Daihatsu F300 Service Manual page 1263

~EN~G~I~N~E~M~E~C~H~A~N~IC~A~L~S~-------------------------------------tt
INSPECTION OF CRANKSHAFT
1. Visually inspect the main journals and crankpin journals for
pitting or scratches.
If the main journals and crankpin journals are damaged,
replace the crankshaft.
2. Measurement of crankshaft runout
(1) Support the both ends of the crankshaft with a V-shaped
blocks.
Measure the crankshaft runout with a dial gauge.
Allowable Runout Umtt: 0.6 mm
If the runout exceeds the allowable limit, replace the
crankshaft.
3. Measurement of crankshaft journals
( 1) Measure the diameter of each crankshaft main journal at
four points, 90 degrees spaced as shown in the right
figure.
The maximum value is regarded as the crankshaft main
journal diameter.
If the variation in the measured diameters exceeds 0.026
mm, replace the crankshaft.
(2) Measure the diameter of each crankpin journal at four
points,
90
degrees spaced as shown in the right figure.
The maximum value is regarded as the crankpin joumal
diameter.
If the variation in the measured diameters exceeds
0.044 mm, replace the crankshaft.
Specified Diameter:
Main Journal: 49.976- 50.000 mm
Crankpin Journal: 44.976- 45.000 mm
!INSPECTION OF CONNECTING ROD
1. Visua11y inspect the connecting rods for damage or cracks.
2. Check the connecting· rod for bend and twist, using a con-
necting rod ar.gner.
Allowable Bend: 0.05 mm
Allowable Twist: 0.05 mm
If the bend or twist is greater than the allowable limit. replace
the connecting rod assembly.
EM-122
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Crank~ haft
y
+
y
Unit:
ITm
A 6
+
y
4 14 4 14 4 14 4 14
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Unit: mm
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