Spark

Piston, Connecting Rod, and Bearing Replacement

Special Tools

EN-50174 Piston Ring Compressor

For equivalent regional tools, refer to Special Tools

1. Remove the cylinder head. Refer to Cylinder Head Replacement : with CH-49290 → with EN-50176 .
2. Remove the sump. Refer to Sump Replacement
3. Raise the vehicle by its full height. Refer to Lifting and Jacking the Vehicle .
4. Install the crankshaft balancer bolt.
5. Set the pistons 1 and 4 to BDC in direction of engine rotation.



6. Mark the connecting rod with the big end bearing cover (1).



7. Remove the 4 big end bearing caps nuts (2) of cylinder 1 and 4.
8. Remove the big end bearing caps (1) and the big end bearing (3).



9. Push the pistons 1 and 4 (1) out of the cylinder bore (2).
10. Lower the vehicle.

Note: The shear surfaces of the con-rod and the con-rod bearing cover form a unique fit and must not be swapped or damaged. Do not lay down on the shear surfaces.

11. Remove the pistons 1 and 4 (1).
12. Raise the vehicle by its full height.
13. Turn crankshaft on crankshaft balancer through 180 degrees in direction of rotation of engine.
14. Repeat for the piston 2 and 3.




Note: Observe correct fitting position, observe alignment.

15. Remove the big end bearing (1, 2).
16. Check the components. Refer to Piston, Connecting Rod, and Bearing Cleaning and Inspection .

Note: Lubricate the connection rod bearing with NEW engine oil.

1. Install the big end bearing (1, 2).



2. Set piston ring joints.

•	Piston compression upper ring in position (1).

•	Piston compression lower ring in position (4).

•	Interim ring of the piston oil ring rail in position (5), steel band rings of the piston oil ring rail in position (2) and/or (3).




3. Lubricate the piston rings, piston (1), inner cylinder bore surface and EN-50174 piston ring compressor (2) with clean engine oil.




Note: Arrow on piston head points to engine timing side, bead on connecting rod points to transmission side of engine.

4. Push the pistons 2 and 3 (1) into the cylinder bore (2).
5. Raise the vehicle by its full height.



6. Install the big end bearing caps (1) and the big end bearing (3).

Caution: Refer to Fastener Caution in the Preface section.

7. Install 4 NEW big end bearing caps bolts (2) of cylinder 2 and 3 and tighten to 33 N·m (24 lb ft).
8. Turn crankshaft on crankshaft balancer through 180 degrees in direction of rotation of engine.
9. Repeat for the piston 1 and 4.
10. Set the crankshaft in direction of engine rotation to 60 degrees before UDC.
11. Install the oil pan. Refer to Sump Replacement .
12. Install the cylinder head. Refer to Cylinder Head Replacement : with CH-49290 → with EN-50176 .