| Required Tools | |||
|---|---|---|---|
| Tool | Part Number | Part Description | Qty |
| A | 1P-2403 | Dial Indicator | 1 |
| B | 1P-2402 | Gauge body | 1 |
If the height of the piston above the cylinder block is not within the tolerance that is given in Specifications, "Piston and Rings", the bearing for the piston pin must be checked. Refer to systems Operation, Testing and Adjusting, "Connecting Rod - Inspect". If any of the following components are replaced or remachined, the piston height above the cylinder block must be measured:
- Crankshaft
- Cylinder head
- Connecting rod
- Bearing for the piston pin
The correct piston height must be maintained in order to ensure that the engine conforms to the standards for emissions.
Note: The top of the piston should not be machined. If the original piston is installed, be sure that the original piston is assembled to the correct connecting rod and installed in the original cylinder.
Various grades of length of connecting rods determine the piston height above the cylinder block. The grade of length of a connecting rod is identified by a letter or a color. The letter or the color is marked on the side of the connecting rod. Refer to Systems Operation, Testing and Adjusting, "Connecting Rod - Inspect" and Specifications, "Connecting Rod" for additional information.
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| Illustration 1 | g01240623 |
Typical example | |
- Use Tooling (A) and Tooling (B) in order to measure the piston height above the cylinder block. Use the cylinder block face to zero Tooling (A).
- Rotate the crankshaft until the piston is at the approximate top center.
- Position Tooling (B) and Tooling (A) in order to measure the piston height above the cylinder block. Slowly rotate the crankshaft in order to determine when the piston is at the highest position. Record this dimension. Repeat this measurement of the piston height in four corners of the piston head. Record the highest dimension and compare this dimension with the dimensions that are given in Specifications, "Piston and Rings".