Main & Connecting Rod Bearings

Check connecting rod side play with a feeler gauge. If side play exceeds specifications, replace connecting rod.
Use Plastigage method to measure both main and connecting rod bearing clearances. Main bearing inserts are available in standard, .001" (.03 mm), .002" (.05 mm) and .010" (.25 mm) undersize. Connecting rod bearing inserts are available in standard, .002" (.005mm) and .010" (.25mm) undersize.
NOTE: Position each connecting rod with the marked side facing forward. Make sure connecting rods are assembled correctly by checking their matching number. See Fig 1 .

Fig 1: Connecting Rod Alignment Marks

NOTE: Connecting rod mark should face front of engine.
Check crankshaft for bend by placing front and rear main journals on "V" blocks and fitting a dial indicator on center journal. Correct or replace crankshaft if bend exceeds .0014" (.035 mm).