Timing Cover: Service and Repair

NOTES: The timing case covers of engines 116 and 117 are distinguished by casting number and height.

Two through-holes each for the heater return (1) and the coolant supply (2) are arranged on the timing case cover. These are sealed at the crankcase by means of rubber sealing rings.

Because of the modified hole pattern for the water pump, the timing case covers cannot be used on cast iron engines.





The thread (arrow) for the temperature switch (turbocharged engines only) has been modified from M 16 x 1.5 to M 14 x 1.5 at the timing case cover of engines without oil cooler.

The timing case cover can be removed with the cylinder heads in place. Ensure that the cylinder head gasket is not damaged when performing this step.

As of April 1985 the position of the larger HT distributor in the timing case cover of engines with the electronic ignition system (EZL) has been modified.

Removal
1 Disconnect ground strap from battery.
2 Drain engine oil and coolant.
3 Remove radiator, fan cover and viscofan.
4 Remove alternator with bracket
5 Remove distributor.
6 Remove power steering pump with pipes connected and set aside.
7 Remove V-belt pulley together with vibration damper and hub. Service and Repair

Crankshaft arrangement 2nd version:

1 V-belt pulley
2 Bolt M 8 x 22
3 Vibration damper
4 Bolt M 18 x 1.5 x 45
5 Diaphragm springs (4)
6 Hub
7 Radial sealing ring
8 Woodruff key
9 Timing case cover
10 Crankshaft sprocket
11 Crankshaft

8 Remove coolant pump. Service and Repair
9 Unscrew warming-up regulator.
10 Remove oil pump. Service and Repair
11 Loosen oil pan upper part (with two-piece oil pan) on crankcase, i.e. back out screws approx. 3-4 turns.
12 Drive out oil dipstick guide tube.





13 Unscrew cylinder head bolts M 8 (arrows).





14 Disconnect TDC transmitter and remove.
15 Screw out all bolts for timing case cover.
16 Force out crankshaft oil seal.
17 Take off timing case cover and remove oil pump chain from crankshaft sprocket.

CAUTION: Do not damage cylinder head gaskets.

Installation
18 Renew O-rings for sealing of water galleries.





NOTE: If the bearing bushes are replaced, pay attention to position of oil groove at bottom (arrows).

19 Coat sealing surface of timing case cover with sealant 002 987 00 20.
20 Grease cylinder head gaskets.
21 When fitting the timing case cover, install the oil pump chain on the crankshaft sprocket by means of a bent piece of sheet metal.
22 First install cylinder head bolts M 8.
23 For further installation proceed vice versa to sequence of removal.