Piston, Connecting Rod, and Bearing Installation

Special Tools 

EN-45059  Angle Meter

Equivalent regional tools:Special Tools 

1. Courtesy of GENERAL MOTORS COMPANY

   The arrow (1) on the piston head must point to the timing side.

NOTE:

The connecting rod bearing caps must be installed in their original position.

2. Note the marking (2) of the connecting rod and connecting rod cap.
3. The piston ring joints must be displaced 120 degrees to each other.
4. Set the crankshaft to top dead center (TDC) of combustion stroke of cylinder 2.
5. Coat all pistons and cylinder bores with engine oil.

6. Courtesy of GENERAL MOTORS COMPANY

   Install a piston ring compressor in order to compress the piston rings.

7. Install the 2 pistons with connecting rods (2) and connecting rod upper bearing shells (1) into cylinder 1 and 4.

8. Courtesy of GENERAL MOTORS COMPANY

   Install the 2 connecting rod bearing caps (2) with connecting rod lower bearing shells (1) into cylinder 1 and 4.

CAUTION:

Refer to Fastener Caution .

CAUTION:

Refer to Torque-to-Yield Fastener Caution .

9. Install the 4 NEW connecting rod bearing cap bolts (3) to the cylinder 1 and 4 and tighten in following order:
   1. Tighten the bolts in first pass to 45 N.m (33 lb ft).
   2. Tighten the bolts a final pass to an additional 60 degrees, using the EN-45059  meter.
10. Turn crankshaft through 180 degrees and set crankshaft to TDC of combustion stroke of cylinder 1.

11. Courtesy of GENERAL MOTORS COMPANY

    Install a piston ring compressor in order to compress the piston rings.

12. Install the 2 pistons with connecting rod (2) with connecting rod upper bearing shells (1) into cylinder 2 and 3.

13. Courtesy of GENERAL MOTORS COMPANY

    Install the 2 connecting rod bearing caps (3) with the connecting rod lower bearing shells (1) into cylinder 2 and 3.

CAUTION:

Refer to Torque-to-Yield Fastener Caution .

14. Install the 4 NEW connecting rod bearing cap bolts (4) to cylinder 2 and 3 and tighten in following order:
    1. Tighten the bolts in first pass to 45 N.m (33 lb ft).
    2. Tighten the bolts a final pass to an additional 60 degrees, using the EN-45059  meter.