ENGINE 3-37
CONROD AND CRANKSHAFT
CONROD SMALL END INSIDE DIAMETER INSPECTION
Using a small bore dial gauge, measure the conrod small end
inside diameter both in vertical and horizontal directions. If any
of the measurements exceeds the service limit, replace the
conrod.
# Conrod small end I.D.:
Standard: 12.006 – 12.014 mm
Service Limit: 12.040 mm
% 09900-20605: Dial calipers
CONROD DEFLECTION INSPECTION
Move the small end sideways while holding the big end immov-
able in thrust direction.
Measure the amount of deflection.
Turn the conrod and see if it moves smoothly without play and
noise.
This method can check the extent of wear on the parts of the
conrod’s big end.
# Conrod deflecition: Service Limit: 3.0 mm
% 09900-20701: Magnetic stand
09900-20606: Dial gauge (1/100 mm)
09900-21304: V-block
CONROD BIG END SIDE CLEARANCE INSPECTION
Using a thickness gauge, measure the side clearance at the
conrod big end. If the measurement is out of standard value,
measure the conrod big end and the crank pin widths individu-
ally to determine which one is to be replaced.
# Conrod big end side clearance
Standard: 0.10 – 0.56 mm
Service Limit: 1.00 mm
% 09900-20803: Thickness gauge
CRANKSHAFT RUNOUT INSPECTION
With the right and left crank journals supported with V-block,
turn the crankshaft slowly. At this time, measure the crankshaft
end runout using a dial gauge. If the runout exceeds the service
limit, replace the crankshaft.
# Crankshaft runout: Service Limit: 0.08 mm
% 09900-20701: Magnetic stand
09900-20606: Dial gauge (1/100 mm)
09900-21304: V-block
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