Mack Trucks — 5-101.bk

5-101.bk Page 26 Friday, March 17, 2006 11:05 AM Figure 5-26 — New Valve Stem Seal This new seal is recommended for all E7 engines. The single lip seal has been terminated, and as service stock is depleted, only the new seal will be available. This new seal can be used on the old-style valve guides. Refer to Figure 5-27. 4. With valve spring keepers (1) removed, remove upper washer (2), valve spring (3), oil seal (4), lower washer (Roto-Coil) (5) and valve (6). After removing the valve springs, removal of the existing valve stem seals can be accomplished easily and quickly by using the J 39460 Valve Stem Seal Removal tool.

Failure to use this tool could make seal removal more difficult, and could result in damaging the outside diameter of the valve guides. Page 5-26 200 BENCH PROCEDURES Part Number Description Replaces 446GC328 Valve Stem Seal 446GC296 714GB3103 Valve Guide 714GB222