Piston, Connecting Rod, And Bearing Installation

Special Tools

• EN-45059  Angle Meter
• EN-51140  Crankshaft Fixing Tool

For equivalent regional tools, refer to Special Tools .

1. Coat the 8 connecting rod bearings and cylinder bores with engine oil.
Fig 1: Connecting Rod Bearings, Caps And Oil Notches
Courtesy of GENERAL MOTORS COMPANY
NOTE:

Ensure the proper seat of the oil notches (3).

NOTE:

If the old connecting rod bearings will be reused, install in their original position.

2. Install the 8 connecting rod bearings (2) to the connecting rod bearing cap (1) and the connecting rod.
Fig 2: Cylinder 1 And 4 Piston/Connecting Rod Assemblies And Upper Bearings
Courtesy of GENERAL MOTORS COMPANY
3. Install a piston ring compressor in order to compress the piston rings.
NOTE:

The arrow on the top of the piston and the marks (2) of the piston and connecting rod, must point to front of the engine.

NOTE:

If the old piston and connecting rod will be reused, install in their original position.

4. Install the 2 pistons (1) and the 2 connecting rods (4) with the connecting rod upper bearing (3) to the cylinder 1 and the cylinder 4.
Fig 3: Arrow On Top Of Pistons Must Point To Front Of Engine
Courtesy of GENERAL MOTORS COMPANY
5. The arrow on the top of the pistons (1) must point to front of the engine.
Fig 4: Cylinder 1 And 4 Connecting Rod Caps, Bolts And Lower Bearings
Courtesy of GENERAL MOTORS COMPANY
NOTE:

The marks (4) of the connecting rod bearing caps, must point to front of the engine.

NOTE:

If the old connecting rod bearing caps will be reused, install in their original position.

6. Install the 2 connecting rod bearing caps (2) with the 2 connecting rod lower bearings (1) to the cylinder 1 and the cylinder 4.
CAUTION:

Refer to Fastener Caution .

CAUTION:

Refer to Torque-to-Yield Fastener Caution .

7. Install 4 NEW connecting bearing cap bolts (3) and tighten in two passes:
   1. First pass tighten to 25 N.m (18 lb ft).
   2. Final pass an additional to 110 degrees, using the EN-45059  angle meter.
8. Set TDC of the cylinder 1. Rotate the crankshaft 180 degrees, use a pry bar at the 4 crankshaft pulley bolts (1).
Fig 5: Crankshaft Pulley Bolts
Courtesy of GENERAL MOTORS COMPANY
9. Remove the 4 crankshaft pulley bolts (1).
Fig 6: Crankshaft Fixing Tool
Courtesy of GENERAL MOTORS COMPANY
10. Install EN-51140  fixing tool (2).
11. Install the fixing pin into the engine block bore (1) and tighten the 2 bolts (3).
Fig 7: Cylinder 2 And 3 Piston/Connecting Rod Assemblies And Upper Bearings
Courtesy of GENERAL MOTORS COMPANY
12. Install a piston ring compressor in order to compress the piston rings.
NOTE:

The arrow on the top of the piston and the marks (4) of the piston and connecting rod, must point to front of the engine.

NOTE:

If the old piston and connecting rod will be reused, install in their original position.

13. Install the 2 pistons (1) and the 2 connecting rods (2) with the connecting rod upper bearing (3) to the cylinder 2 and the cylinder 3.
Fig 8: Cylinder 2 And 3 Connecting Rod Caps, Bolts And Lower Bearings
Courtesy of GENERAL MOTORS COMPANY
NOTE:

The marks (4) of the connecting rod bearing caps, must point to front of the engine.

NOTE:

If the old connecting rod bearing caps will be reused, install in their original position.

14. Install the 2 connecting rod bearing caps (2) with the 2 connecting rod lower bearings (1) to the cylinder 2 and the cylinder 3.
CAUTION:

Refer to Torque-to-Yield Fastener Caution .

15. Install 4 NEW connecting bearing cap bolts (3) and tighten in two passes:
    1. First pass tighten to 25 N.m (18 lb ft).
    2. Final pass an additional to 110 degrees, using the EN-45059  angle meter.