Shibaura ST318, Руководство по ремонту

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2. DISASSEMBLY AND INSPECTION OF ENGINE MAIN PARTS
* 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.
1) Rocker arm ass’y
Disassembly
(1) Remove the bolts at both ends 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 bracket
2. Rocker arm
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
T106
T107
T108