Mack E7 Service Manual page 116

5-101.bk Page 26 Friday, March 17, 2006 11:05 AM
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.
Part Number Description
446GC328 Valve Stem
Seal
714GB3103 Valve Guide
Page 5-26
200 BENCH PROCEDURES
Figure 5-26 — New Valve Stem Seal
Replaces
446GC296
714GB222
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.