Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Bob La Londe
 
Posts: n/a
Default Trouble shooting Mercury 1882 150 V-8

Trouble shooting Mercury 1882 150 V-8

Sounds like it isn't running on all cylinders, and power loss problem is
getting worse.

I check all my connections at the battery. I cut off all the battery
connectors and soldered on new replacement ring terminals (+ & -) to make
sure I wasn't having any bad ground issues there.

It has new plugs, I did a compression check per the manual and I got 130-135
psi on all cylinders 6 cylinders.

When I first noticed the problem it would lose power going down the lake.
Now it sounds more like it is running most of the time on less than normal
cylinders and occassionally starts firing on the rest for a few seconds.

I didn't see a coil test procedure in my service manual. Would that be the
next step? Or how how the control boxes? I believe it has the flywheel
alternator ignition setup as described in my manula, but I have not pulled
the flywheel to look.

My fuel tanks are below deck and very difficult remove, or I would flush
them out to make sure there is no water. I have new fuel line from the tank
to the motor. I am just running on one tank for now until I get this
figured out. I did order a water seperator for it which will arrive
wednesday. I just don't feel like that is the problem since it has gotten
progressively worse, and I have run a couple tanks of gas through it.

It feels like ignition to me.

What do I check next.


--
Bob La Londe
Yuma, Az
http://yumabassman.4t.com


  #2   Report Post  
Bob La Londe
 
Posts: n/a
Default Oops - Menat to say V-6 not V-8

Trouble shooting Mercury 1882 150 V-6 not V-8



  #3   Report Post  
Clams Canino
 
Posts: n/a
Default Trouble shooting Mercury 1882 150 V-6

We are assuming you are SURE your don't have a diry (clogged) carb or carbs.
OK?

First have someone crank the boat and do a static spark test. If all 6 spark
then your low speed stator winding is OK and (barring a thermal
intermittant) so are your switchboxes, coils and trigger.

Now while on the water try to determine what cylinders are not firing at
speed using an inductive timing light as a test tool. If they are all
firing - back to the fuel system you go.

If some are not firing at speed - suspect the high speed winding in the
stator and/or a thermal intermittant in a switchbox or coil. This will be
hard to track down.

Your motor uses Alternator Discharge Ignition (ADI). You need to 1st ohm
out the stator to see if it meets specs, if not replace it. (and hope that's
the end)

Then ohm out all the little ignition coils seperately to make sure they are
all good (at least when cold)

From there try to find it by swapping - you get identical 6 coils and 2
identical switchboxes. Try to swap stuff around to see if the problem
follows any one part.

-W








--

PLEASE NOTE: Email address change from to

"Bob La Londe" wrote in message
...
Trouble shooting Mercury 1882 150 V-8

Sounds like it isn't running on all cylinders, and power loss problem is
getting worse.

I check all my connections at the battery. I cut off all the battery
connectors and soldered on new replacement ring terminals (+ & -) to make
sure I wasn't having any bad ground issues there.

It has new plugs, I did a compression check per the manual and I got

130-135
psi on all cylinders 6 cylinders.

When I first noticed the problem it would lose power going down the lake.
Now it sounds more like it is running most of the time on less than normal
cylinders and occassionally starts firing on the rest for a few seconds.

I didn't see a coil test procedure in my service manual. Would that be

the
next step? Or how how the control boxes? I believe it has the flywheel
alternator ignition setup as described in my manula, but I have not pulled
the flywheel to look.

My fuel tanks are below deck and very difficult remove, or I would flush
them out to make sure there is no water. I have new fuel line from the

tank
to the motor. I am just running on one tank for now until I get this
figured out. I did order a water seperator for it which will arrive
wednesday. I just don't feel like that is the problem since it has gotten
progressively worse, and I have run a couple tanks of gas through it.

It feels like ignition to me.

What do I check next.


--
Bob La Londe
Yuma, Az
http://yumabassman.4t.com




  #4   Report Post  
Bob La Londe
 
Posts: n/a
Default Trouble shooting Mercury 1882 150 V-6

I just checked it idling in the driveway with my timing light. I had fire
on all 6. Same at 2000 and 3000 rpm. Didn't want to turn it any faster
than that because my water hose didn't deliver enough water at 3000 to keep
a steady stream of water and I don't want to risk overheating.

I suppose I need to due the same thing under load on the water. That can be
pretty tricky.

I have a water seperator on the way. I think I'll go get a cheap universal
electric fuel pump and pump all the gas out of the tanks and see if that
helps at all. I guess I can go get a 6 gallon portable fuel tank and try
that too as you suggest.

When I was trying to figure this out before (when it wasn't as bad as it is
now) somebody suggested a fuel additive called Dry Gas. I was not able to
find anything like that on the internet. Is that for real?

How can I check fuel flow in the carbs? Do I just have to pull them off and
tear them down?



"Clams Canino" wrote in message
newsRGQa.62034$ye4.44104@sccrnsc01...
And by the way - this is a big assumption. If you can get fire on all 6
while cranking it, and your stator ohms out OK, odds shift rapidly to fuel
issues. Prolly a clogged carb jet etc.

Borrow a 6 gallon "dummy can" and try that for a fuel source also to
eliminate your entire tank system.

-W

"Clams Canino" wrote in message
news:r8GQa.61960$Ph3.5781@sccrnsc04...
We are assuming you are SURE your don't have a diry (clogged) carb or

carbs.
OK?





  #5   Report Post  
Clams Canino
 
Posts: n/a
Default Trouble shooting Mercury 1882 150 V-6

I'd say that at this point in the game you outta tear the whole fuel suystem
down and clean / replace stuff yes. You can test if it's a *water in gas*
issue with a fresh dummy can. Past that - it's time to pay the piper and
tear 'em down.

-W




--

PLEASE NOTE: Email address change from to

"Bob La Londe" wrote in message
...
I just checked it idling in the driveway with my timing light. I had fire
on all 6. Same at 2000 and 3000 rpm. Didn't want to turn it any faster
than that because my water hose didn't deliver enough water at 3000 to

keep
a steady stream of water and I don't want to risk overheating.

I suppose I need to due the same thing under load on the water. That can

be
pretty tricky.

I have a water seperator on the way. I think I'll go get a cheap

universal
electric fuel pump and pump all the gas out of the tanks and see if that
helps at all. I guess I can go get a 6 gallon portable fuel tank and try
that too as you suggest.

When I was trying to figure this out before (when it wasn't as bad as it

is
now) somebody suggested a fuel additive called Dry Gas. I was not able to
find anything like that on the internet. Is that for real?

How can I check fuel flow in the carbs? Do I just have to pull them off

and
tear them down?



"Clams Canino" wrote in message
newsRGQa.62034$ye4.44104@sccrnsc01...
And by the way - this is a big assumption. If you can get fire on all 6
while cranking it, and your stator ohms out OK, odds shift rapidly to

fuel
issues. Prolly a clogged carb jet etc.

Borrow a 6 gallon "dummy can" and try that for a fuel source also to
eliminate your entire tank system.

-W

"Clams Canino" wrote in message
news:r8GQa.61960$Ph3.5781@sccrnsc04...
We are assuming you are SURE your don't have a diry (clogged) carb or

carbs.
OK?









  #6   Report Post  
noah
 
Posts: n/a
Default Trouble shooting Mercury 1882 150 V-6

On Mon, 14 Jul 2003 16:54:27 -0700, "Bob La Londe"
wrote:

I just checked it idling in the driveway with my timing light. I had fire
on all 6. Same at 2000 and 3000 rpm. Didn't want to turn it any faster
than that because my water hose didn't deliver enough water at 3000 to keep
a steady stream of water and I don't want to risk overheating.

I suppose I need to due the same thing under load on the water. That can be
pretty tricky.

I have a water seperator on the way. I think I'll go get a cheap universal
electric fuel pump and pump all the gas out of the tanks and see if that
helps at all. I guess I can go get a 6 gallon portable fuel tank and try
that too as you suggest.

When I was trying to figure this out before (when it wasn't as bad as it is
now) somebody suggested a fuel additive called Dry Gas. I was not able to
find anything like that on the internet. Is that for real?

How can I check fuel flow in the carbs? Do I just have to pull them off and
tear them down?



"Clams Canino" wrote in message
newsRGQa.62034$ye4.44104@sccrnsc01...
And by the way - this is a big assumption. If you can get fire on all 6
while cranking it, and your stator ohms out OK, odds shift rapidly to fuel
issues. Prolly a clogged carb jet etc.

Borrow a 6 gallon "dummy can" and try that for a fuel source also to
eliminate your entire tank system.

-W

"Clams Canino" wrote in message
news:r8GQa.61960$Ph3.5781@sccrnsc04...
We are assuming you are SURE your don't have a diry (clogged) carb or

carbs.
OK?





Bob- hooking up a portable 6 gallon can will be "cheap insurance".
If it runs OK, you know it's a fuel problem. If not, you know it's
ignition or dirty carbs. I strongly suggest that you try the "6
gallon test". It could save you money.

Also- yes, "dry gas" is a real product, available at any gas station.
It will help remove water contamination in fuel, if used per
instructions.
Good luck.
noah

Courtesy of Lee Yeaton,
See the boats of rec.boats
www.TheBayGuide.com/rec.boats
  #7   Report Post  
Clams Canino
 
Posts: n/a
Default Trouble shooting Mercury 1882 150 V-6

Don't you have any friends - with Mercs?

LOL

-W


"Bob La Londe" wrote in message
news:bevmna$9bk0e$1@ID-


I stopped by the local parts shop to get a gas can, and we got to talking
about the symptoms. I think I may just have a pinhole getting bigger in

my
fuel pump diaphram. The rebuild kit is less than $10 so I went ahead and
ordered one. Should be here in a couple days. Its real easy to check

too.
I can try it with an electric pump temporarily and see what happens.

I'll keep you guys posted. Thanks for all the help.


--
Bob La Londe
Yuma, Az
http://yumabassman.4t.com




  #8   Report Post  
Bob La Londe
 
Posts: n/a
Default Trouble shooting Mercury 1882 150 V-6

Heck, my dad probably has a half dozen gas cans I could have borrowed, but
I'm a do it now kinda guy and he lives 70miles away. Hell, he has a couple
motors I could probably borrow.

Besides I'm gonna want to have a couple 6 gallon tanks anyway when I get
around to putting my 50HP force on my little skiff.

Oh, you meant THOSE kind of friends. No I like all my friends better than
that. LOL


--
Bob La Londe
Yuma, Az
http://yumabassman.4t.com


"Clams Canino" wrote in message
news:rjJQa.62961$N7.8127@sccrnsc03...
Don't you have any friends - with Mercs?

LOL

-W


"Bob La Londe" wrote in message
news:bevmna$9bk0e$1@ID-


I stopped by the local parts shop to get a gas can, and we got to

talking
about the symptoms. I think I may just have a pinhole getting bigger in

my
fuel pump diaphram. The rebuild kit is less than $10 so I went ahead

and
ordered one. Should be here in a couple days. Its real easy to check

too.
I can try it with an electric pump temporarily and see what happens.

I'll keep you guys posted. Thanks for all the help.


--
Bob La Londe
Yuma, Az
http://yumabassman.4t.com






  #9   Report Post  
Bob La Londe
 
Posts: n/a
Default Trouble shooting Mercury 1882 150 V-6

Well, haven't gotten it out on the water, but I did find two or three
possible problems.

I'm not certain that there was water in the fuel, but the boat HAD the old
style open vents, and that boat takes a pretty big wave over the back deck
if I come off plane to quickly. I replaced one vent so far with a new style
vent that is not supposed to take in water unless you forced it in under
pressure. I'll replace the vent on the other tank if I have time tommorrow.

I added a Racor 2 micron filter and water seperator. Just in priming the
filter witrh the prime pump I noticed a little garbage in the bowl.

I tore down the fuel pump because a couple times it just sounded like it was
running out of gas. I couldn't find any pinholes in the diaphram. Not even
holding it up directly to the son. I did find somethign interesting though.
The diagram return plunger was just floating around in the valve chamber of
the pump. The spirng that pushes it out to push back the diaphram was
missing and the plunger could easily have been obstructing the flow through
one of the valves since the spring is supposed to hold it in place. I
ordered a spring from Alsco Marine along with a couple other parts for the
cowling. In the mean time I put the pump back together with out it. It
pumps gas just fine so tommorrow.

Ok, now for the driveway test. I ran it up to 4000 RPM in the driveway and
it nevered reved like it was running out of gas, and it never died or
spluttered. I ran it for a couple minutes at 1000, 2000, 3000, and 4000
rpm. It seemed to run great. I know that isn't the same as running under
load, but it didn't run well even at 3000 rpm before.

I might have some time to take it out and run it tommorrow afternoon if that
storm that's coming in tonight blows through.


--
Bob La Londe
Yuma, Az
http://yumabassman.4t.com



"Bob La Londe" wrote in message
...
Heck, my dad probably has a half dozen gas cans I could have borrowed, but
I'm a do it now kinda guy and he lives 70miles away. Hell, he has a

couple
motors I could probably borrow.

Besides I'm gonna want to have a couple 6 gallon tanks anyway when I get
around to putting my 50HP force on my little skiff.

Oh, you meant THOSE kind of friends. No I like all my friends better than
that. LOL


--
Bob La Londe
Yuma, Az
http://yumabassman.4t.com


"Clams Canino" wrote in message
news:rjJQa.62961$N7.8127@sccrnsc03...
Don't you have any friends - with Mercs?

LOL

-W


"Bob La Londe" wrote in message
news:bevmna$9bk0e$1@ID-


I stopped by the local parts shop to get a gas can, and we got to

talking
about the symptoms. I think I may just have a pinhole getting bigger

in
my
fuel pump diaphram. The rebuild kit is less than $10 so I went ahead

and
ordered one. Should be here in a couple days. Its real easy to check

too.
I can try it with an electric pump temporarily and see what happens.

I'll keep you guys posted. Thanks for all the help.


--
Bob La Londe
Yuma, Az
http://yumabassman.4t.com








  #10   Report Post  
noah
 
Posts: n/a
Default Trouble shooting Mercury 1882 150 V-6

On Thu, 17 Jul 2003 20:41:50 -0700, "Bob La Londe"
wrote:

Well, haven't gotten it out on the water, but I did find two or three
possible problems.

I'm not certain that there was water in the fuel, but the boat HAD the old
style open vents, and that boat takes a pretty big wave over the back deck
if I come off plane to quickly. I replaced one vent so far with a new style
vent that is not supposed to take in water unless you forced it in under
pressure. I'll replace the vent on the other tank if I have time tommorrow.

I added a Racor 2 micron filter and water seperator. Just in priming the
filter witrh the prime pump I noticed a little garbage in the bowl.

I tore down the fuel pump because a couple times it just sounded like it was
running out of gas. I couldn't find any pinholes in the diaphram. Not even
holding it up directly to the son. I did find somethign interesting though.
The diagram return plunger was just floating around in the valve chamber of
the pump. The spirng that pushes it out to push back the diaphram was
missing and the plunger could easily have been obstructing the flow through
one of the valves since the spring is supposed to hold it in place. I
ordered a spring from Alsco Marine along with a couple other parts for the
cowling. In the mean time I put the pump back together with out it. It
pumps gas just fine so tommorrow.

Ok, now for the driveway test. I ran it up to 4000 RPM in the driveway and
it nevered reved like it was running out of gas, and it never died or
spluttered. I ran it for a couple minutes at 1000, 2000, 3000, and 4000
rpm. It seemed to run great. I know that isn't the same as running under
load, but it didn't run well even at 3000 rpm before.

I might have some time to take it out and run it tommorrow afternoon if that
storm that's coming in tonight blows through.


....sounds like progress. )
Good luck.
noah

Courtesy of Lee Yeaton,
See the boats of rec.boats
www.TheBayGuide.com/rec.boats
Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT +1. The time now is 01:50 PM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 BoatBanter.com.
The comments are property of their posters.
 

About Us

"It's about Boats"

 

Copyright © 2017