Mercury 40 Service Manual

CYLINDER BLOCK/CRANKCASE
Page 4B-1990-828631R3 MARCH 1999
Piston
MEASURING PISTON
1. Measure the piston at a point 0.2 in. (5.0 mm) from the bottom.
55838
b
a
a-Piston Diameter
b-0.2 in. (5.0 mm)
Piston Diameter “a”
Diameter (Standard) 2.4783 - 2.4789 in.
(62.950 - 62.965 mm)
(Oversize) 0.020 in. (0.50 mm) 2.4983 - 2.4989 in.
(63.450 - 63.465 mm)
Piston to Cylinder Clearance
0.0014 - 0.0026 in. (0.035 - 0.065 mm)
Minimum bore measurement
– maximum piston measurement
= piston to cylinder clearance

Mercury 40 Specifications

General

Horsepower	40 hp
Starting System	Electric
Steering	Remote
Fuel Induction System	EFI (Electronic Fuel Injection)
Shaft Length	20"
Full Throttle RPM Range	6000