3-68. ENGINE CRANKSHAFT AND MAIN BEARINGS INSTALLATION
THIS TASK COVERS:
Automotive repairman MOS 63H
Oil, lubricating, OE/HDO 30
Engine crankshaft and main bearings removed
(Appendix C, Item 21)
Oil, lubricating, gear 60-80/140
(Appendix C, Item 22)
SPECIAL ENVIRONMENTAL CONDITIONS
Fourteen lockplates (15434) 140218
Work area clean and away from blowing dirt and
Main bearing set
Standard: (15434) 3801260
0.010 Under: (15434) 3801261
GENERAL SAFETY INSTRUCTIONS
0.020 Under: (15434) 3801262
Use extreme caution during assembly; engine com-
Four thrust bearing washers
ponents are heavy.
0.010 Over: (15434)
0.020 Over: (15434)
The cylinder block saddle and cap mating surfaces must be clean and dry when bearing
halves are installed or engine damage may result.
Wipe main bearing bores, main bearings, engine crankshaft, and related parts with a clean
cloth. Ensure cloth does not leave any particles or lint in or on parts and bores or engine
damage may result.
The upper main bearings have a groove and oil hole to permit lubrication of engine
crankshaft; the lower main bearing halves do not. The upper main bearings for No. 2, 4,
and 6 are the same. The groove in upper main bearing half for No. 7 is not in the center.
Install the No. 7 main bearing so wider part of bearing (from groove) is toward flywheel
end of the cylinder block. Each main bearing has a groove. Install main bearings so
grooves will fit retaining rings.
Check for marks on crankshaft to determine size of main bearings and thrust rings. If
there are no marks, use standard-size parts.