3-50 ENGINE
PISTON PIN AND PIN BORE
Using a small bore gauge, measure the piston pin bore inside
diameter, and using a micrometer, measure the piston pin out-
side diameter. If the difference between these two measure-
ments is more than the limits, replace both piston and piston pin.
& Piston pin bore I.D.
Service limit: 22.030 mm (0.8673 in)
" 09900-20602: Dial gauge (1/1000 mm, 1 mm)
09900-22403: Small bore gauge (18 – 35 mm)
Using a micrometer, measure the piston pin outside diameter at
three positions.
& Piston pin O.D.
Service Limit: 21.980 mm (0.8654 in)
" 09900-20205: Micrometer (0 – 25 mm)
CONROD/CRANKSHAFT
CONROD SMALL END I.D.
Using a small bore gauge, measure the inside diameter of the
conrod small end.
" 09900-20602: Dial gauge (1/1000 mm, 1 mm)
09900-22403: Small bore gauge (18 – 35 mm)
& Conrod small end I.D.
Service Limit: 22.040 mm (0.8677 in)
If the inside diameter of the conrod small end exceeds the limit,
replace the conrod.
CONROD BIG END SIDE CLEARANCE
Check the conrod side clearance by using a thickness gauge. If
the clearance exceeds the limit, replace conrod or crankshaft.
& Conrod big end side clearance
Service Limit: 0.50 mm (0.020 in)
" 09900-20803: Thickness gauge
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