140 CYLINDER HEAD AND VALVE TRAIN
Figure 186 Measuring valve spring tension
5. Use a Valve Spring Compressor (Table 17) to
measure the valve spring tension. Measure the
maximum and minimum lengths of the spring at
the appropriate test loads (valve closed and valve
open). Replace any valve spring that does not
meet valve spring specifications (Table 14).
Inspecting Valve Rotators
1. Clean all valve rotators in a suitable solvent.
Figure 187 Checking valve rotat
or
1. Ram
2. Steel ball bearing
3. Paint reference line
4. Spring
5. Valve rotator
2. Lubricate the valve rotator wit
h clean engine oil.
Place the valve spring and ro
tator in spring tester.
3. Place a ball bearing between t
he valve rotator and
the ram of the spring tester.
The ball bearing must
belargeenoughtopreventt
he ram from touching
any part of the rotator.
4. Paint a reference line on th
e valve rotator and
spring.
5. Compress the valve sprin
g rapidly with even
pressure and observe the
valve rotator as it turns.
Replace any valve rotat
or that does not turn.
EGES-265-2
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
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