Crankshaft, Engine

CRANKSHAFT





(a) Using a dial indicator and V-blocks, measure the circle runout as shown in the illustration.

Maximum circle runout: 0.03 mm (0.0012 in.)

If the circle runout is greater than maximum, replace the crankshaft.





(b) Using a micrometer, measure the diameter of each main journal at the points shown in the illustration.

Diameter: 47.988 to 48.000 mm (1.8893 to 1.8898 in.)

If the diameter is not as specified, check the crankshaft oil clearance.

(c) Check each main journal for taper and distortion as shown.

Maximum taper and distortion: 0.02 mm (0.0008 in.)

If the taper and distortion are greater than maximum, replace the crankshaft.





(d) Using a micrometer, measure the diameter of each crank pin at the points shown in the illustration.

Diameter: 43.992 to 44.000 mm (1.7320 to 1.7323 in.)

If the diameter is not as specified, check the connecting rod oil clearance.

(e) Check each crank pin for taper and distortion.

Maximum taper and distortion: 0.02 mm (0.0008 in.)

If the taper and distortion are greater than maximum, replace the crankshaft.

CRANKSHAFT BEARING CAP SET BOLT





(a) Using vernier calipers, measure the tension portion diameter of the bolts.

Standard diameter: 7.3 to 7.5 mm (0.287 to 0.295 in.)
Minimum diameter: 7.3 mm (0.287 in.)

If the diameter is less than minimum, replace the crankshaft bearing cap set bolt.

CRANKSHAFT OIL CLEARANCE

NOTE: Do not turn the crankshaft.





(a) Clean each main journal and bearing.
(b) Place the crankshaft on the cylinder block.
(c) Lay a strip of the Plastigage across each journal.





(d) Using SST, tighten the bolts to the specified torque in the several passes in the sequence shown.

Torque: 44 Nm (449 kgf-cm, 33 ft-lbf)





(e) Mark the front of the bearing cap bolts with paint.
(f) Retighten the bearing cap bolts by 90° as shown in the illustration.
(g) Check that the painted mark of each bolt is now at a 90° angle to the front.





(h) Tighten the 10 other bolts for the bearing cap.

Torque: 19 Nm (194 kgf-cm, 14 ft-lbf)

(i) Remove the 10 bolts.





(j) Uniformly loosen the 10 bearing cap bolts in several passes in the sequence shown in the illustration.





(k) Measure the Plastigage at its widest point.

Standard oil clearance: 0.015 to 0.032 mm (0.0006 to 0.0013 in.)

Maximum oil clearance: 0.05 mm (0.0020 in.)

NOTE: Completely remove the Plastigage.

- If the oil clearance is greater than maximum, replace the crankshaft bearing.
- If necessary, replace the crankshaft.

HINT: If replacing a bearing, select a new one with the same number. If the number of the bearing cannot be determined, calculate the correct bearing number by adding together the numbers imprinted on the cylinder block and crankshaft, then select a new bearing with the calculated number. There are 4 sizes of standard bearings, marked "1", "2", "3" and "4" accordingly.





EXAMPLE:
Cylinder block "3" (A) + Crankshaft "4" (B) = Total number 7 (Use bearing "3")