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Author Topic: new here engine just dies  (Read 4163 times)

August 29, 2006, 07:20:34 PM
Reply #15

JimCt

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« Reply #15 on: August 29, 2006, 07:20:34 PM »
Did you run the engine yet?
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JimCT
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\'74 22-2 inboard
HIN:ASPL0953M74J
Chrysler 318
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\'74 Marshall 22
August 30, 2006, 12:33:50 AM
Reply #16

Jondsheeler

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« Reply #16 on: August 30, 2006, 12:33:50 AM »
Finaly got it to the lake. Started right up. Gave it a min to warm up. Ran fine unti I put it into gear then it died. Pulled the plugs ran a comresion test and found the top two to be at 110 psi and the bottom two at 72 psi   :(  . TMD said the lower carb sounds like its running to lean.  Does that sounds right? I'll pull the heads next week to get a look at the cylnderds and then it looks like it will need rebuilt  :cry:  . I really don't think I'm going to go that route though. I think I will just repower, I've been wanting to do that anyways.

Jon
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87, 170 w 90hp
August 30, 2006, 05:33:30 AM
Reply #17

RickK

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« Reply #17 on: August 30, 2006, 05:33:30 AM »
Kinda makes you wonder what they rebuilt 15 hours ago  :?: This is bizarre - if it's just been rebuilt, what happened to the lower cylinders?
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Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha
August 30, 2006, 08:15:29 AM
Reply #18

JimCt

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« Reply #18 on: August 30, 2006, 08:15:29 AM »
Compression test not good news.  Doing the carbs will get you through the rest of the season 'til you find a replacement.

Debris in the carbs can cause you a rich condition at idle by not allowing the float valves to close and a lean condition at higher RPM's because of plugged jets.  If the high speed jets are plugged or aren't feeding enough fuel to the two bottom cylinders they will not receive enough lube.  If that's the case, the cylinder walls are scored.  My guess is that the two low compression cylinders share the same carb.
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JimCT
------
\'74 22-2 inboard
HIN:ASPL0953M74J
Chrysler 318
------
\'74 Marshall 22
August 30, 2006, 08:22:24 AM
Reply #19

jdupree

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« Reply #19 on: August 30, 2006, 08:22:24 AM »
I think Jim is right on.  Just for the heck of it I would try a good de-carb on the motor.  The damage might already be done, but it might raise compression a bit and help the motor last.
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John L. Dupree, III
1999 Aquasport 245 Explorer - 225 Johnson Ocean Pro
AQABLA84E999
Member #257
August 30, 2006, 08:31:36 AM
Reply #20

JimCt

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« Reply #20 on: August 30, 2006, 08:31:36 AM »
De-carb won't hurt but it won't address the bad carbs.  If it were my engine I wouldn't even attempt to start it even to de-carb it until the carb kits were done.
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JimCT
------
\'74 22-2 inboard
HIN:ASPL0953M74J
Chrysler 318
------
\'74 Marshall 22
August 30, 2006, 09:41:44 PM
Reply #21

Jondsheeler

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« Reply #21 on: August 30, 2006, 09:41:44 PM »
After the past two months of owening my first boat I've learned alot. I would now ask the same ?.  What was actualy rebuilt? The carbs are spotless, would you still do a decarb? I'm pulling the heads next week to get a good look. If its real bad I'll repower. If I'm lucky I'll replace some rings and rebuild the carbs. I'm willing to bet I'll be repowering. On the bright side the Tech College down the street has a marine motor degree and I found out I can take it to them and they will fix it if I pay for the parts. Sounds scary but might be worth it.

Jon
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87, 170 w 90hp
August 31, 2006, 05:29:52 AM
Reply #22

RickK

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« Reply #22 on: August 31, 2006, 05:29:52 AM »
I taught at a Tech School for about 10 years and they had a marine  course that repaired too.  Seemed like a great deal if you're willing to wait - could be a semester or so.  Not bad if you have to pull the boat for the winter anyway.
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Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha
September 15, 2006, 03:12:12 PM
Reply #23

darkdealer

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« Reply #23 on: September 15, 2006, 03:12:12 PM »
so what's the story?????
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1988 170 AS Osprey
September 28, 2006, 12:49:30 PM
Reply #24

jdupree

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« Reply #24 on: September 28, 2006, 12:49:30 PM »
Jon,

What was the end result?
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John L. Dupree, III
1999 Aquasport 245 Explorer - 225 Johnson Ocean Pro
AQABLA84E999
Member #257
October 08, 2006, 08:44:47 PM
Reply #25

John Jones

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« Reply #25 on: October 08, 2006, 08:44:47 PM »
Quote from: "Jondsheeler"
After the past two months of owening my first boat I've learned alot. I would now ask the same ?.  What was actualy rebuilt? The carbs are spotless, would you still do a decarb? I'm pulling the heads next week to get a good look. If its real bad I'll repower. If I'm lucky I'll replace some rings and rebuild the carbs. I'm willing to bet I'll be repowering. On the bright side the Tech College down the street has a marine motor degree and I found out I can take it to them and they will fix it if I pay for the parts. Sounds scary but might be worth it.

Jon


"Decarb" has nothing to do with carburators.  It is the removal of carbon deposits from the piston groves and combustion chamber.
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