Cleaning And Inspection; Armature Tests - MerCruiser GM4 Service Manual

8. Remove gear from shaft assembly.
a - Gear
b - Shaft Assembly

Cleaning and Inspection

IMPORTANT: Do not use grease dissolving sol-
vents to clean electrical components, planetary
gears, or drive. Solvent will damage insulation
and wash the lubricant out of the drive and gears.
Use clean rags and compressed air to clean com-
ponents.
1. Test over-running clutch action of drive. Pinion
should turn freely in over-running direction and
must not slip in cranking direction. Check pinion
teeth. Check spring for tension and drive collar for
wear. Replace if necessary.
2. Check that brush holders are not damaged or
bent and hold brushes against commutator.
Check brushes for wear; refer to "Brushes and
Brush Holder."
3. Inspect armature commutator. If badly grooved or
out-of-round, turn down and undercut commuta-
tor.
Index
90-816462 2-695
a
b
72066
4. Inspect all roller bearing surfaces for wear. Check
that bearings roll freely. If any roughness is felt,
replace bearings.
5. Inspect planetary gear assembly. Gears must
mesh easily and roll freely with no binding.

Armature Tests

TEST FOR SHORTS
Check armature for shorts by placing on growler and
holding hack saw blade over armature core while ro-
tating armature. If saw blade vibrates, armature is
shorted. After cleaning between commutator bars,
recheck. If saw blade still vibrates, replace armature.
a - Hacksaw Blade
b - Armature Core
c - Growler
TEST FOR GROUND
1. With continuity meter, place one lead on armature
core or shaft and other lead on commutator.
a
b
c
01440
STARTING SYSTEM - 4A - 25