Page 80
TROUBLESHOOTING
6. Repeat the check on all other rocker arm
bushings.
ROCKER ARM ROLLER BUSHINGS
1. Using the flywheel turning tool, 9996956
(MP7) or 88800014 (MP8 and MP10), turn
the engine until the camshaft is in a position
where the rocker arm roller being checked is
on the base circle of the camshaft lobe.
2. Make sure there is clearance between the
rocker arm roller and the camshaft lobe.
To check the injector, the rocker arm roller must
be on the base circle of the camshaft lobe and
the injector adjusting screw backed off (preload
must be readjusted).
3. Rotate the roller a few turns so that the oil
film between the roller bushing and shaft is
forced out. If the roller jams, is sticky or
rough, the rocker arm should be replaced.
70
Figure 70 — Forcing Oil from Roller (Typical Rocker
Component Shown)
4. Place the dial indicator, 9989876, into the
magnetic stand, 9999696, and position the
magnetic stand as level as possible on the
rocker arm.
71
Figure 71 — Dial Indicator Positioning
5. Adjust the tip of the dial indicator so that it is
horizontal to the center of the roller. Zero the
dial indicator.
Check that the tip of the dial indicator is
pre-tensioned and can move in both directions.
To Next Page
Loading...
