Crankshaft

CRANKSHAFT










NOTICE: Bearing inserts must not be shimmed, scraped or filed. Do not touch the bearing surface of the insert with the bare fingers. Skin oil and acids will etch the bearing surface.

Important: Make sure the bearing cap bolt holes and the cap mating surfaces are clean and dry.


Install or Connect
1. Dip bearing cap bolts (19) in clean engine oil.

NOTICE: Upper and lower inserts may be different. Do not obstruct any oil passages.

2. Place bearing inserts (23) into the bearing cap (20) and into the engine block (71).
Refer to "Main Bearing and Connecting Rod Bearing Selection".

Important The inserts will project slightly when put into place. Make sure they project an equal distance on both sides. Make sure the insert tangs are engaged.

3. In the case of a thrust bearing type main bearing insert, coat the thrust surface with GM EEngine Oil Supplement (EOS)p/n 1052368 (or equivalent).
4. Lubricate the bearing surface with clean engine oil.
5. Crankshaft (22).
6. Oil gallery 0-ring (21) between the engine block and the rear main bearing cap (20).

NOTICE: In order to prevent the possibility of cylinder block and/or main bearing cap damage, the main bearing caps are to be tapped into their cylinder block cavity using a brass or leather mallet before attaching bolts are installed. Do not use attaching bolts to pull main bearing caps into their seats. Failure to observe this information may damage a cylinder block or bearing cap.

7. Bearing cap (20). Tap gently into place with a suitable tool.
- Apply a small amount of sealer GM p/n 1052942 to the rear of rear bearing cap sealing surface.

8. With crankshaft bearing and bearing caps installed and cap bolts started, thrust crankshaft rearward to set and align bearing caps, then thrust crankshaft forward to align rear face of thrust main bearing (Figure 62).

9. Main bearing cap bolts (19).
- Tighten Main bearing cap bolts (19) evenly to 50 N.m (37 lb. ft.).
- Turn main bearing cap bolts (19) evenly an additional 77° using J 36660.


Measure
^ Crankshaft end play (Figure 63).