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Cummins 370 power loss.
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Topic author - Deck Hand
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Cummins 370 power loss.
Runs very smooth, no smoke even under load at 1800 RPMs Motor will spool all the way up to 3000 RPMs in nuetral.
I have confirmed fuel tank is venting properly
I checked throttle cable travel and it matched the staboard engines
I replaced the engine fuel filter
The engine runs very smooth at all RPM ranges and does not smoke.
- mjk1040
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Re: Cummins 370 power loss.
I'd Rather Be Boating!
1989 Sea Ray Seville
1986 Carver Mariner 32'
1990's Thompson 22' Cuddy Cabin
1990's 4Winns 245 Vista Cruiser
1980's Thompson 19' Open Bow
- bud37
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Re: Cummins 370 power loss.
Post the year of your engines, may be a help for someone to diagnose for you.
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- CYO Supporter
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Re: Cummins 370 power loss.
Tomion wrote:Source of the post......I replaced the engine fuel filter......
I trust you mean the filter on the engine itself. Do you have primary fuel filters such as Racors before the engine? If so, have they been replaced and the assemblies cleaned?
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Topic author - Deck Hand
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Re: Cummins 370 power loss.
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- CYO Supporter
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Re: Cummins 370 power loss.
Tomion wrote:Source of the post........The Racor filters look clean thru glass bowl so I dont think it is dirty fuel issue.....
Sounds like a fuel delivery issue. The bowl might look clean but you may have a restricted filter if it hasn't been changed in a while.
Tomion wrote:Source of the post....... I beleive the only explanation beyond a shaft issue is a turbo but have been told engine would smoke a lot if this was the priblem.
Correct, not enough air for complete combustion to burn all the fuel.
Tomion wrote:Source of the post...... Now it maxs out at 1800 RPMs and boat cant get up on plane......Runs very smooth, no smoke even under load at 1800 RPMs Motor will spool all the way up to 3000 RPMs in nuetral......
Running it in neutral at 3000 rpm is not the same as running it in gear under load. BTW, it not a good idea to run an engine at that rpm in neutral.
Short of a fuel delivery problem, there aren't many other suspects except internal issues like poor compression.
- bud37
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Re: Cummins 370 power loss.
Tomion wrote:Source of the post The engines are 2001 mechanical fuel injection. The bottom was painted a year ago when they found the castle bearings were shot and they had worn groves in the shafts and they had to be replaced. I find it odd that it has gotten progressivley worse over the last year. There is no vibration, will check to see if I can turn shafts by hand. The Racor filters look clean thru glass bowl so I dont think it is dirty fuel issue. I beleive the only explanation beyond a shaft issue is a turbo but have been told engine would smoke a lot if this was the priblem.
I agree with Viper above there.....here is some additional info and a good read for you,I know it was for me; You may have come across this but nevertheless......
https://www.sbmar.com/articles/understa ... eshooting/
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Topic author - Deck Hand
- Posts: 53
- Joined: September 6th, 2014, 10:00 am
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Re: Cummins 370 power loss.
1- Shafts turn easily on both engines.
2- Transmission fluid levels good.
3- Mechanic pulled intake and exhaust sides of Turbo and found it to be free and in good condition.
4- Checked Racor filter, found to be clean.
5- returning next week to check fuel pressure
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Re: Cummins 370 power loss.
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- Deck Hand
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Re: Cummins 370 power loss.
Had an underpower issue with my starboard Cummins' 330. Like you, port ran fine, had clean running gear after a scrape, and engine ran fine in neutral. Under load, wouldn't go over 2K RPM (recommended max is 2.8K). Mechanic believed turbo was at fault - not kicking in properly.
Here's where I hope some gear heads will jump in. At lower RPMs, turbo acts fine ... at higher RPM (a 'second' boost phase from the turbo?) he spotted a leak in a hose (and here's where I lost him) ... used the words turbo and aftercooler. I have a operations manual, but I can't really tell what hose he might have been talking about - replaced. BUT - replace it he did and now things are rockin' and rollin' like they're supposed to - 21knts up on plane in a heart beat, both engines purring at 2.8K RPM.
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