64. Piston, Connecting Rod, and Bearing Installation
PISTON, CONNECTING ROD, AND BEARING INSTALLATIONTOOLS REQUIRED
- J 8037 Piston Ring Compressor
- J 36660-A Torque Annie Meter
- J 41556 Connecting Rod Guide
PISTON SELECTION
IMPORTANT: Measurements of all components should be taken with the components at normal room temperature. For proper piston fit, the engine block cylinder bores must not have excessive wear or taper. A used piston and pin set may be installed if, after cleaning and inspection, they are within specifications.
1. With a micrometer at a right angle, measure the piston outside diameter (OD). Measure the diameter 43 mm (1.69 in) from the top of the piston.
2. Record the piston OD.
3. Adjust the micrometer to the recorded piston OD.
4. Insert the J 8087 into the micrometer and zero the gage dial.
5. Using the J 8087, measure the cylinder bore inside diameter (ID). Measure at a point 64 mm (2.5 in) from the top of the cylinder.
6. Record the cylinder bore ID.
7. Subtract the piston diameter from the cylinder bore diameter in order to determine the piston-to-bore clearance. Refer to Engine Mechanical Specifications (LQ4 VIN U).
8. If the proper clearance cannot be obtained, select another piston, pin, and connecting rod assembly and again measure the clearances. If the proper fit cannot be obtained, the cylinder bore may require honing for an oversize piston.