Pontiac 10181335 Bearing Unit,Connect Rod

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Improper bearing installation can cause oil starvation or high spots that result in failure.

If a piston ring expanding tool is available, use it to remove each of the rings from the piston. Alternatively, expand the ring just enough to clear the lands of the piston body, then place strips of tin (about Three-quarters in. wide) under the ring at equal distances around the piston and use a slight twisting motion to 'walk' the ring up and off the top.

When inspecting the bearings, they should be removed from the engine components and arranged on a clean surface in their original positions to facilitate matching any identified problems with the corresponding crankshaft journal.

Verify that the piston/rod assembly is correctly positioned by noting that most pistons will be marked with an 'F' or a drilled-out area indicating the piston should be installed with these marks toward the front of the engine, and the rod bearing tang slots should be towards the outside of the engine block once installed.

The procedure for checking main bearing clearances is as follows: 1. Install the main bearings and caps into the engine block, ensuring all oil, grime, and foreign materials are cleaned from the crankshaft and bearing surfaces. 2. Place a piece of Plastigage along each main bearing journal. 3. Install and tighten each main bearing cap according to specifications, ensuring the arrow on each cap faces the front of the engine. 4. After tightening, remove each bearing cap and measure the width of the flattened Plastigage strip using the scale provided on the envelope to determine bearing clearance.