Oil Pump: Service and Repair

NOTE: During oil pump change, ensure uniform number of teeth on drive gear. If clamp for drive chain must be renewed. remove timing case cover. Service and Repair
Important: Fill oil pump with oil before installing!





The oil pump compensation piece version "B" was installed as standard from November to December 1982, and must be replaced with version "A" in the case of repairs.
Hardened oil pump compensation pieces must be renewed.
From October 1985, an oil level transmitter has been screwed to the oil pump. The plug connection of the electric line of the oil level transmitter passes through right-hand crankcase wall from inside to the outside and must be sealed with a sealing ring.


Removal:





2 Connection plug
3 Oil level transmitter

1 Drain engine oil.
2 On model 107 remove oil pan.
On model 126 remove oil pan lower part.
3 Place compensation weight of first crank pin in horizontal position.





Model 107
4 Unscrew fastening screws (1, 2 and 3). tilt oil pump forward, remove drive chain from drive sprocket and remove oil pump.

Model 126
5 Unscrew screws (1,2 and 3).
6 Loosen screw (4) on drive sprocket, tilt oil pump toward the rear and remove the screw.
7 Push drive sprocket away from oil pump by means of a screwdriver and remove oil pump.
8 Lift drive sprocket out of drive chain.


Installation:





Model 107
9 With oil pump tilted forward, place drive chain on drive sprocket, screw in fastening screws (1, 2 and 3) and tighten to 25 Nm.





Model 126
10 Engage drive sprocket in drive chain.
11 Push oil pump onto drive sprocket. The dowel sleeve in the drive sprocket should enter the recess in the drive shaft (arrows).
12 Tilt oil pump to the rear, screw in screw (4) and tighten to 28 Nm.
13 Screw in fastening screws (1, 2 and 3) and tighten to 25 Nm.

CAUTION: Prevent tensioning spring (5) of tensioning bar (6) from turning by holding with a screwdriver when tightening the bolt (1).

All Models
14 Install oil pan or oil pan lower part with new gasket and tighten fastening screws to 10 Nm (thread M6) or 25 Nm (thread M8).
15 Fill in engine oil.
16 Run engine, check oil pressure, check for leaks.
17 Check oil level and correct if required.