ENGINE SYSTEMS
53
3. DISASSEMBLY AND INSPECTION OF ENGINE MAIN PARTS
1) Rocker arm ass’y
Disassembly
(1) Remove the bolts of the rocker arm shaft and take
out the rocker arm, rocker arm bracket, spring and
shim.
(2) Extract the spring pin which has been driven into the
No. 1 cylinder rocker arm bracket and take out the
rocker arm, spring and bracket.
1. Rocker arm shaft
2. Rocker arm
3. Shim
Inspection and service
(1) Using a micrometer, check outside diameter of the
rocker arm shaft. If the shaft is worn exceeding
service limit, replace it with new one.
Wear of rocker arm shaft ø
Standard assembling value Service limit
11.65 – 11.668 Less than 11.57
(2) Measure the inside diameter of the rocker arm.
Calculate the clearance between the rocker arm and
rocker arm shaft. If the clearance is excessive,
replace the part.
Clearance between rocker arm and rocker arm shaft
(mm)
Standard assembling value Service limit
0.032 – 0.068 More than 0.2
6
7
8
★Cautions before start
1) Check the cylinder block and cylinder head for wear, leakage and damage.
2) Remove deposit in oil holes of each part with air and check for clogging.
3) Wash each part well to remove dust, contaminated oil, carbon, and other foreign matter.
4) Remove carbon deposite on the piston, cylinder head, valves, etc. carefully not to damage parts. (Great care
is necessary specifically for aluminum alloy parts.)
5) Valves, pistons, connecting rods, metals and other parts which are to be combined as specified should be
attached match marks beforehand to prevent confusion.
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