Shibaura N843, Руководство по ремонту

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109823 2/09 3-1
SECTION 3: DISASSEMBLY AND INSPECTION OF ENGINE
Caution: before starting disassembly
1. Check the cylinder block and cylinder head for wear, leakage or damage.
2. Clean oil passages with compressed air and check for clogging.
3. Thoroughly clean parts to remove dust, contaminated oil, carbon, and other foreign mate-
rial.
4. Remove carbon deposits on the piston, cylinder head, valves, etc. being careful not to dam-
age parts. (Especially for aluminum alloy parts.)
5. Valves, pistons, connecting rods, bearings and other parts, should be marked indicating
cylinder number and reassembled to the original cylinder location.
Rocker arm assembly
Disassembly
1. Screw in an M8 bolt at the front end of the rocker arm
shaft and extract the rocker arm shaft.
2. Take out the spring, shim and rocker arm from the
rocker arm bracket.
Inspection and service
1. Using a micrometer, check outside diameter of the
rocker arm shaft. If the shaft is worn beyond the
service limit, replace the part.
2. Measure the inside diameter of the rocker arm.
Check the clearance between the rocker arm and
rocker arm shaft. If the clearance is beyond the
service limit, replace the part.
Wear of rocker arm shaft ø in(mm)
Standard assembling value Service limit
0.4587-0.4594(11.65-11.67) Less than 0.4555(11.57)
Clearance between rocker arm and rocker arm shaft
in(mm)
Standard assembling value Service limit
0.0013-0.0027(0.032–0.068) More than .008(0.2)
Fig. 3-1
1. Screw
2. Rocker arm shaft
3. Rocker arm 4. Spring
5. Shim
3
5
1
2
4
Fig. 3-2
Fig. 3-3
Clearance