Crankshaft, Engine

CRANKSHAFT END PLAY





^ Measure the clearance between thrust bearings and crankshaft arm when crankshaft is moved fully forward or backward with a dial indicator.
Standard: 0.10 - 0.25 mm (0.0039 - 0.0098 inch)
Limit: 0.30 mm (0.0118 inch)
^ If the measured value exceeds the limit, replace thrust bearings, and measure again. If it still exceeds the limit, replace crankshaft also.

CRANKSHAFT OUT-OF-ROUND AND TAPER
^ Measure the dimensions at four different points as shown in the figure on each main journal and pin journal with a micrometer.
^ Out-of-round is indicated by the difference in the dimensions between X and Y at A and B.
^ Taper is indicated by the difference in the dimensions between A and B at X and Y.
Limit:
Out-of-round (Difference between X and Y: 0.002 mm (0.0001 inch)
Taper (Difference between A and B): 0.002 mm (0.0001 inch)
If the measured value exceeds the limit, correct or replace crankshaft. If corrected, measure the bearing oil clearance of the corrected main journal and/or pin journal. Then select the main bearing and/or connecting rod bearing.

CRANKSHAFT RUNOUT





^ Place V-block on precise flat table, and support the journals on the both end of crankshaft.
^ Place a dial indicator straight up on the No. 3 journal.
^ While rotating crankshaft, read the movement of the pointer on a dial indicator. (Total indicator reading)
Standard: Less than 0.05 mm (0.0020 inch)
Limit: 0.10 mm (0.0039 inch)
^ If it exceeds the limit, replace crankshaft.

CYLINDER BLOCK:

CYLINDER BLOCK

CRANKSHAFT:

CRANKSHAFT