Cylinder Block

Fig. 29 Measuring Cylinder Bore:

1. Check cylinder block for leakage damage, cracks or scoring of walls, repairing or replacing as necessary.
2. Measure distortion of top surface of cylinder block. If distortion exceeds .006 inch (.15mm), grind to a maximum of .008 inch (.2mm), or replace cylinder block.
3. Measure cylinder bore in X and Y directions at three levels in each cylinder, Fig. 29. If cylinder bore is not 3.5433-3.5442 inches (90-90.22mm), rebore cylinder to oversize of .01 or .02 inch (.25 or .5mm).
4. If difference between top and bottom measurements exceeds .0007 inch (.019mm), rebore cylinder to oversize.
5. If out of round exceeds .0007 inch (.019mm), rebore cylinder to oversize. Boring size should be based on the size of an oversize piston and the same for all cylinders.
6. If upper part of cylinder wall shows uneven wear, remove ridge using ridge reamer.