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From: (no name) (no email)
Date: Mon Jun 11 2007 - 10:09:42 EDT
In a message dated 6/11/07 12:00:56 AM, Dan writes:
> We are just outside of Atlantic City, going up the inside. The 6-354
> Perkins
> diesel has started to surge a bit. It has been eating some oil but wondered
> if
> anyone out there knew what could make it surge. Does not seem to be in a
> pattern but every so often surges about 100 RPM's then goes right back to
> where it was.
>
The usual suspect for engine surges is a clogged primary fuel filter. The
mechanism of surges seems to puzzle many boaters since the major effect of
clogged filters is to cause fuel starvation and slow the engine down. What happens
is that the clogged filter impedes fuel flow. You advance the throttle slightly
to keep the rpms up to normal for your cruising speed. Every once in a while
the lift pump pushes an additional blivet of fuel through the clog and the
engine speeds up for a few seconds, then slows down to the regular speed set by
the throttle. The surges will become more frequent until you change the filter.
Air leaks, and most of the other less usual suspects will tend to slow the
engine down rather than speed it up. A bad governer will produce erratic hunting
around the set speed. Replace the fuel filter(s) first. If that doesn't cure
the problem, go on to the other suspects.
Larry Z
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