Mercury 40 Service Manual

CYLINDER BLOCK/CRANKCASE
Page 4B-2190-828631R3 MARCH 1999
Piston Rings
PISTON RING SIDE CLEARANCE
1. Measure piston ring side clearance. Replace piston and/or piston rings if out of specifi-
cation.
55842
Piston Ring Side Clearance
Top 0.002 - 0.003 in. (0.04 - 0.08 mm)
2nd 0.001 - 0.003 in. (0.03 - 0.08 mm)
PISTON RING END GAP CLEARANCE
1. Measure piston ring end gap clearance. Replace piston ring if out of specification.
53747
a
a-Push Piston Rings into Cylinder 0.8 in. (20 mm) Deep. Push in the Rings Using
the Piston.
Piston Ring End Gap
Top 0.006 - 0.012 in. (0.15 - 0.30 mm)
2nd 0.012 - 0.020 in. (0.30 - 0.50 mm)
Oil 0.008 - 0.028 in. (0.20 - 0.70 mm)

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