CRANKSHAFT REPLACEMENT - CONTINUED
INSPECTION - CONTINUED
Check crankshaft for cracks which start at oil hole (21) and follow journal surface at angle of 45 degrees to axis.
Replace any crankshaft with such cracks. Determine presence of cracks not visible to eye by magnetic particle, fluores-
cent magnetic particle or fluorescent penetrant method.
Replace crankshaft if circumferential fillet cracks (22) at connecting rod, or fillet cracks or 45-degree cracks (45 degrees
to axis of crankshaft) at main bearing journal are evident.
Inspect all parts for wear or damage.
Ensure all main bearing saddles and thrust bearing counterbores in cylinder block are clean.
Each upper main bearing shell is grooved with oil hole. Register oil hole in each upper main bearing
shell with oil hole in each main bearing saddle of cylinder block.
Install main bearings in sets only. Do not mix old and new main bearing shells on same journal. If old
bearings are installed, they must be installed in same journal they were removed from.
Invert engine block. Install seven upper main bearing shells (16) in cylinder block journals (23).
Wipe oil from bearing shells and crankshaft journals to be checked.
Crankshaft weighs 408 lb (185.23 kg). Use suitable lifting device to lift and support crankshaft. Failure to do
so could result in serious injury to personnel.
Using nylon rope and suitable lifting device, position crankshaft (14) in cylinder block (15) on upper main bearing shells