Volvo engines usually manage the crankcase pressure by breathing to the intake on these small engines. SOmetimes this is an external hose to the aircleaner however they have also utilized a system of direct breathing from the pushrod space to the inlet bore above the inlet valve.
If your engine has the latter then maybe the breathing valve is partially blocked or stuck....Vic is a dab hand for finding manuals....maybe we can check this however it might require the head to be removed
These systems can cope with quite worn engines so seems in your case it just isn't doing its job.
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Re: volvo penta 2001
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