oil pressure

H

haeusermann

Recruit
Joined
Sep 11, 2004
Messages
5
I have a thundercraft 29' with two Mercruiser 4.3 LX (1989). Since a while, I have an intermittent low pressure problem on my left engine. The problem occurs when the engine is hot after running a while at cruising speed. My gauge shows from 0 to 10 PSI. The engine is running well and I didn't notice a particular sound or a loss of performance. My oil level is normal and the oil/filter were changed in June 2005.<br /><br />At this time, I've done a few things to try to solve the problem. First I put a mechanic gauge on the engine and try it for half an hour. The pressure was stable between 35 and 30 PSI. I decided to change de sender. It was going well for a while but the problem is starting again.<br /><br />When the pressure is low , I tried to stop the engine and to only turn the key (ignition). The needle doesn't come up to 0. I did the same test when the pressure is normal and the needle goes up to 0.<br /><br />What should I do?? :confused:
 
W

waterone1@aol.com

Lieutenant Junior Grade
Joined
Oct 10, 2004
Messages
1,235
Re: oil pressure

That sounds like either a wiring problem at the gauge, or the gauge itself. Check all connections on the back of the gauge. If you don't find anything, swap the two oil gauges and see if the problem stays with that gauge. If so, replace the bad gauge.
 
S

seapack

Cadet
Joined
Jun 27, 2005
Messages
6
Re: oil pressure

I had a similiar problem with my starboard engine. (Mercruiser 5.7) The engine ran normally but the pressure slowly dropped. After a thorough inspection I discovered an oil leak around the oil pressure sender. After resealing the sender and replacing the hoses for the remot oil filter which also had slight leaks the pressure returned to normal.
 
W

waterone1@aol.com

Lieutenant Junior Grade
Joined
Oct 10, 2004
Messages
1,235
Re: oil pressure

I think the key to solving this is that gauge does not go to zero when you turn on the ignition switch (when it is acting up). To me, that sounds like wiring or gauge itself.
 
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