Delco 50-MT Starting Motor Assemble

Assemble the Starting Motor
Note: The following procedure is only for the 24 volt starting motor.
1.Lubricate the following items with SAE 20W oil: bushings, seals and oil wicks.


Illustration 1 g00705427

2.Put the field winding assembly (35) and pole shoes (34) in position in the starting motor housing. Install the twelve screws (37) and tighten to a torque of 20.3 ± 2.3 N·m (180 ± 20 lb in). Install the motor terminal (36), the washers and the nut. Tighten the nut to a torque of 30 ± 3 N·m (22 ± 2.0 lb ft).


Illustration 2 g00705400

3.Use a 1P-0510 Driver Gp to install the bushing (32) and the seal (33) into the shift lever housing .


Illustration 3 g00705073

4.Install the seals on the shaft (31). Position the shift lever assembly (28) into the shift lever housing. Use a 1P-1855 Retaining Ring Pliers to install the shaft (31) and the snap ring .

5.Install the O-ring seal and the gasket onto the shift lever housing. Set the shift lever housing assembly (29) onto the starting motor housing in the correct position. Install the seven bolts and tighten the bolts (30) to a torque of 12.2 ± 2.7 N·m (108 ± 24 lb in).


Illustration 4 g00704879
6.Use 5P-0960 Molybdenum Grease to lubricate the armature assembly bushing areas. Do not grease the armature core or the commutator.

7.Put the pinion drive assembly (27) into position in the fork of the shift lever. Put the spacer on the armature assembly (26). Install the armature assembly (26) into the starting motor housing and the shift lever housing. Slide the armature assembly (26) into the pinion drive assembly (27) .


Illustration 5 g00704875
8.Use a 1P-0510 Driver Gp to install the bushing (25) into the pinion drive housing (23) .


Illustration 6 g00704870

9.Slide the pinion drive housing assembly (23) onto the shift lever housing in the correct position. Install the six screws (24) and tighten to a torque of 20 ± 3 N·m (178 ± 27 lb in).


Illustration 7 g00704856

10.Position the insulator (22), the plate (21) and the brush holders onto the brush plate assembly. Install the screws (20) and tighten the screws .

Illustration 8 g00704842

11.Use a 1P-0510 Driver Gp in order to install the bushing (19) into the rear frame assembly (14) .


Illustration 9 g00705811

12.Install the O-ring seal (18) onto the rear frame assembly. Position the gasket onto the brush plate assembly (16). Put the washers and the insulator on the negative terminal.

13.Position brush plate assembly (16) onto the rear frame and install the three screws. Install the negative terminal insulator, the washers and the nut. Tighten the nut to a torque of 30 ± 3 N·m (22 ± 2 lb ft).

14.Install the brushes (15) with the brush springs against the side of each brush. Tighten the lead screw for the brushes to a torque of 2.9 ± 1.0 N·m (26 ± 8 lb in).


Illustration 10 g00705821

15.Put the washer onto the armature assembly. Position the rear frame assembly (14) over the commutator. Push the brushes (15) into the holders so that the springs are on top of the brushes.

16.Put the rear frame assembly against the starting motor housing in the correct position. Install the six bolts and tighten the bolts to a torque of 12.2 ± 2.7 N·m (108 ± 24 lb in). Connect the wire assembly to the negative terminal on the end frame assembly.


Illustration 11 g00705835

17.Connect the three field winding leads (38) to the brush plate assembly. Tighten the screws to a torque of 2.9 ± 1.0 N·m (26 ± 8 lb in). Install the three gaskets and plugs on the starting motor housing.


Illustration 12 g00706331

18.Install the washer, the retainer, the boot, the spring, the retainer and the ring onto the plunger.

19.Position the plunger assembly (10) into the shift lever housing. Install the nut finger tight. The plunger assembly will need to be adjusted for the correct pinion clearance after the starting motor has been completely assembled.


Illustration 13 g00706338

20.Position the solenoid (7) over the plunger assembly. Install the bolts (9) and tighten the bolts to a torque of 12.2 ± 2.7 N·m (108 ± 24 lb in). Tighten the clamp.

21.Install the contact assembly (6). Install the insulator, the lockwashers, the washers, the nuts and the gasket onto the terminal assembly. Tighten the small nuts to a torque of 2.25 ± 0.25 N·m (20 ± 2.2 lb in). Tighten the larger nuts to a torque of 30 ± 3 N·m (22 ± 2 lb ft).

22.Connect the leads (5) to the back of the terminal assembly (2). Install the terminal assembly, the bolts and the nuts onto the solenoid. Tighten the nuts to a torque of 2.25 ± 0.25 N·m (20 ± 2.2 lb in). Connect the negative wire assembly to the ground terminal. Tighten the nut to a torque of 30 ± 3 N·m (22 ± 2 lb ft).

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