
people who will work for less. All they know is that part A goes into part
B and they have to assemble 20% more than the old crew did or they'll be
looking for a job.

There is a specification and a procedure for heat treating valve lifter
faces. Somebody, or a crew who has been doing it for a long time, knows
something like the fact that letting the kiln cool down with the parts in it
instead of just taking them out is the difference between parts that fail
prematurely and those last. This never makes it into the specification
because it's just the way they've always done it. The company gets sold and
the production is moved to China where they follow the specifications to the
letter but the parts still start failing half way to overhaul time.

A lot of things like engines were designed to be built by artisans who cared
and understood them and have not made the transition to modern times
gracefully. A thouroughly modern engine built on a thouroughly modern
production line with the advantages of computer machining, etc. may be
better. Automotive engines certainly are. I'm not sure that something like
a small marine diesel is better simply because it's a newer model.

If I were replacing an engine in an aircraft and strapping my butt behind
it, I would prefer an engine overhauled by a good overhauler who looked at,
evaluated, and adjusted, each part individually than a brand new one from an
assembly line. I'm not sure this hold true for boats but my first
inclination if I had your engine would be to go for the overhaul.

--
Roger Long

30 HP Yanmar: Repower v. Rebuild?
 

"NE Sailboat" wrote in message
news:reush.9981$pb7.5843@trndny09...
My thought .. the engine fits the stringers, and therefore it would be
easy
to take out and put back in.

So,, why not just get the engine rebuilt.

Can't you take it out, bring it to a rebuild place, get it all done over
with new this and new that .. then bring it back and put right back where
it
came from?


I have the 2QM15 and it still runs and starts well. But, if it failed I
would have the same decision to make.

I think that I would seriously think about installing a new fresh water
cooled engine with heat exchanger. My concern after 27 years would be with
corrosion of the block, and it is difficult to determine this. Maybe there
is a way once the engine has been torn down?

I think that if I was younger (your age), I might consider doing the rebuild
myself, but maybe not. These engines do have cylinder so no need for
reboring or oversize pistons etc.sleeves.

I would think that I would pay $10k for a new engine if a rebuild cost $6k.
But, if the rebuild could be done for say $3k, I would go that way. As a
comparison, I had a complete rebuild done on a used block on my old diesel
car - a 5 cyl MB 300D. It cost me C$7k which at the time was about US$5k and
this included removing the old engine and also installing a rebuilt turbo.
$6k for a 2 or 3 cyl Yanmar rebuild sounds like a lot!

30 HP Yanmar: Repower v. Rebuild?
 

I'm 56 and my 1980 Yanmar 2QM20 runs as well as I would expect a brand new
engine to run.

I'm not expecting to rebuild it either.

--
Roger Long

30 HP Yanmar: Repower v. Rebuild?
 

Bob wrote:
....
Yes, that was my thought too. But there are some folks that say
"upgrade" to more modern model. ANd then mention part availibility
problems on 30 year old models. But when I went to my local tractor
dealer they didnt blink an eye when I asked for a rebuild quote on a
marine qm yanmar. The problem was the $6000 he quoted for the rebuild.
Thats a lot of money for a 30 yo motor.


That sounds like a lot - I have a friend that replaced a tired 3GM
with a new 3YM and he claimed it was well under $5K. The footprint
was almost identical, I think there were a few changes for the
plumbing, but the job was done in a day. He didn't need a
transmission, and there was 100% access so YMMV. You should shop
around a bit before listening to one quote.

But when I think of trying to modify an existing space for a diffrent
engine I start having flashbacks of a cutting torch and endless detail
modifications. I really like the idea of an exact foot print...... easy
out easy in. But????

30 HP Yanmar: Repower v. Rebuild?
 

Bob wrote:

The problem was the $6000 he quoted for the rebuild.
Thats a lot of money for a 30 yo motor.


Reluctant Bob


Geez, Tbat $6K should just about pay for a new
3YM30, and I'd bet the footprint is nearly
identical. You wouldn't have to rebuild the
stringers, but you might have to have custom
"vibration" mounts built to hit the bolt holes.

I'm in a similar situation except that I've got a
1983 3HM Yanmar sitting in the Irwin. It was
supposedly "overhauled" just before I bought the
boat, but overhauled can mean a lot of different
things depending on who is saying it. Right now,
it starts and runs great, so I'm going to let it
keep running, but I've already marked it down in
my mind as suspect for long voyages.

Have you gotten quotes on a new 3YM30? I'd also
think about going to fresh water cooling if I were
you.

Don W.

30 HP Yanmar: Repower v. Rebuild?
 

Yo ,, Bob... $6,000 for a rebuild of a motor? Something is wrong with this
picture.

I've priced out a few sailboat aux's recently. I think the price for a new
one was around $5,000.

Where did you get this quote? Did you call engine rebuilders? Something
just doesn't sound right.


"Bob" wrote in message
ps.com...

NE Sailboat wrote:
My thought .. the engine fits the stringers, and therefore it would be
easy
to take out and put back in.

So,, why not just get the engine rebuilt.

Can't you take it out, bring it to a rebuild place, get it all done over
with new this and new that .. then bring it back and put right back where
it
came from?

Yes, that was my thought too. But there are some folks that say
"upgrade" to more modern model. ANd then mention part availibility
problems on 30 year old models. But when I went to my local tractor
dealer they didnt blink an eye when I asked for a rebuild quote on a
marine qm yanmar. The problem was the $6000 he quoted for the rebuild.
Thats a lot of money for a 30 yo motor.

But when I think of trying to modify an existing space for a diffrent
engine I start having flashbacks of a cutting torch and endless detail
modifications. I really like the idea of an exact foot print...... easy
out easy in. But????

Reluctant Bob

30 HP Yanmar: Repower v. Rebuild?
 

"Roger Long" wrote in news:45b281b7$0$28089
:

All they know is that part A goes into part
B and they have to assemble 20% more than the old crew did or they'll be
looking for a job.


It's the reason Mercedes Benz no longer produces the finest automobiles in
Stuttgart, but builds a piece of SUV crap in Arkansas with the company
logon on it.

They are no longer listed on "The finest cars in the world" lists.....

Don't think so? Search google for lemon MB SUV models....Man those owners
are ****ED!

Larry - 1973 220D....simple, efficient, no electronics or computers.
--
Democracy is when two wolves and a sheep vote on who's for dinner.
Liberty is when the sheep has his own gun.

30 HP Yanmar: Repower v. Rebuild?
 

NE Sailboat wrote:
Yo ,, Bob... $6,000 for a rebuild of a motor? Something is wrong with this
picture.

I've priced out a few sailboat aux's recently. I think the price for a new
one was around $5,000.

Yes, I agree. I walked into a local John deer tractor dealer and made
the mistake of starting with, "I have a sailboat...." Actually the
quote was $5800 and some change.

i just did some more searching and found a rebuilder that has two
3QM30H RW for $4400 each. But rebuilds do differ from shop to shop. But
the tractor quote did seem way out of line. Another factor to consder
is the QM weighs about 750 lbs! I under stand the newer models run 1/2
that. Maybe more room for fuel??? Nah, rum.

30 HP Yanmar: Repower v. Rebuild?
 

Bob wrote:

Yes, that was my thought too. But there are some folks that say
"upgrade" to more modern model. ANd then mention part availibility
problems on 30 year old models. But when I went to my local tractor
dealer they didnt blink an eye when I asked for a rebuild quote on a
marine qm yanmar. The problem was the $6000 he quoted for the rebuild.
Thats a lot of money for a 30 yo motor.




I think $2000 per cylinder is a pretty standard charge for rebuilding a
diesel. $6000 for a three-lunger is not out of line. This is an engine
commonly used in sailboats. If its the original engine, a rebuild will
probably last the remaining life of the boat.

30 HP Yanmar: Repower v. Rebuild?
 

Roger Long wrote:
Bob wrote:
But there are some folks that say "upgrade" to more modern model.

Modern isn't always better.
Roger Long

Hi, good point.
I had a conversation with a shop manager at my local GM (car) dealer.
My 1994 car toasted a
heater blower switch and had it replaced in 2000. It failed after 2 ½
years. I put in another one and it failed after 3 years. Each was
genuine GM parts from my genuine GM dealer.

The shop manager explained to me that engineers use computers now and
design more efficiently (insert wise crack here). These efficient
designs reduce the once common and expensive practice of over building
parts that contained wasted potential and added to unwanted weight and
increased costs. My response was, and reduced unit reliability! No
response from the shop manager.

I like to keep things simple. A rebuild and easy replacement sounds a
lot les frustrating than hoping for a similar foot print and all the
potential adapting. My motor lives under the sink in the middle of my
galley. I aint got but an inch any way around for clearance. Great for
engine access when I pull all the covers but I imagine a bear to make
something different fit.

But scheesh... when I sell the boat in 20 years who is going to buy a
boat with a 50 year old motor obviously with at leaser one rebuild?!?!

**** that statement is dumb, who is going to buy a 50 year old boat!?!?
Bob

30 HP Yanmar: Repower v. Rebuild?
 

Bob ,, the BETA 16hp,, maybe not quite what you are looking for but ...

only weighs 205lbs!

I've looked at that engine. It isn't the most powerful deisel but ...
205lbs! Isn't that sweet.

=============================
"Bob" wrote in message
ps.com...

NE Sailboat wrote:
Yo ,, Bob... $6,000 for a rebuild of a motor? Something is wrong with
this
picture.

I've priced out a few sailboat aux's recently. I think the price for a
new
one was around $5,000.

Yes, I agree. I walked into a local John deer tractor dealer and made
the mistake of starting with, "I have a sailboat...." Actually the
quote was $5800 and some change.

i just did some more searching and found a rebuilder that has two
3QM30H RW for $4400 each. But rebuilds do differ from shop to shop. But
the tractor quote did seem way out of line. Another factor to consder
is the QM weighs about 750 lbs! I under stand the newer models run 1/2
that. Maybe more room for fuel??? Nah, rum.

30 HP Yanmar: Repower v. Rebuild?
 

I went that route before with a one cylinder 1982 yanmar. It cost me $3600
CAD to have the engine overhaul. After 20 hours of running time the crank
shaft broke in two. I am still trying to get it fix under "warranty". The
guy that overhauled the engine said that it not worth spending any more
money. I have learned a lesson the hard way. A rebuild, overhaul, or
refurbished 20 years old diesel engine could turn out to be a nightmare.
The new components may be of quality but the engine block may not.
Plus the warranty on rebuild engine (If you have a valid one and if they are
willing to honour it) is in days whether the boat is at the dock or not.
FWIW

"NE Sailboat" wrote in message
news:iWIsh.4446$8P.2669@trndny05...
Bob ,, the BETA 16hp,, maybe not quite what you are looking for but ...

only weighs 205lbs!

I've looked at that engine. It isn't the most powerful deisel but ...
205lbs! Isn't that sweet.

=============================
"Bob" wrote in message
ps.com...

NE Sailboat wrote:
Yo ,, Bob... $6,000 for a rebuild of a motor? Something is wrong with
this
picture.

I've priced out a few sailboat aux's recently. I think the price for a
new
one was around $5,000.

Yes, I agree. I walked into a local John deer tractor dealer and made
the mistake of starting with, "I have a sailboat...." Actually the
quote was $5800 and some change.

i just did some more searching and found a rebuilder that has two
3QM30H RW for $4400 each. But rebuilds do differ from shop to shop. But
the tractor quote did seem way out of line. Another factor to consder
is the QM weighs about 750 lbs! I under stand the newer models run 1/2
that. Maybe more room for fuel??? Nah, rum.

30 HP Yanmar: Repower v. Rebuild?
 

When I took over the management and maintenance of the 172 I used to fly,
the original turn coordinator installed in the panel in 1976 was still in
the plane. By the time I stopped flying five years later, we had put two
new ones in. Same design from the same company. Workmanship is as important
as design.

Much of the resdesign you talk about is intended to make workmanship less
important in the quality of the final product. It certainly does that. No
matter how good or bad the workmanship is, the product is still a piece of
crap!

--
Roger Long

30 HP Yanmar: Repower v. Rebuild?
 

Bob,

Your original post no longer shows up but I think from some responses I may
have missed the point that your engine is salt water cooled. If that is the
case, I would not rebuild it. My engine was run in fresh water till I
bought the boat so is probably worth an overhaul.

I was told at a boat show that the new Yanmars drop right into the same
space as the old ones. These are great engines and a new 3GM is probably
your best bet.

BTW more often than not when I'm advising someone on repowering a sailboat,
I'll find that they have a 3 cylinder engine but a prop that can only use
the horsepower of a 2 cylinder. You very well might be able to put in a
lighter and cheaper 2GM that would be happier running closer to its design
point and give you the same performance you have now. It wouldn't be quite
as smooth but the 2QM running a 2 blade prop in my boat is as smooth as I
could ask for. Fuel economy will also be slightly better taking the same
horsepower out of one less cylinder. The 2GM should fit easily on the same
beds as the 3GM with more room at one end.

I can give you a rough answer on this if you tell me:

Displacement
Length on Waterline

I can give you a better answer if you an also tell me:

Current HP and reduction gear ratio
Prop size, pitch' and number of blades
Propeller aperture size
C
Current max RPM and speed at that RPM

--
Roger Long

30 HP Yanmar: Repower v. Rebuild?
 

Roger Long wrote:
I can give you a rough answer on this if you tell me:

Displacement
Length on Waterline

I can give you a better answer if you an also tell me:

Current HP and reduction gear ratio
Prop size, pitch' and number of blades
Propeller aperture size
C
Current max RPM and speed at that RPM
Roger Long

Hi Roger:
Thanks for the reply. Yes, my QM is a raw water engine. I need to dig
out my manual for the Hurth-18 gear ratio. 2.37 may be the answer but I
need to check And this is another issue: I read the hurth18 was a
special model for the qm only. A rare pair with no parts availble. Seem
to remember a post about having to ceate a modifed flange and fit
another hurth gear on the QMs. My head hurts thinking about this.
Ill post the specs you requesed in a couple days. Thank you for
offering your time on this.
Bob

30 HP Yanmar: Repower v. Rebuild?
 

On Sun, 21 Jan 2007 09:27:42 -0500, "Roger Long"
wrote:

Your original post no longer shows up but I think from some responses I may
have missed the point that your engine is salt water cooled. If that is the
case, I would not rebuild it.

That's an excellent point, and I agree 100%.

You can not save a block with significant amounts of internal rust.

30 HP Yanmar: Repower v. Rebuild?
 

On Sun, 21 Jan 2007 00:47:54 -0600, xorbit wrote:

I think $2000 per cylinder is a pretty standard charge for rebuilding a
diesel.

That's the going rate for something like a 300 hp, 3,000 pound Detroit
6-71.

30 HP Yanmar: Repower v. Rebuild?
 

Wayne.B wrote:
On Sun, 21 Jan 2007 00:47:54 -0600, xorbit wrote:

I think $2000 per cylinder is a pretty standard charge for rebuilding a
diesel.

That's the going rate for something like a 300 hp, 3,000 pound Detroit
6-71.


Yes..... Da ya think parts made since 1938 might have somthing to do
with it. Belive me, if I could fit a one of thoes green two stroke
screaming beasts in my boat I would in a heart beat. But am stuck with
a japanese manufacture that appearantly decided to forge their parts
from unobtainium.
Buy American Bob

30 HP Yanmar: Repower v. Rebuild?
 

Wayne.B wrote:
On Sun, 21 Jan 2007 00:47:54 -0600, xorbit wrote:

I think $2000 per cylinder is a pretty standard charge for rebuilding a
diesel.

That's the going rate for something like a 300 hp, 3,000 pound Detroit
6-71.


Yes..... Da ya think parts made since 1938 might have somthing to do
with it. Belive me, if I could fit a one of thoes green two stroke
screaming beasts in my boat I would in a heart beat. But am stuck with
a japanese manufacture that appearantly decided to forge their parts
from unobtainium.
Buy American Bob

30 HP Yanmar: Repower v. Rebuild?
 

In article . com,
"Bob" wrote:

Repower for the 21st century
Or
Rebuild a 1979 Yanmar 3QM30H (raw water cooled)?


We repowered when we got Xan. Am not likely to do that again. The costs
are about double the engine's, and the labor and time MUCH longer. At a
minimum, you'll need a new shaft and prop. [but you might want to
upgrade the prop anyway, as there have been some real improvements since
the raw-water Yanmars were made.]

A new 2GM20 will put out about the same power, perhaps more, and give
improved efficiency, but unless you're planning to keep the boat for 20
years, you won't realize much real benefit.

The Yanmars, old and new, are work horses. Ours has 1200 hours and about
all I need to do is change the oil and inspect the rest -- and keep the
fuel clean, the only problem we've had other than a plugged cooling line
at the inlet.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's NEW Pages: http://web.mac.com/jerelull/iWeb/Xan/
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/

30 HP Yanmar: Repower v. Rebuild?
 

"Jere Lull" wrote

A new 2GM20 will put out about the same power, perhaps more

The new 2 cylinders are called 15 HP engines but it is the ratings that have
changed; not the engines. Our "20"QM is really a 15.


The Yanmars, old and new, are work horses. Ours has 1200 hours and about
all I need to do is change the oil and inspect the rest -- and keep the
fuel clean, the only problem we've had other than a plugged cooling line
at the inlet.


This is a universal sentiment among Yanmar owners. I've seldom heard a
point of view expressed so consistently about a type of machinery.

--
Roger Long

30 HP Yanmar: Repower v. Rebuild?
 

On Mon, 22 Jan 2007 09:09:08 GMT, Jere Lull wrote:

The Yanmars, old and new, are work horses. Ours has 1200 hours and about
all I need to do is change the oil and inspect the rest -- and keep the
fuel clean, the only problem we've had other than a plugged cooling line
at the inlet.

I have a Yanmar diesel on my primary genset. Almost 1500 hours in two
years, only failures have been the raw water pump and several
impellers. Fortunately that was covered under warranty.

30 HP Yanmar: Repower v. Rebuild?
 

Jere Lull wrote:
In article . com,
"Bob" wrote:

Repower for the 21st century
Or
Rebuild a 1979 Yanmar 3QM30H (raw water cooled)?


We repowered when we got Xan. Am not likely to do that again. The costs
are about double the engine's,

So if a new engine retail price is $8,000 your saying when it is all
over total cost is $16,000?

May I ask about your specfics?
Cost of engine?
How many hours did the yard do?
How many DIY hours?
Total cost after everthing?
Did you have a problem fitting new onto the foot print of the old?
Bob


and the labor and time MUCH longer.

Who gave the time estimate?
How much over was the time estimate?

At a minimum, you'll need a new shaft and prop. [but you might want to
upgrade the prop anyway, as there have been some real improvements since
the raw-water Yanmars were made.]

Yes, real improvments over stone axes.


The Yanmars, old and new, are work horses. Ours has 1200 hours and about
all I need to do is change the oil and inspect the rest -- and keep the
fuel clean, the only problem we've had other than a plugged cooling line
at the inlet.
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's NEW Pages: http://web.mac.com/jerelull/iWeb/Xan/
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/


Thank you Jere,
Bob

30 HP Yanmar: Repower v. Rebuild?
 

In article ,
"Roger Long" wrote:


"Jere Lull" wrote

A new 2GM20 will put out about the same power, perhaps more

The new 2 cylinders are called 15 HP engines but it is the ratings that have
changed; not the engines. Our "20"QM is really a 15.

Sister boats with the old raw water 3GMs max out no faster than us and
are usually a bit slower. They always burn more fuel.

You can't go just by the numbers, as the older engines were geared
higher. Faster shaft and prop, more drag, less effective power. We swing
a 16x10" 3-blade.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's NEW Pages: http://web.mac.com/jerelull/iWeb/Xan/
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/

30 HP Yanmar: Repower v. Rebuild?
 

In article .com,
"Bob" wrote:

We repowered when we got Xan. Am not likely to do that again. The costs
are about double the engine's,

So if a new engine retail price is $8,000 your saying when it is all
over total cost is $16,000?

May I ask about your specfics?
Cost of engine?
Total cost after everthing?

In our case, $6k vs a bit over $12k, but that was 14 years ago.

How many hours did the yard do?
How many DIY hours?

All yard, as I didn't want to take 2 years to do it and knew I knew too
little. Truth be told, I take home more than their labor charge, and I
wanted to *sail*.

As I recall, about 1/2 or 1/3 of the extra was fittings, not labor.
Virtually everything needed replacing from battery cables and tank to
the bed, shaft and prop. A PO had gotten the new tank put in, so that
was one non-cost to us. New hoses, Racor, bigger through-hull and
cooling water filter, shift from 3/4" shaft to 1", larger exhaust &
water muffler, lots and lots of incidentals. Included the 50-hour
re-adjustments.

Did you have a problem fitting new onto the foot print of the old?

The old one had to go completely --tougher than expected-- and a new one
fabricated and glassed in. Work of art, BTW.

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's NEW Pages: http://web.mac.com/jerelull/iWeb/Xan/
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/

30 HP Yanmar: Repower v. Rebuild?
 

Jere Lull wrote:
You can't go just by the numbers, as the older engines were geared
higher. Faster shaft and prop, more drag, less effective power. We swing
a 16x10" 3-blade.

Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's NEW Pages: http://web.mac.com/jerelull/iWeb/Xan/
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/


Thanks Je

Very helpful information to chew. Your statment about owner earnings
compared to yard hourly rates is a very compelling concept. My earnings
come rather easily compared to what thoes hard working, knuckle bustin,
yard guys do daily.

You have detailed my nagging fear regarding "all the extras." I can see
how a new model repower just might start a cascade of events I am not
quite ready to handle.
Thanks again,
Bob

30 HP Yanmar: Repower v. Rebuild?
 

On Sat, 20 Jan 2007 10:06:22 -0800, Bob wrote:

Let the debate begin........

Repower for the 21st century
Or
Rebuild a 1979 Yanmar 3QM30H (raw water cooled)?


I went the repower route on Far Cove (story is at
http://www.bcboatnet.org/Tech/engine/index.html )

There are SO many things apart from the engine itself to consider: exhaust
system. Control cables (mine broke just as I was replacing them!).
prop/shaft/stuffingbox. And so on.

I put in what was supposed to be "like for like" and still had to redo the
stringers twice, completely redo the exhaust, and so on. If I had gone the
rebuild route, I probably would have done the other upgrades as well.

Now, Far Cove was substantially underpowered with the original 23hp, so
the 26hp was a good upgrade. If the replacement was the same hp, I
probably would have just rebuilt.

druid

30 HP Yanmar: Repower v. Rebuild?
 

On Jan 31, 9:14 pm, druid wrote:

I went the repower route on Far Cove (story is athttp://www.bcboatnet.org/Tech/engine/index.html)

Cool... I love the web.


There are SO many things apart from the engine itself to consider: exhaust
system. Control cables (mine broke just as I was replacing them!).
prop/shaft/stuffingbox. And so on.

Humm, yes. this is what I want to avoid. Ive jut spent few months
rerouting wires and hoses. NOt fun and a bit distructive. I come from
the school of the "fewer holes in a boat the better."


I put in what was supposed to be "like for like" and still had to redo the
stringers twice,

Ugg(

completely redo the exhaust, and so on. If I had gone the
rebuild route, I probably would have done the other upgrades as well.
druid

With my repower I too will also replace the c-bearing, shaft, coupler,
exhaust list. Just seems the way to go on a 30 yo boat.
The reason I am so gun shy about a new engine is that I just finished
replacing the suystems on our homee built in 1905 by a family of
farmers. Every time I started a simple two day project it always
tumbled into a total gut. Talk about icebergs?!? As a result we now
have all new wiring-plumbing-roof and my crowning glory, a 6' x 6' x
55' moat surrounding the back half of the house complete with 4" perf
pipe adn sump pump. That all started with, "honey the basement wall is
really ugly. I want to paint it somthing pretty." Sure, I said. When
the backhoe showed up my wife freaked out. A year later........ the
wall was painted.

Again thank you for taking the time to reply and that web link.
Bob