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Crank pin and connecting rod bearings
Crank pin diameter
Inspect crank pin for uneven wear or damage. Measure crank pin
for out-of-round or taper with a micrometer. If crank pin is dam-
aged or out-of round or taper is out of limit, replace crankshaft or
regrind crank pin to undersize and use undersize bearing.
Crank pin diameter
Connecting rod
bearing size
Standard
Undersize
0.25 mm (0.0098 in.)
Crank pin taper and out-of-round
Limit: 0.01 mm (0.0004 in.)
Out-of-round: A – B
Taper: a – b
Connecting rod bearing general information
Service connecting rod bearings are available in standard size
and 0.25 mm (0.0098 in.) undersize, and standard size bearing
has 5 kinds of bearings differing in tolerance.
For identification of undersize bearing, it is painted red at the
position as indicated in figure, undersize bearing thickness is
1.605 – 1.615 mm (0.0632 – 0.0635 in.) at the center of it.
1. Painting
Connecting rod bearing visual inspection
Inspect bearing shells for signs of fusion, pitting, burn or flaking
and observe contact pattern. Bearing shells found in defective
condition must be replaced.
Connecting rod bearing clearance
1) Before checking bearing clearance, clean bearing and crank
pin.
2) Install bearing in connecting rod and bearing cap.
3) Place a piece of gaging plastic (1) to full width of crank pin as
contacted by bearing (parallel to crankshaft), avoiding oil
hole.
ENGINE MECHANICAL (M13 ENGINE) 6A2-75
Crank pin diameter
41.982 – 42.000 mm
(1.6529 – 1.6535 in.)
41.732 – 41.750 mm
(1.6430 – 1.6436 in.)
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