Problem with Motor Overheating

G

GaryLStubbs

Recruit
Joined
Aug 22, 2009
Messages
2
I have a 1983 150 Mariner. The heads have just been replaced, the thermostat has been replaced, the waterpump has been replaced and the alarm still goes off after running for a few minutes. Any suggestions as to what the problem may be?
 
G

GaryLStubbs

Recruit
Joined
Aug 22, 2009
Messages
2
Re: Problem with Motor Overheating

Another question - is it possible there is a short somewhere and how would I go about locating it. The mechanic I have been using seems very competent, but so far he's been unable to pin down the problem. He went with the obvious at first - thermostat and water pump and from there to the heads. Any ideas on what it could be. I just got it back this weekend and within five minutes of running the alarm sounded. I would take it down to an idle for a few and the alarm would subside. As soon as I rev it back up the alarm would sound. Looking for any suggestions on what to check. Thanks
 
corm

corm

Lieutenant Junior Grade
Joined
May 12, 2000
Messages
1,241
Re: Problem with Motor Overheating

Hi,

If the engine is not hot then the sensor may be bad.
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,142
Re: Problem with Motor Overheating

As Corm said, put your hand on the block. Those motors normally run about 140*, and you can hold your hand on the head for several seconds. If it is overheating, check the poppit valve (lower starboard side of block). The other alternative is maybe a piece of the old impeller clogged the water tube. Drop the LU and stick a hose in the thermostat hole and maybe it will clear out.
 
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