Piston - Mercury 40 Service Manual

Piston

MEASURING PISTON
1. Measure the piston at a point 0.2 in. (5.0 mm) from the bottom.
a -
b -
(Oversize) 0.020 in. (0.50 mm)
90-828631R3 MARCH 1999
b
a
Piston Diameter
0.2 in. (5.0 mm)
Piston Diameter "a"
Diameter (Standard)
Piston to Cylinder Clearance
0.0014 - 0.0026 in. (0.035 - 0.065 mm)
Minimum bore measurement
– maximum piston measurement
= piston to cylinder clearance
CYLINDER BLOCK/CRANKCASE
55838
2.4783 - 2.4789 in.
(62.950 - 62.965 mm)
2.4983 - 2.4989 in.
(63.450 - 63.465 mm)
Page 4B-19