Cylinder Block Assembly: Testing and Inspection

CYLINDER BORE INSPECTION NEED SPECS
The cylinder walls should be checked for out-of- round and taper with Tool C-119. The cylinder bore out-of-round is 0.050 mm (.002 inch) maximum and cylinder bore taper is 0.051 mm (0.002 inch) maximum. If the cylinder walls are badly scuffed or scored, the cylinder block should be rebored and honed, and new pistons and rings fitted. Whatever type of boring equipment is used, boring and honing operation should be closely coordinated with the fitting of pistons and rings in order that specified clearances may be maintained. Refer to Honing Cylinder Bores.







Measure the cylinder bore at three levels in directions A and B. Top measurement should be 10 mm ( 3/8 inch) down and bottom measurement should be 10 mm ( 3/8 inch.) up from bottom of bore. Refer to specifications.




HONING CYLINDER BORES
1. Used carefully, the cylinder bore resizing hone C-823 equipped with 220 grit stones, is the best tool for this job. In addition to deglazing, it will reduce taper and out-of-round as well as removing light scuffing, scoring or scratches. Usually a few strokes will clean up a bore and maintain the required limits.
2. Deglazing of the cylinder walls may be done using a cylinder surfacing hone, Tool C-3501, equipped with 280 grit stones, if the cylinder bore is straight and round. 20-60 strokes, depending on the bore condition, will be sufficient to provide a satisfactory surface. Inspect cylinder walls after each 20 strokes,using a light honing oil. Do not use engine or transmission oil, mineral spirits or kerosene.






3. Honing should be done by moving the hone up and down fast enough to get a cross-hatch pattern. When hone marks intersect at 50-60 degrees, the cross hatch angle is most satisfactory for proper seating of rings.