Cylinder Block Assembly: Testing and Inspection

Block and Piston Inspection

1. Remove the pistons from the engine block Crankshaft and Piston Removal.

2. Check the pistons for distortion or cracks.

3. Measure the piston skirt diameter at a point 16.0 mm (0.63 in) from the bottom of the skirt.

Piston Diameter










4. Measure the wear and taper in direction X and Y at three levels in each cylinder as shown.

5. If the measurements in any cylinder are beyond the service limit or the cylinders are damaged, replace the engine block. The J37A1 engine block can not be rebored.

Cylinder Bore Size














6. Check the top of the engine block for warpage. Measure along the edges and across the center as shown.

Engine Block Warpage










7. Calculate the difference between cylinder bore diameter and the piston diameter. If the clearance is near or exceeds the service limit, inspect the piston and the cylinder bore for excessive wear.

Piston-to-Cylinder Bore Clearance