Quote:
Originally Posted by tyl604
Tango - are you talking about the green damper just above the VCV? See pic. If not, can you point it out?
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No. The check valve is in the nipple where the metal vacuum line attaches to the vacuum pump.
http://catalog.peachparts.com/ShopByVehicle.epc?q=1982-Mercedes--Benz-300d-Diesel--Injection&yearid=1982%40%401982&makeid=63%40%40MERCEDES+BENZ%40%40X&modelid=6190%3AED%7C10000135%3AMBC%7C1504%40%40300D&catid=240706%40%40Diesel+Injection&subcatid=240735@@Vacuum+Pump+Check+Valve&mode=PD
The plate that retains the valve tends to rust and break. That causes the valve spring and plunger to drop into the pump intake port. The parts then rattle around, intermittently blocking air flow.