Connecting Rod Big End Radial Clearance Inspection
Set the crankshaft on V blocks, and place a dial gauge [A]
against the connecting rod big end.
Push [B] the connecting rod first towards the gauge and
then in the opposite direction. The difference between
two gauge readings is the radial clearance.
Connecting Rod Big End Radial Clearance
If the radial clearance exceeds the service limit, crank-
shaft should be either replaced or disassembled and
crankpin, needle bearing, and connecting rod big end
should be examined for wear.
Connecting Rod Big End Side Clearance Inspection
Refer to the Crankshaft Inspection in the Periodic Main-
Crankshaft Runout Inspection
Set the crankshaft in a flywheel alignment jig or on V
blocks, and place a dial gauge as shown and turn the
crankshaft slowly. The maximum difference in gauge
reading is the crankshaft runout.
8.5 mm (0.33 in.) [A]
If the runout at either point exceeds the service limit, re-
place the crankshaft assembly with a new one or align the
crankshaft so that the runout falls within the service limit.
First correct the horizontal misalignment by striking the
projecting crank half [A] with a plastic, soft lead, or brass
hammer as shown.
Recheck the runout with a dial gauge and repeat the
process until the runout falls within the service limit.
0.002 mm ∼ 0.014 mm (0.00008 ∼
0.06 mm (0.0024 in.)
TIR 0.03 mm (0.001 in.) or less
TIR 0.08 mm (0.003 in.)