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Old 10-25-2014, 12:14 AM   #11
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Which of these plugs was from cylinder 1 that had the lower compression?

Most look like the engine is running lean, white.

What color is the smoke at start up? Blue is oil, black is rich gas, and white is water.
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Old 10-25-2014, 12:11 PM   #12
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Mike, I did the leak down test yesterday. Cyl #1 had a leaking intake valve and that's perfect explanation why compression on this cylinder was lower. Compression on all the other cylinders was extremely high which made me thinking. I believe that either valve guides or seals are leaking oil to the point that It cumulates inside inside the combustion chamber and seals the rings. Basically it's the same if I'll be doing wet test and that's why those readings are high for this engine. That also explains oil on the spark plugs tread. Does it make sense?
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Old 10-25-2014, 12:43 PM   #13
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Oil leaking down the valve stems will result in the plugs getting oil soaked for the portion that is inside the combustion chamber. Also yes this will cause the compression to be higher.

Been thinking those plugs look strange, white electrodes as is running lean but gray else where. They look as if they have lots of hours but are suspose to be new but I guess oil buring will cause that.

With that said I still find it hard to believe that 1 quart would leak out in 5 hours through these means additionally you stated no blue smoke when running and no oil in the bilge.

Did the mechanic do all the work? remove/install heads?

Is this guy a boat mechanic, merc certified?
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Old 10-25-2014, 02:29 PM   #14
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Mechanic which removed the head is marine mechanic not sure if certified by mercruiser. He remove the heads and gave them to other head guy who machine the heads and installed new valves. It looks like a head guy dropped the ball. I do get white/blue smoke at the start up. I thought that carburetor is responsible for that but I might be wrong about it and it might be caused by oil. No smoke during driving. Spark plugs got less then 30 hours on them and they were installed new when doing heads. Its painfull since the guy is 47 nm away from my home port.
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Old 10-25-2014, 03:07 PM   #15
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So the marine mechanic pick the head guy and also reinstalled the heads, correct? And now does not want to standby his work, verify the issue is not due to his work?
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Old 10-26-2014, 01:11 PM   #16
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Mike, I feel the same way about it. He should be responsible for entire job. Just wanted to make sure that I got enough good arguments to show him where the problem is and don't get send back with some silly explanation from him. I called him yesterday and he will speak with the head guy on monday. I'm planning to drop of the boat with him on tuesday.
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Old 10-26-2014, 02:01 PM   #17
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Hopefully they come to a solution that satisfies you. Best of luck.
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Old 10-26-2014, 02:34 PM   #18
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Thank you! Will keep you posted.
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