Cleaning and Inspection
Armature Tests
With starting motor completely disassembled, ex-
cept for removal of field coils, component parts
should be cleaned and inspected. Field coils should
be removed only where defects are indicated by
tests. Defective parts should be replaced or repaired.
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.
IMPORTANT: DO NOT use grease dissolving sol-
vents for cleaning over-running clutch, armature
and field coils. Such a solvent would dissolve
grease packed in clutch mechanism and damage
armature and field coil insulation.
a
1.
Test over-running clutch action. 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.
b
c
2.
3.
Check that brush holders are not damaged or
bent and will hold brushes against commutator.
Check brushes. Replace if pitted or worn to
one-half their original length [5/16 in. (8 mm) or
less].
01440
a - Hacksaw Blade
b - Armature Core
c - Growler
4.
5.
6.
Check fit of armature shaft in bushing of drive
housing. Shaft should fit snugly. Replace bush-
ing, if worn. Apply SAE 20 oil to bushing before
reassembly. Avoid excessive lubrication.
Check fit of bushing in commutator end frame. If
bushing is damaged or worn excessively, replace
end frame assembly. Apply SAE 20 oil to bushing
before reassembly. Avoid excessive lubrication.
Inspect armature commutator. If rough or
out-of-round, turn down and undercut. Inspect
points (where armature conductors join commu-
tator bars) for good, firm connection. Burned
commutator bar usually is evidence of poor con-
nection.
Index
4A-8 - STARTING SYSTEM
90-823224--2 796
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
Thank you