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Volvo Penta

I have a motor Volvo Penta AQD 41A in my boat, and now I have a problem that I don't get to identify. - The motor usually works, meantime after some hours of use, it expels the whole lubricating oil through the breath filter. I made the test of compression emission opening the cover where the oil is put, and I didn't notice any compression emission. I would like somebody to guide myself to I respect, because several mechanics that I consulted myself didn't give a satisfactory answer. The apparent causes would be rest in the pistons, but that is not true because the motor is not with the level of the low oil. Thanks Fernando

Reply to
Fernando
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I had this some years ago and it was due to worn bores/piston rings. When the engine is 'cold' say on a short run the viscosity of the oil in the sump was high enough to resist the pressure leaking past the pistons and was not blown out of the crankcase breather. If used on a long run then the oil would get blown out and this would happen over a small rise in oil temperature. The apparent performance of the engine did not seem to be affected. It worth noting that small rises in temp (20C)can reduce the viscosity of oil by half The cure was rebore and new pistons. It would be worth checking that if you have bought this engine second hand, that all the pistons have all their rings, as I have seen engines with the rings missing altogether.

Reply to
Alistair Ross

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