Oil Filter: Service and Repair

NOTE: When removing oil filter, residue from gasket may remain stuck to flange surface of cylinder crankcase.


To prevent such residue from entering the clean oil duct (arrow) of cylinder crankcase during removal (e.g. by scraping), make sure to cover or close bores first.

Residue from gasket dropping into clean oil duct may be flushed by the oil to the oil spray nozzles and plug the bore (1.5 mm dia.) there.

A plugged oil spray nozzle will definitely result in engine damage (seized pistons).






A 1st version
B 2nd version

The quality of the studs has been changed from 10.9 to 12.9 and the screw-in depth in oil filter housing extended from 16 mm to 24 mm (B).

The nuts were also adapted to the strength classification of the studs.

The modified studs are recognized by the pin (arrow) machined at their ends, the oil filter housing by the longer threaded eyes (a).

These modified studs cannot be screwed into previous oil filters.

The part number of the complete oil filter has not been changed.






Spare part

Production breakpoint

Engine Month/Year
617.91/95 approx. 4/82

From August to November 1984 the gasket for oil filter crankcase and cover on oil filter were made of a material more resistant to swelling.






Installation: August - November 1984


Removal





1 Unscrew oil filter cover (cap) and pull up for a short distance so that the oil flows back to oil pan.






Models 116 and 123
(engines 617.950/952)

2 Unscrew oil cooler lines (arrows).
3 Unscrew line toward oil pressure gage on oil filter of models 116 and 123 (arrow).






Model 126
(engine 617.951)

On model 126 pull off single plug connection (1) of electric line toward oil pressure gage on oil pressure transmitter (2).






Models 116 and 123
(engines 617.950/952)

4 Unscrew oil feed line (3) toward exhaust gas turbocharger on oil filter (arrow).






Model 126
(engine 617.951)

5 Unscrew oil filter (5 hex. socket screws) and remove.
6 Thoroughly clean sealing surfaces on oil filter and cylinder crankcase.

For this purpose, close bores on cylinder crankcase.

Installation
7 Position oil filter with new gasket and screw down.
8 Screw on oil cooler lines.
9 Connect lines toward oil pressure gage on oil filter or on oil pressure transmitter.
10 Screw on oil feed line for exhaust gas turbocharger on oil filter.
11 Mount oil filter cover (cap) and screw down.
12 Run engine at idle and check for leaks.