INSPECTION


PISTON RING


1.Check clearance between piston rings and ring grooves. If the limit is exceeded, replace piston rings or piston, or both.
note In cases of keystone type, measure the ring to groove clearance as shown.
Standard value:
    No. 1 ring: 0.08 - 0.12 mm
    No. 2 ring: 0.08 - 0.12 mm
    Oil ring: 0.02 - 0.06 mm
Limit:
    No. 1 ring: 0.15 mm
    No. 2 ring: 0.15 mm
    Oil ring: 0.10 mm

2.Put piston rings into the cylinder bore, press them against the piston top face, and push them in. After achieving squareness, measure the end gap with a free gauge. If the end gap is excessive, replace piston rings.
Standard value:
    No. 1 ring: 0.20 - 0.30 mm
    No. 2 ring: 0.20 - 0.35 mm
    Oil ring: 0.25 - 0.45 mm
Limit: 0.8 mm

CRANKSHAFT PIN OIL CLEARANCE (PLASTIGAGE METHOD)
1.Wipe oil off the crankshaft pin and connecting rod bearing.
2.Place a plastigage in length equal to the bearing width on the pin shaft straight in alignment with the shaft centre.

3.Carefully install the connecting rod cap.
4.Apply the engine oil to the bolt thread portion and the seat surface before tightening the bolt.
5.After finger-tightening each bolt, alternately tighten the bolts to correctly install the cap.
6.Tighten the bolt to the torque of 5.0 N·m.
7.Tighten the bolt to the torque of 20 N·m.

8.Put the paint mark to the bolt head, as shown in the illustration.
9.Put the paint mark on the connecting rod at 90° position in the tightening direction of the bolt, based on the paint mark position of the bolt.
caution
  • If the tightening angle is smaller than the specified tightening angle, the appropriate tightening capacity cannot be secured.

  • If the tightening angle is larger than the specified tightening angle, remove the bolt to start from the beginning again according to the procedures.
10.Tighten the bolt 90°. Make sure the paint mark of the connecting rod is aligned with the paint mark of the bolt.
11.Remove bolts and gently remove the connecting rod cap.

12.Measure the crushed plastigage width (area most widely crushed) using a scale printed on the plastigage bag.
Standard value: 0.026 - 0.053 mm
Limit: 0.1 mm