Although I have few elecrical gadgets to use power, I do worry about
having enough juice to run my VHF and running lights and am also
partial to having a small fan. Auto-pilot is also nice on long runs.
So what happens if my batteries accidently get run down? My old
Yanmar 1GM could be han cranked but my 2GM, no. However, while
looking into the engine compartment one day while under sail, I
noticed my prop shaft was spinning like mad cuz I hadnt put it in gear
(Yanmar says put it in reverse). So: maybe not so useless Idea #3727


Can you release the compression of the engine with the decompression
levers, get going good under sail with engine in gear an use the
spinning prop to sorta "push-start" the engine with you suddenly
giving it compression? I might try this next time I am out.

For that matter, I have heard of these spinning things you can drag
behind to generate power but I can imagine getting it caught on a crab
trap or something or having its line wrap round your prop. So, why
not put a v-belt pulley on the prop shaft and use it to turn a belt
attached to another alternator. This way you could charge your
batteries without starting the engine (sure it slows you down some).
This cannot be original cuz I know I saw it somewhere but cannot
imagine where.

I've never started a diesel this way, but 40 years ago we started a 4
cylinder gas engine by letting the prop spin and slam it into gear.

Actually I didn't think it would work, but it did and we were able to
recharge our dead battery.

Of course I always thought you couldn't push start a diesel but then someone
proved me wrong by getting a couple guys and push starting a 2.5 ton Izuzu
truck.

I think the key is to have the engine properly tuned, timed and primed
before you attempt this.


--
My opinion and experience. FWIW

Steve
s/v Good Intentions

Parallax wrote:


Can you release the compression of the engine with the decompression
levers, get going good under sail with engine in gear an use the
spinning prop to sorta "push-start" the engine with you suddenly

The large diesels used to power freighters can be restarted this way
quite easily, no compression release required.

This cannot be original cuz I know I saw it somewhere but cannot
imagine where.

Many of these same ships use a "shaft generator" driven off the
propeller shaft.

Rick

Used to start 6-71's with mechanical reverse gears, this way all the time.

Parallax wrote:
Although I have few elecrical gadgets to use power, I do worry about
having enough juice to run my VHF and running lights and am also
partial to having a small fan. Auto-pilot is also nice on long runs.
So what happens if my batteries accidently get run down? My old
Yanmar 1GM could be han cranked but my 2GM, no. However, while
looking into the engine compartment one day while under sail, I
noticed my prop shaft was spinning like mad cuz I hadnt put it in gear
(Yanmar says put it in reverse). So: maybe not so useless Idea #3727


Can you release the compression of the engine with the decompression
levers, get going good under sail with engine in gear an use the
spinning prop to sorta "push-start" the engine with you suddenly
giving it compression? I might try this next time I am out.

For that matter, I have heard of these spinning things you can drag
behind to generate power but I can imagine getting it caught on a crab
trap or something or having its line wrap round your prop. So, why
not put a v-belt pulley on the prop shaft and use it to turn a belt
attached to another alternator. This way you could charge your
batteries without starting the engine (sure it slows you down some).
This cannot be original cuz I know I saw it somewhere but cannot
imagine where.

You have to put the Yanmar in reverse to stop the prop because
reverse is mechanical. In forward the prop will still rotate because
it is fluid drive. So much for push starting a Yanmar. I was thinking
of getting one of the windup starters as a backup.

Doug

"Parallax" wrote in message
om...
Although I have few elecrical gadgets to use power, I do worry about
having enough juice to run my VHF and running lights and am also
partial to having a small fan. Auto-pilot is also nice on long runs.
So what happens if my batteries accidently get run down? My old
Yanmar 1GM could be han cranked but my 2GM, no. However, while
looking into the engine compartment one day while under sail, I
noticed my prop shaft was spinning like mad cuz I hadnt put it in gear
(Yanmar says put it in reverse). So: maybe not so useless Idea #3727


Can you release the compression of the engine with the decompression
levers, get going good under sail with engine in gear an use the
spinning prop to sorta "push-start" the engine with you suddenly
giving it compression? I might try this next time I am out.

For that matter, I have heard of these spinning things you can drag
behind to generate power but I can imagine getting it caught on a crab
trap or something or having its line wrap round your prop. So, why
not put a v-belt pulley on the prop shaft and use it to turn a belt
attached to another alternator. This way you could charge your
batteries without starting the engine (sure it slows you down some).
This cannot be original cuz I know I saw it somewhere but cannot
imagine where.

If you got the boat up to about 70 knots, you might have enough power
to crank a diesel.....but that's another problem....(c;

Aboard Lionheart, that spinning shaft turns a large belt pulley which
drives an alternator to help charge her massive battery banks and the
hydraulic pump motor on her new B&G Network Pilot steering the
rudderpost. There's some power in the spinning shaft, but not enough
to kickstart a 22:1 compression ratio diesel engine. Of course, we
get that effect by switching the shaft alternator over to her starting
batteries or switching her starter over to the massive house
monsters...same results.

Are you SURE you don't have a hand crank on a 2GM? We had one on the
3GM in the Endeavour 35. I tried it a couple of times and could crank
it quite easily because there were cylinders coming down under
pressure aiding me pushing the compression cylinder up, unlike the 1
lunger....(c;



On 16 Oct 2003 07:44:30 -0700, (Parallax)
wrote:

Although I have few elecrical gadgets to use power, I do worry about
having enough juice to run my VHF and running lights and am also
partial to having a small fan. Auto-pilot is also nice on long runs.
So what happens if my batteries accidently get run down? My old
Yanmar 1GM could be han cranked but my 2GM, no. However, while
looking into the engine compartment one day while under sail, I
noticed my prop shaft was spinning like mad cuz I hadnt put it in gear
(Yanmar says put it in reverse). So: maybe not so useless Idea #3727


Can you release the compression of the engine with the decompression
levers, get going good under sail with engine in gear an use the
spinning prop to sorta "push-start" the engine with you suddenly
giving it compression? I might try this next time I am out.

For that matter, I have heard of these spinning things you can drag
behind to generate power but I can imagine getting it caught on a crab
trap or something or having its line wrap round your prop. So, why
not put a v-belt pulley on the prop shaft and use it to turn a belt
attached to another alternator. This way you could charge your
batteries without starting the engine (sure it slows you down some).
This cannot be original cuz I know I saw it somewhere but cannot
imagine where.


Larry W4CSC

US Supports Apartheid! Vetoes UN resolution
condemning Apartheid Wall.
http://www.antiwar.com/hacohen/h052103.html
http://www.theage.com.au/articles/20...917478560.html
Can apartheid at home be far away?....
Apartheid NOW! Wall off Mississippi!

Parallax wrote:

Although I have few elecrical gadgets to use power, I do worry about
having enough juice to run my VHF and running lights and am also
partial to having a small fan. Auto-pilot is also nice on long runs.
So what happens if my batteries accidently get run down? My old
Yanmar 1GM could be han cranked but my 2GM, no. However, while
looking into the engine compartment one day while under sail, I
noticed my prop shaft was spinning like mad cuz I hadnt put it in gear
(Yanmar says put it in reverse). So: maybe not so useless Idea #3727


Can you release the compression of the engine with the decompression
levers, get going good under sail with engine in gear an use the
spinning prop to sorta "push-start" the engine with you suddenly
giving it compression? I might try this next time I am out.


Unluckily, your (and our) prop freewheels in forward. If you slam it
into reverse, you would try to start the engine in the wrong direction.

Best would probably be a solar panel. Turn everything off for an hour or
two and even a 12w panel might give you enough juice: 2GMs really don't
need much power to start if everything else is in good shape.

Changing my mind: Best is two battery banks. Only draw from one at a
time, but always charge both. And upgrade any of your battery leads that
is less than 1/0. We can start off one of our group 31 batteries during
the summer even if it's showing about 11.5v. (When it's chilly, we need
better voltage, but I haven't checked it since I upgraded our cables.)

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/

otnmbrd wrote in message link.net...
Used to start 6-71's with mechanical reverse gears, this way all the time.

Parallax wrote:
Although I have few elecrical gadgets to use power, I do worry about
having enough juice to run my VHF and running lights and am also
partial to having a small fan. Auto-pilot is also nice on long runs.
So what happens if my batteries accidently get run down? My old
Yanmar 1GM could be han cranked but my 2GM, no. However, while
looking into the engine compartment one day while under sail, I
noticed my prop shaft was spinning like mad cuz I hadnt put it in gear
(Yanmar says put it in reverse). So: maybe not so useless Idea #3727


Can you release the compression of the engine with the decompression
levers, get going good under sail with engine in gear an use the
spinning prop to sorta "push-start" the engine with you suddenly
giving it compression? I might try this next time I am out.

For that matter, I have heard of these spinning things you can drag
behind to generate power but I can imagine getting it caught on a crab
trap or something or having its line wrap round your prop. So, why
not put a v-belt pulley on the prop shaft and use it to turn a belt
attached to another alternator. This way you could charge your
batteries without starting the engine (sure it slows you down some).
This cannot be original cuz I know I saw it somewhere but cannot
imagine where.

Bob Griffith wrote about doing this regularly on his cutter "Awahanee"
in his book "Bluye Water"; went on a beam reach and when she was going
fast enough, put her in gear.
john

Doug,

I think you're thinking of the 35 engine The transmission in the 1gm (and 2
and 3GM) are all purely mechanical. At least from my investigation of the
service manual, the forward gear is a mirror image of the reverse gear. the
cluch cone simply bears against the forward drive gear, just like it does in
reverse. The transmission is "spalsh lubricated, not hydraulic at all.

Still it doesn't mean you can bump start. The 2GM20F in my doc neighbours
boat (Tanzer 31)is hand startable. Parallax's should be also, you just need
to use the decompression levers. (the hand crank drive pin has a bolted on
cover plate on the newer 2GM20F's) so it looks like it's not hand
startable, just take the plate off and cut the end off Reinstall and your
engine is now hand crankable!

Pierre
"Doug Dotson" wrote in message
...
You have to put the Yanmar in reverse to stop the prop because
reverse is mechanical. In forward the prop will still rotate because
it is fluid drive. So much for push starting a Yanmar. I was thinking
of getting one of the windup starters as a backup.

Doug

"Parallax" wrote in message
om...
Although I have few elecrical gadgets to use power, I do worry about
having enough juice to run my VHF and running lights and am also
partial to having a small fan. Auto-pilot is also nice on long runs.
So what happens if my batteries accidently get run down? My old
Yanmar 1GM could be han cranked but my 2GM, no. However, while
looking into the engine compartment one day while under sail, I
noticed my prop shaft was spinning like mad cuz I hadnt put it in gear
(Yanmar says put it in reverse). So: maybe not so useless Idea #3727


Can you release the compression of the engine with the decompression
levers, get going good under sail with engine in gear an use the
spinning prop to sorta "push-start" the engine with you suddenly
giving it compression? I might try this next time I am out.

For that matter, I have heard of these spinning things you can drag
behind to generate power but I can imagine getting it caught on a crab
trap or something or having its line wrap round your prop. So, why
not put a v-belt pulley on the prop shaft and use it to turn a belt
attached to another alternator. This way you could charge your
batteries without starting the engine (sure it slows you down some).
This cannot be original cuz I know I saw it somewhere but cannot
imagine where.

I had a Trojan Group 24 that easily started my 3GM30F

Pierre
"Jere Lull" wrote in message
...
Parallax wrote:

Although I have few elecrical gadgets to use power, I do worry about
having enough juice to run my VHF and running lights and am also
partial to having a small fan. Auto-pilot is also nice on long runs.
So what happens if my batteries accidently get run down? My old
Yanmar 1GM could be han cranked but my 2GM, no. However, while
looking into the engine compartment one day while under sail, I
noticed my prop shaft was spinning like mad cuz I hadnt put it in gear
(Yanmar says put it in reverse). So: maybe not so useless Idea #3727


Can you release the compression of the engine with the decompression
levers, get going good under sail with engine in gear an use the
spinning prop to sorta "push-start" the engine with you suddenly
giving it compression? I might try this next time I am out.


Unluckily, your (and our) prop freewheels in forward. If you slam it
into reverse, you would try to start the engine in the wrong direction.

Best would probably be a solar panel. Turn everything off for an hour or
two and even a 12w panel might give you enough juice: 2GMs really don't
need much power to start if everything else is in good shape.

Changing my mind: Best is two battery banks. Only draw from one at a
time, but always charge both. And upgrade any of your battery leads that
is less than 1/0. We can start off one of our group 31 batteries during
the summer even if it's showing about 11.5v. (When it's chilly, we need
better voltage, but I haven't checked it since I upgraded our cables.)

--
Jere Lull
Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD)
Xan's Pages: http://members.dca.net/jerelull/X-Main.html
Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/