Valve Guide Seal: Service and Repair

1 Camshaft
2 Rocker arm
3 Hydraulic valve clearance compensating element
4 Cylinder head
5 Valve guide
6 Exhaust valve
7 Valve seat ring
8 Thrust piece
9 Valve spring retainer
10 Valve cone half
11 Outer valve spring
12 Inner valve spring
13 Valve stem seal
14 Rotocap


NOTE: The valve stem seals including assembly sleeves are supplied in repair kit form.

Valve guides which are worn at the retaining groove for valve stem seal must be replaced.

CAUTION: Rocker arms, thrust pieces, valve spring retainers, valve springs, valve cone halves and Rotocaps must be reinstalled in the same position in order to ensure that the basic position of the hydraulic compensating element is not changed.

The valve stem seals are supplied as spare part in two versions. They must be allocated to the appropriate valve guide to avoid oil leaks.


1st Version:





A Exhaust
B Intake

Valve stem seal 116 053 00 58 with flat, brass-colored retaining spring (arrow).
Use 1st version only for valve guide without stop collar, 5.2 mm retaining groove distance.

1st Production Breakpoint (1st Version):
From start of series production (February 1982) until February 1983 and as of June 1983 up to November 1983

Up to engine No.
116.962 12 015193
116.963 12 028837
117.962 12 001972
117.963 12 023645

2nd Production Breakpoint (1st Version):
June to November 1983

Engine No.
116.962 12 018054-023705
116.963 12 033750-042895
117.962 12 002310-003139
117.963 12 028416-039773


2nd Version:





A Exhaust
B Intake

Valve stem seal 110063 02 56 with found, brass colored retaining spring (arrow).
Use 2nd version only for valve guide with stop collar and with 3.3 mm retaining groove distance.

1. Production Breakpoint (2nd Version):
February to May 1983
Engine No.
116.962 12 015194-018053
116.963 12 028838-033749
117.962 12 001973-002309
117.963 12 023646-028415

2. Production Breakpoint (2nd Version):
From November 1983
Engine No.
116.962 12 023706
116.963 12 042896
117.962 12 003140
117.963 12 039774


Replacement:
1 Remove valve springs. Service and Repair
2 Remove valve stem seals with a screwdriver or with a pair of pliers.

CAUTION: Do not damage valve stem and valve guide.





3 Deburr valve stem groove.
Replace worn valve cone halves and spring retainers.
4 Check Rotocap and replace if required.
5 Lubricate valve stem seals and install.
Use installation mandrel.
6 Install valve springs. Service and Repair





1 Thrust piece
2 Valve cone halves
3 Valve spring retainer
4 Outer valve Spring
5 Inner valve spring
6 Rotocap
7 Vale stem seal
8 Locking ring
9 Valve guide intake
10 Valve guide exhaust
11 Intake valve
12 Exhaust valve
13 Rocker arm
14 Hydraulic valve clearance compensating element