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What have you got to say about the topic of: "oil in water". Here's how is started: "I have a 89 merc 150 hp ,is it possible to be leaking combustion past "
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01-08-2007, 08:58 AM
| #1 | ||
| NBS Member Join Date: Sep 2006 Location: woodstock ct
Posts: 38
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I have a 89 merc 150 hp ,is it possible to be leaking combustion past a head gasket.or should i say is that a common problem with a outboard,being as old as it is.engine runs good but misses at idle.. thanks..
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01-08-2007, 08:57 PM
| #2 | ||
| NBS Member  Join Date: Jun 2006 Location: Westbrook CT
Posts: 1,318
| Do a compression test. That should tell you something. If your talking about oil in the water around the boat, aside from environmental issues that is faily normal for a motor of that vintage. But if it is missing at idle it could be signaling other problems. How much oil? | ||
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01-09-2007, 07:00 AM
| #3 | ||
| NBS Member Join Date: Sep 2006 Location: woodstock ct
Posts: 38
| I actually meant oil residue on the thermostate when i removed it ..I removed the heads and found what i think was a leak on the head gasket around the top cyl on right bank if you were standing in back of motor...
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01-09-2007, 09:47 PM
| #4 | ||
| Join Date: Aug 2006
Posts: 35
| I have seen this before on older mercs some mercs have disposable headbolts i am rebuilding 1 now with them check before you reassemble also your head probally needs to be milled is it pitted?? | ||
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01-10-2007, 09:19 AM
| #5 | ||
| NBS Member Join Date: Sep 2006 Location: woodstock ct
Posts: 38
| Yes there is some slight pitting,so i will send them out to have them checked..thanks for the input..
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