Mercedes 814d van with very oily air filter

Gypsy

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My campers got the OM364 LA engine (thats the non electronic engine fitted before the VARIO model); a considerable amount engine oil seems to be coming from the brake vacuum pump exhaust pipe that's connected to the air filter housing. In a very short time the air filter is drenched in oil.

The brakes seem to be working fine.

The brake vacuum pump is a piston type and is run off the crankshaft. I've dismantled the pump, the bore and the rings on the piston seem to be OK (however I'm no expert and have no workshop manual to guide me).

Anyone else know of this problem, any advice would be appreciated
 

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