ENGINE 3-33
PISTON RING FREE END GAP AND PISTON RING END GAP
• Measure the piston ring free end gap using the vernier cali-
pers.
• Next, fit the piston ring squarely into the cylinder and measure
the piston ring end gap using the thickness gauge.
• If any of the measurements exceeds the service limit, replace
the piston ring with a new one.
% Piston ring free end gap:
Service Limit (1st) : 5.6 mm
(2nd) : 4.9 mm
$ 09900-20102: Vernier calipers
% Piston ring end gap:
Service Limit (1st) : 0.50 mm
(2nd) : 0.50 mm
$ 09900-20803: Thickness gauge
CONROD AND CRANKSHAFT
CONROD SMALL END INSIDE DIAMETER INSPECTION
• Using the dial calipers, 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.:
Service Limit: 16.040 mm
$ 09900-20605: Dial calipers (1/100 mm, 10 – 34 mm)
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 width and crank pin width individ-
ually to determine, which one is to be replaced.
% Conrod big end side clearance:
Standard: 0.10 – 0.65 mm
Service Limit: 1.0 mm
$ 09900-20803: Thickness gauge
CONROD BIG END BEARING
• Check that the conrod turns smoothly without play and noise.
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