Engine - Oil Filter Housing O-Ring Inspection

91mercedes04

REF. NO. MBNA 18/11a


TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS

DATE: June 1991 (supersedes MBNA 18/11, April 1991)


SUBJECT: ENGINES 602, 603 INSPECTION OF OIL FILTER O-RINGS


Note: This Service Information is revised to include an improved illustration.





During the next oil filter charge, the condition of the oil filter O-rings (1) in the stem of the filter housing lid should be checked. The O-rings prevent the oil in the filter housing from draining back into the pan once the engine is turned off. If one or both of the O-rings are damaged or hardened, they should both be replaced.

In case of the customer complaints regarding "Noisy engine during and after starting" (especially with a hot engine) which can be traced to noisy hydraulic valve tappets, check the condition of the O-rings before the tappets are replaced. If replacement of the O-rings does not eliminate the noise complaint, only then may additional repairs be performed.

Note: A momentary "ticking" noise after engine start-up is a normal operating condition.

Parts Information
Parts Name Part Number
O-ring 015 997 94 48