82 UENR0623-02 Basic Engine 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. Illustration 71 g02351060 Typical example 1. 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). 2. Rotate the crankshaft until the piston is at the approximate top center. 3. Position Tooling (B) and Tooling (A) in order to measure the piston height above the cylinder block. The piston height should be measured at positions (X) or (Y). Slowly rotate the crankshaft in order to determine when the piston is at the highest position.
Record this dimension. Compare this dimension with the dimensions that are given in Specifications, “Piston and Rings”. i03635082 Flywheel - Inspect Illustration 70 g01201898 Typical example Table 11 Required Tools Tool Part Number Part Description Qty A 21825617 Dial Indicator Group 1