Repair Manual

PISTON AND CONNECTING ROD
ENGINE OVERHAUL <4A9>
11B-43
INSPECTION
M1113008500837
PISTON RING
AK304899
1. Measure the clearance between the piston ring
and the ring groove. If the measured value
exceeds the limit, replace the piston ring, or both
the piston and the piston ring.
Standard value:
No. 1 ring: 0.03 − 0.07 mm
No. 2 ring: 0.02 − 0.06 mm
Limit: 0.1 mm
AK305608
AB
End gap
Piston ring
Press down ring
with piston
2. Insert the piston ring into the cylinder bore. Insert
the piston with the top face end first into the
cylinder bore, pushing the piston ring and
positioning it squarely with the cylinder bore.
Then, measure the piston ring end gap using a
feeler gauge. If the measured value exceeds the
limit, replace the piston ring.
Standard value:
No. 1 ring: 0.15 − 0.30 mm
No. 2 ring: 0.20 − 0.40 mm
Oil ring: 0.10 − 0.40 mm
Limit:
No. 1 ring: 0.8 mm
No. 2 ring: 0.8 mm
Oil ring: 1.0 mm
CRANKSHAFT PIN OIL CLEARANCE
(PLASTIGAGE METHOD)
1. Wipe off oil from the crankshaft pin and the
connecting rod bearings.
2. Place a plastigage, with a length equal to the
bearing width, onto the crank pin in the axial
direction.
AK304897AB
Plastigage
3. Carefully install the connecting rod cap over the
plastigage, and tighten the bolts to 15
± 2 N⋅m →
+ 90 to 94 degree angle.
4. Remove the bolts. Slowly remove the connecting
rod cap.
AK304898AB
Plastigage
5. Using the measure printed on the plastigage
package, measure the width (widest portion) of
the crushed plastigage.
Standard value: 0.014 − 0.059 mm
Limit: 0.1 mm
Main
Index
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