Universal M-18 - Checking Radial Clearance between Outer Rotor and Pump Body; Checking End Clearance between Rotor and Cover

PISTON, CONNECTING ROD
CHECKING INSIDE DIAMETER OF PISTON BOSSES
1. Measure the piston bosses with a cylinder gauge. Set the cylinder gauge's reference
measurement to 23 mm, and carry out zero point adjustment with an outside micrometer.
2. If the measurement exceeds the allowable limit, replace. See engine specifications
CHECKING CLEARANCE BETWEEN PISTON PIN AND SMALL END BUSHING
1. Measure the piston pin with an outside micrometer.
2. Measure the LD. of connecting rod small end bushing with an inside micrometer. Calculate the
clearance.
3. If the clearance exceeds the allowable limit, replace. See engine specifications
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