944 S L4-2479cc 2.5L DOHC (1987)
Valve: All Technical Service Bulletins
Exhaust Valves/Stem Seals - Seized
Number
8909
Group
1
Model
944 Turbo
Part Identifier
1562/63
June 16, 1989
Subject:
Modified Exhaust Valves and Stem Seals
Prolonged high speed operation has caused seizing of exhaust valves in their guides in some countries other than the U.S. To reduce the possibility of
this occurring, exhaust valves with a conical stem (0.01 mm) and modified valve stem seals are installed in all 1988 model 944 Turbo S and 1989 model
944 Turbos including those for the U.S.
47 J 00529 - Exhaust valves
47 J 00777 - Valve stem seals
The new exhaust valve can be identified by PN 951 105 416 07 die stamped on the valve stem end. (Fig. 1)
The new version valve stem seal PN 951 104 195 01 can be recognized by a 45 degree chamfer on the sealing lip. (Fig. 2)
Repair Information