Figure 1—28-MT Starter Motor
GENERAL DESCRIPTION
STARTER MOTOR
The Delco Remy 28-MT is a gear reduction starter.
An internal gear at the gear-reduction end of the
driveshaft is driven by the armature shaft gear at a
speed of one drive shaft revolution for each 3.9 revolu
tions of the armature.
The starter has an overrunning roller-type clutch and
an enclosed shift lever. The solenoid is sealed to pre
vent entry of foreign material.
IDENTIFICATION
The part number is stamped on a label and attached
to the field frame (figure 1).
DIAGNOSIS
NO-LOAD TEST
Before disassembling the starter motor for repair, the
following tests should be made.
N O T I C E : N e v e r o p e r a t e t h e s t a r t e r m o t o r
m o r e t h a n 3 0 s e c o n d s a t a t i m e w i t h o u t
p a u s i n g to a l l o w i t to c o o l f o r a t l e a s t 2 m in
u t e s . O v e r h e a t i n g , c a u s e d b y t o o m u c h
c r a n k in g , w il l d a m a g e t h e s t a r t e r m o t o r .
Inspect
1. Pinion for freedom of rotation by turning it in the
overrun direction on the shaft. The pinion should
rotate without turning the drive assembly shaft.
2. Armature for freedom of rotation by turning the pin
ion in the cranking direction. The pinion, shaft, and
body of the drive assembly should all rotate togeth
er. If necessary, pry the pinion with a screwdriver to
turn it.
• Tight bearings, a bent armature shaft, or a
loose pole screw will cause the armature to
bind.
• If the armature does not turn freely, the motor
should be disassembled.
• If the armature rotates freely, the motor should
be given a no-load test before disassembly.
Test Connections
Connect the starter motor for the test as shown in
figure 2.
1. Secure the starter motor in a test stand.
2. Use a momentary contact pushbutton switch in the
test circuit that can be released quickly if very high
current surges occur.
3. Make all connections and disconnections with the
switch open and the carbon pile off.
4. If sparking or current flow occurs in the battery
circuit when connections are being made, the start
er motor solenoid switch contacts may be frozen
shut.
5. As the last step in making test connections, ground
the negative battery cable securely to a clean met
al ground on the starter motor frame.
6. The carbon pile load is used to adjust operating
voltage for comparison with specifications. It may
not be necessary in all cases.
Test Procedure
CAUTION: Keep fingers and tools away from
the opening in the drive end housing while
testing. The strong shifting action of the sole
noid could cause personal injury or damage
as the drive pinion moves into the cranking
position and spins.
Summary of Contents for S Series 1994
Page 1: ......
Page 11: ...VIEW A p n n n j VIEW C F7554 Figure 10 Hydra Matic 4L60 E Transmission I D Location...
Page 24: ...NOTES...
Page 26: ......
Page 69: ...NOTES...
Page 71: ...3 2 STEERING...
Page 73: ......
Page 84: ......
Page 102: ...40...
Page 130: ...NOTES...
Page 146: ...NOTES...
Page 162: ...NOTES...
Page 166: ...Figure 5 Removing the Pinion Flange Figure 6 Pressing the Drive Pinion from the Cage...
Page 178: ...Figure 3 Spreading the Differential Case Figure 4 Removing the Differential...
Page 190: ...NOTES...
Page 202: ...NOTES...
Page 206: ...F5785...
Page 212: ...B Button Moved Out of Bearing Bore F5791...
Page 228: ...NOTES...
Page 232: ......
Page 234: ......
Page 236: ...Adjuster 63 Bolt 64 Lock Figure 10 Turning the Adjuster Plug K3 Models...
Page 237: ...Figure 13 Removing the Pinion Seal 39 Bearing Cup Figure 16 Removing the Inner Bearing Cap...
Page 261: ...F7475...
Page 267: ...B Button Moved Out of Bearing Bore F5791...
Page 294: ...NOTES...
Page 300: ...NOTES...
Page 318: ...NOTES...
Page 322: ...SR207LN2 EDS...
Page 324: ......
Page 326: ...OVERHEAD OILING AND RETURN MAIN OIL GALLERY N30005 6A2 J EDS...
Page 368: ...103 153 127 V1200...
Page 370: ......
Page 372: ......
Page 374: ...F9375 Figure 7 Engine Lubrication Diagram Engines Without Balance Shaft...
Page 376: ...Figure 9 Engine Lubrication Diagram Engines With Balance Shaft...
Page 399: ...V2974...
Page 410: ......
Page 412: ...195 196 201 174 252 163 165 164 244 3706r3924...
Page 452: ......
Page 454: ...163 164 V1202...
Page 456: ...20 21x 302 210 4 0 41 2 5 2 5 1 2 51 4 2 e3 54 3 9 252 252 S 255 255 25 6 256 209 V1196...
Page 458: ...100 1 8 4 185 183 177 v 75 201 3706r1204...
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Page 512: ...V2131...
Page 514: ...110 106 106 103 90 93 89 88 87 86 v 7 7 7 7 j A _ 111 f t 2 a a s 53 49 L 47 46 3706r4751...
Page 516: ...259 260 150 237 S lM 180 167180 J 1 82 183 170 169 1 1 78 1 7 9 213212 2 0 7 205 r i 3706r4752...
Page 566: ...NOTES...
Page 574: ...NOTES...
Page 618: ...SPECIAL TOOLS...
Page 620: ...NOTES...
Page 672: ......
Page 682: ......
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Page 694: ...RH0213 4L60 E...
Page 695: ...657 659 m i J 8092 H J 34196 4 3 34196 5 657 658 665 J 23907 J 7004 1 J 8092 RH0214 4L60 E...
Page 696: ...J 8092 J 34196 4 33 31 J 8092 RH0215 4L60 E...
Page 697: ...SPECIAL TOOLS...
Page 698: ...SPECIAL TOOLS...
Page 758: ...RH0194 4L80 E...
Page 764: ......
Page 770: ...SPECIAL TOOLS...
Page 771: ...SPECIAL TOOLS CONT...
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Page 785: ......
Page 804: ...NOTES...
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Page 822: ...3707r5079...
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Page 848: ...NOTES...
Page 852: ......
Page 860: ...F5435...
Page 866: ......
Page 878: ...F9167...
Page 882: ...16 FrontOutputShaft 18 DrivtQNr 19 DrivenGm t 20 DriveChain 22 FrontOutputBearing V2836...
Page 890: ...F9168...
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