CYLINDER HEAD REPAIR - CONTINUED
CLEANING AND INSPECTION - CONTINUED
Maximum amount of resurfacing is 0.030 in (0.762 mm). Limit resurfacing to 0.030 in (0.762 mm). If
exceeded, replace cylinder head to prevent damage to equipment.
Record amount of stock removed from cylinder head by stamping amount removed on pad (43) on front of cylinder
head. Measure from top rail (44) to fire deck surface (45). Resurface finish must be 90 U in AA (2.3 UM AA).
It may be necessary to restore injector tube counterbore when cylinder head is resurfaced.
Ensure countersink injector tube bores (46) land width is 0.040-0.080 in (1.0-2.0 mm) (47) x 45 degrees (48).
If cylinder head fire deck has been resurfaced, valves must be seated deeper to restore valve head recess
depth to specification limits. Do not grind new valve seat inserts for this purpose. Reduced-thickness valve
seat inserts are available, 0.010, 0.020, and 0.030 in (0.254, 0.508, and 0.762 mm) shallower than standard.