Mercury 40 Service Manual

CHARGING AND STARTING SYSTEM
Page 2B-20 90-828631R3 MARCH 1999
14. Measure the armature shaft for deflection. If the armature has greater than 0.002 in.
(0.05 mm) deflection, replace armature.
a
c
b
a
a-Armature
b-V-Block
c-Dial Indicator Gauge
15. Measure the commutator diameter. Replace if not within specification.
MIN.
a
bb
a-Commutator
b-Commutator Diameter Wear Limit - 1.22 in. (31.0 mm)
16. Measure the mica undercut of the commutator. Clean out and undercut mica and build
up of brush material to a depth of 0.003 - 0.008 in. (0.2 - 0.8 mm).
a
b
a-Commutator Depth
b-File (or use commutator cutter)

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