Piston, Pin, and Connecting Rod Replacement

Disassembly


1.Remove the piston from the cylinder block.

2.Apply engine oil to the piston pin snap rings (A), and turn them in the ring grooves until the end gaps are lined up with the cutouts in the piston pin bores (B).

NOTE: Take care not to damage the ring grooves.

 

3.Remove both snap rings (A). Start at the cutout in the piston pin bore. Remove the snap rings carefully so they do not go flying or get lost. Wear eye protection.

 

4.Heat the piston and connecting rod assembly to about 70°C (158°F), then remove the piston pin.

 

Inspection


NOTE: Inspect the piston, piston pin, and connecting rod when they are at room temperature.

1.Measure the diameter of the piston pin.

Piston Pin Diameter:
Standard (New): 21.961-21.965 mm
(0.8646-0.8648 in.)
 
Service Limit: 21.953 mm (0.8643 in.) 

 

2.Zero the dial indicator to the piston pin diameter.

 

3.Check the difference between the piston pin diameter and piston pin hole diameter in the piston.

Piston Pin-to-Piston Clearance:
Standard (New): -0.005 to +0.002 mm
(-0.00020 to +0.00008 in.)
 
Service Limit: 0.005 mm (0.0002 in.) 

 

4.Measure the piston pin-to-connecting rod clearance.

Piston Pin-to-Connecting Rod Clearance:
Standard (New): 0.005-0.015 mm
(0.0002-0.0006 in.)
 
Service Limit: 0.02 mm (0.0008 in.) 

 

Reassembly


1.Install a piston pin snap ring (A).

 

2.Coat the piston pin bore in the piston, the bore in the connecting rod, and the piston pin with engine oil.

3.Heat the piston to about 70°C (158°F).

 

4.Install the piston pin (A). Assemble the piston (B) and connecting rod (C) with the arrow (D) and the embossed mark (E) on the same side.

 

 

5.Install the remaining snap ring (F).

6.Turn the snap rings in the ring grooves until the end gaps are positioned at the bottom of the piston.