Mack E7, Service Manual

Page: 121 / 303

200 BENCH PROCEDURES
Page 5-31
INSPECTION
Worn valve guides may result in poor valve-to-
seat contact, valve damage or oil consumption.
1. Inspect valve guides for wear, damage,
cracks and looseness.
Refer to Figure 5-35.
2. Use a small bore gauge (1) to obtain an
accurate valve guide bore (2) measurement.
Figure 5-35 — Measuring Valve Guide Bore
Refer to Figure 5-36.
3. Use a depth gauge to check valve guide
extension.
Figure 5-36 — Checking Valve Guide Extension
When reconditioning the cylinder head, it is
recommended that all valve guides be replaced.
VALVE GUIDE REMOVAL
Clean exhaust valve guide OD (shoulder) before
removal. Use a rotary brush to prevent scoring of
exhaust valve guide bore.
Refer to Figure 5-37.
1. Insert valve guide remover J 37482 (1) into
valve guide from deck side of the cylinder
head (2).
1. Bore gauge 2. Valve guide bore
200294a
2
1
5-101.bk Page 31 Friday, March 17, 2006 11:05 AM