Omc 1.6 over heating

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Proline Boat

Recruit
Joined
Jun 12, 2003
Messages
3
I have a 1990 v4 1.6L. I have change the the thermostats to see if that would fix it. The water pump seams goods I get 10 to 15 psi at 2000 rpms. I can run the motor for 5 min and the left side cinder heads run right up to 175F. Today I removed the left side heads to look for any kind of blockage. I did not find any thing. There is a light coating of salt all over the cinlderwalls. I dont think its thick enough to stop heat transfer. Is there any place to find a water pasage diagrm. I also ran the motor with the thermostats out of it and had the same problem. Its only the left side cylinder heads that over heat too.
 
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echozulu

Seaman
Joined
Jun 12, 2003
Messages
69
Re: Omc 1.6 over heating

if you havent already rcheck the waterpump a water pressure gauge will show steam pressure as well its not taking long to get hot start with the basics first
 
P

Proline Boat

Recruit
Joined
Jun 12, 2003
Messages
3
Re: Omc 1.6 over heating

I dont think its that simple as the pump. The Water comes out like a garden hose out of the pee tube. I all most think the block is blocked some place. I was trying to not have to pull the whole power head to see where the water splits left and right.
 
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echozulu

Seaman
Joined
Jun 12, 2003
Messages
69
Re: Omc 1.6 over heating

when you pulled the heads did you also remove the water jacket covers on the heads ? how about the rubber water deflectors in the water jacket ?
 
P

Proline Boat

Recruit
Joined
Jun 12, 2003
Messages
3
Re: Omc 1.6 over heating

I wanted to take the water jacket covers off the head but some of the bolts dont want to move. I flused it with water then shot shop air in the head. I all most pulled the water defletors out. Then I was like humm they look too good to be just junk. I have though it might even be a carb problem. With the mix being to lean. I have no way to test how lean the mix is on that side of the motor. Thats what gets me its only the one side that over heats. I am just glad I have dule temp gages to spot the problem.
 
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