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Old 09-09-2021, 06:30 AM
ArtJ ArtJ is online now
 
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Engine Overheat Question

A couple of days ago while attempting to sail a narrow main harbor entrance
against strong wind and current I started the engine as well as sails up.
I ran at 1500 rpm for at least 10 minutes without realizing that the s/w input valve was in the off position. My engine is a late model direct drive with fresh water cooling newer pumps and impellers.
Due to the exhaust exiting the side I did not notice that the engine was not cooling until I saw white steam at the stern.
The boat is a Tartan 34 with new standpipe and ss exhaust well wrapped.

The temp was pegged beyond 220. I immediately went below and opened
the s/w inlet valve.
The temp dropped to 180 in a few minutes.

I listened for noises and thought I heard a low pitched thud knocking noise under load
at around 1900 rpm and above as a test, Normally I don't run engine
that high of rpm unless urgently need high speed.
with a clean bottom and calm seas can do 5-6 knots at 1500 t0 1600 rom.
What symptoms can I check for to ensure no damage occurred?
Should I replace the still working s/w impeller?
Not sure how to distinguish normal engine and prop noise from
symptoms of damage. I always maintain the engine regularly and oil was full.
Engine with Indigo prop normally becomes quite a bit noisy when rpm exceeds
1900 rpm. I am not talking about normal valve chattering.
May be no problem but would like to know what checks and noises
to watch out for .
When back on the mooring, I ran the engine in neutral at higher rpm and did not hear any noises then, maybe only when under load?

Thanks Art

Last edited by ArtJ; 09-09-2021 at 07:32 AM.
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