8. CYLINDER HEAD/VALVES MXU 500 IRS
Rocker Arms
ROCKER ARMS
REMOVAL/INSPECTION/
INSTALLATION
REMOVAL
Remove the camshafts (refer to the
"CAMSHAFT REMOVAL/INSPECTION/
INSTALLATION" section in this chapter).
Remove the rocker arm shafts and washers,
then remove the rocker arms.
Rocker Arm Shafts/Washers
INSPECTION
Rocker Arm Shaft
Rocker arm shaft
Inspect the rocker arm shaft for blue
discoloration or grooves.
If any defects are found, replace the rocker
arm shaft with a new one, then inspect
lubrication system.
Measure each rocker arm shaft O.D.
Measure the I.D. of each rocker arm.
Measure arm to shaft clearance.
Replace as a set if out of specification.
Service limits: 0.1 mm
Inspect the rocker arm bore, cam lobe contact Rock Arm
surface and adjuster surface for
wear/pitting/scratches/blue discoloration.
If any defects are found, replace the rocker
arm shaft with a new one, then inspect
lubrication system.
Measure each rocker arm shaft O.D.
Measure the I.D. of each rocker arm.
Measure arm to shaft clearance.
Replace as a set if out of specification.
Service limits: 0.1 mm
8-15
RAS 
4.7 / 5