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Hi, people.
Bill Arthur, are You serious ?
1." Carbon build up is common in manifolds during low load running, due to gas byepass from the pistons,as they are not at their correct operating temp. due to expansion."
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2." Low load running can be seen normally by exhaust gases from the funnel/exhaust system being of an oily nature."
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3. "it was evident of carbon build up of both exhaust and inlet manifold,,,,heavy carbon deposits around the valve guide area also."
I think, this sentence explains a lot...., especially how oil can get into oil in inlet manifold. :-)
A few questions:
1. Was crankcase ventilation ok ?
2. Have You ever performed "comb. chamber leak test" ?
3. Was oil level ok ? (May be higher than max. ?)
4. Some engines have a turbo, which is lubricated and cooled by system oil, so, there are some oil seals in turbos...
5. What was ER ambient pressure ?
6. Your engines running MGO/MDO or HFO ?
7. Piston rings were ok ? Liners ovality was in range ?
8. What were rhrs since last overhaul ?
Interesting, interesting .....
rgds,
Andrei
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