Crankshaft and Bearings Installation

Tools Required 

J 36660-A  Torque Angle Meter

Important  : Ensure that the crankshaft bearing cap bolt holes and the crankshaft bearing cap mating surfaces are clean and dry.

1. Dip the crankshaft bearing cap bolts in clean engine oil.
   NOTE: Upper and lower inserts may be different. Do not obstruct any oil passages.
2. Place the crankshaft bearing inserts into the crankshaft bearing cap and into the engine block.
   Fig 1: Crankshaft & Bearings

   Courtesy of GENERAL MOTORS CORP.

   Important  : The crankshaft bearing inserts will project slightly when put into place. Ensure that the bearing inserts project an equal distance on both sides. Ensure that the insert tangs are engaged.

3. Coat the crankshaft main thrust bearing surface with GM P/N United States 1052367, GM P/N Canada 992869 or the equivalent.
4. Lubricate the crankshaft main bearing surface with clean engine oil.
5. Install the crankshaft.
   NOTE: In order to prevent the possibility of cylinder block or crankshaft bearing cap damage, the crankshaft bearing caps are tapped into the cylinder block cavity using a brass, lead, or a leather mallet before the attaching bolts are installed. Do not use attaching bolts to pull the crankshaft bearing caps into the seats. Failure to use this process may damage a cylinder block or a bearing cap.
6. Install the crankshaft main bearing caps. Apply a small amount of sealer GM P/N United States 1052942, GM P/N Canada 10953466 to the rear of the #4 crankshaft main bearing cap sealing surface.
   NOTE: Refer to FASTENER NOTICE .
7. Install the crankshaft main bearing cap bolts.

   Tighten 

   Use the J 36660-A  in order to tighten the crankshaft main bearing cap bolts to 50 N.m (37 lb ft) plus 77 degrees.

Fig 2: Measuring Crankshaft End Play
Courtesy of GENERAL MOTORS CORP.
8. Measure the crankshaft end play.
   1. Thrust the crankshaft forward or rearward.
   2. Insert a feeler gage between the number 3 crankshaft bearing and the bearing surface of the crankshaft and measure the bearing clearance. The proper crankshaft end play clearance is 0.032-0.077 mm (0.0012-0.0030 in).
   3. If the bearing clearance is not within specifications, inspect the thrust surfaces for nicks, gouges or raised metal. Minor imperfections may be removed with a fine stone.
Fig 3: Crankshaft Position Sensor
Courtesy of GENERAL MOTORS CORP.
9. Install the crankshaft position sensor into the side of the engine block.
10. Apply threadlock GM P/N United States 12345382, GM P/N Canada 10953489 or the equivalent to the crankshaft position sensor stud threads.
11. Install the crankshaft position sensor stud.

    Tighten 

    Tighten the crankshaft position sensor stud to 11 N.m (98 lb in).