MTU Detroit Diesel 183 Series Technical Publication page 186

Group 03
Subgroup 7004
Page 6
20080/1 E 98-12
Inspecting piston pin bore
Adjust bore gauge and measure pin bore.
If measurements exceed the limits as per Tolerances
and Wear Limits List, 03-7004, replace piston.
Check bronze bush surface for wear and scoring,
replace piston if necessary.
Inspecting piston pin
Using the magnetic crack-testing method with
fluorescent penetrant powder, check piston pin for
cracks; if cracks are found, replace piston pin.
Remove minor traces of wear and scoring by polishing.
Replace pins exhibiting scuffing, indentations and
severe wear.
Use an outside micrometer to measure diameter and
determine pin clearance.
If measurements exceed the limits as per Tolerances
and Wear Limits List, 03-7004, replace pin.
Inspecting piston rings
See Group/Subgroup 03-7312.
Task Description