EM-104
ENGINE MECHANICAL - Cylinder Block
INSPECTION AND REPAIR OF CRANKSHAFT
1. INSPECT CRANKSHAFT FOR RUNOUT
(a) Place the crankshaft on V-blocks.
(b) Using a dial indicator, measure the circle runout at the
center journal.
Maximum circle runout: 0.06 mm (0.0024 in.)
If the circle runout is greater than maximum, replace the
crankshaft.
2. INSPECT MAIN JOURNALS AND CRANK PINS
(a) Using a micrometer, measure the diameter of each
main journal and crank pin.
Main journal diameter:
STD 66.982-67.000 mm
(2.6371 -2.6378 in.)
U/S 0.25 66.745 - 66.755 mm
(2.6278-2.6281 in.)
U/S 0.50 66.495 - 66.505 mm
(2.6179-2.6183 in.)
Crank pin diameter:
STD 58.982-59.000 mm
(2.3221-2.3228 in.)
U/S 0.25 58.745-58.755 mm
(2.3128-2.3132 in.)
U/S 0.50 58.495-58.505 mm
(2.3029-2.3033 in.)
If the diameter is not as specified, check the oil clearance
(See pages EM-86 to 92).
(b) Check each main journal and crank pin for taper and
out-of-round as shown.
Maximum taper and out-of-round: 0.02 mm
(0.0008 in.)
If the taper or out-of-round is greater than maximum, grind
or replace the crankshaft.
3. IF NECESSARY, GRIND AND HONE MAIN
JOURNALS AND/OR CRANK PINS
Grind and hone the main journals and/or crank pins to the
finished undersized diameter (See procedure step 2).
Install new main journal and/or crank pin undersized
bearings.
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