Maintenance Manual of 4M11 Series Diesel Engine For Land Power Generators
112
Appendix B Wear Evaluation References for Main Friction Pairs in Diesel
Engine
(Reference value)
Wear limit
mm
Clearance limit
mm
Closed gap of the 1st piston ring 1.70 -
Height of the 1st piston ring 0.10 -
Closed gap of the 2nd piston ring 1.50 -
Height of the 2nd piston ring 0.10 -
Closed gap of oil ring 1.50 -
Height of oil ring 0.15 -
Outside diameter of piston skirt 0.25
0.60
Inside diameter of cylinder liner 0.50
Outside diameter of piston pin 0.04
0.10
Inside diameter of piston pin hole 0.08
Inside diameter of bushing at connecting
rod small end
0.08
Outside diameter of main journal of
camshaft
0.06
0.10
Inside diameter of camshaft bushing 0.06
Height of cam nose relative to basic circle 2.00 -
Outside diameter of basic circle of cam 0.05 -
Outside diameter of crankshaft journal for
connecting rod
0.12
0.15
Inside diameter of connecting rod bearing 0.10
Outside diameter of crankshaft main
journal
0.08
0.15
Inside diameter of main bearing 0.10
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