Offshoreonly.com - losing RPM's after running for a while

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hawk40

07-06-2004 09:47 AM

losing RPM's after running for a while

I'm lossing power on my port engine after running fairly hard for extended times. The RPM's start slipping off after running for about 20 minutes in the 4000 range. Just had the drive refurbished. The starboard engine runs strong the entire time. TRS drives, 454's carbed. Just bought the boat last October and never ran it hard before the drive was rebuilt. Any ideas? Is this caused by something setup wrong in the drive?

Jersey Tom

07-07-2004 07:51 PM

Re: losing RPM's after running for a while

fuel pump going bad? Filter?

fo-shizzle

07-09-2004 12:50 PM

Re: losing RPM's after running for a while

one more thing to check... oil level... if too high, over time the crankshaft will have a tendacy to aerate/foam the oil which then causes additional drag on the cranksaft as well as possibly causing the lash adjusters to bleed down....

cooltoys61

07-10-2004 12:32 PM

Re: losing RPM's after running for a while

make sure your timing is not to high and causing detonation after warmup. Won't last long that way though so prob not it.

WILDTHING TAZ

07-10-2004 09:28 PM

Re: losing RPM's after running for a while

check fuel flow, check fuel filter for water that will stop flow, check fuel pressure.

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