Mack MP7 - Piston Inspection and Cleaning

Page 162
REPAIR INSTRUCTIONS, PART 1
3. Inspect the mating surfaces between the
connecting rod and cap for correct fit.
4. Inspect the wrist pin.
5. Inspect the wrist pin bearing surface in the
connecting rod.
6. Inspect the crankshaft journal bearing
surfaces of the rod and cap.
If it is determined that any component is in
questionable condition or is at the limit of
dimensional tolerance, replace it.
CONNECTING ROD ALIGNMENT
1. Assemble the connecting rod in the
connecting rod fixture.
209
Figure 209 — Connecting Rod Fixture
2. Using the appropriate mandrel and plunger
extension, inspect the connecting rod for
twist and bend. Replace the connecting rod
if twist or bend is beyond the maximum
allowable limits.
Piston Inspection and Cleaning
[212 NP]
INSPECTION
1. On removal, tag each piston to identify it so
that it can be returned to its original cylinder.
2. Inspect the piston ring grooves, lands, skirt
and combustion bowl for wear, scuff marks,
cracks and blow-by. Pistons are NOT
repairable. Discard worn or damaged
pistons.
Do not stamp or engrave on the TOP of the
piston. Failure to heed this caution may result in
severe engine damage.