Page 173 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

12 Replace castellated nut (1), tighten securely and then insert split pin.
13 For approximately 5 cc of oil into the oil filter hole in the drive end shield. Allow sufficient time lubricating pad
to absorb the oil then replace the lubricating plug. Wipe off any surplus oil which may have run into the inside
the drive end shield

14 Fit solenoid switch (15) to commutator end shield and secure in position with fixing screws (14)
15 Reconnect the solenoid winding leads to their respective terminals
16 Fit commutator end shield to yoke ensuring that the dowel in the yoke is correctly located
17 Replace screws (16) securing the main field coil ends, positive terminal connector and auxiliary field connections
to the solenoid switch.
18 Assemble armature and drive end shield to yoke
19 Replace fixing bolts (5) and tighten
20 Spin the armature to see it is not blinding and is free to rotate
21 Fix washers and nut (26) to armature plunger and tighten

22 Replace brushes (30) taking care that each brush is replaced in its original position. If the new brushes are
also to be fitted they must be bedded to the commutator as described in the section head maintenance
23 Connect brush leads and auxiliary field leads to the brush gear

24 Check that the relationship between trigger and tripping disc. Is covered by pulling the armature forwards until
the trigger is raised to its highest extend by the tripping disc. When the trigger is raised there should be an
ample gap between the shoulder on the trigger and the button of the slot in the catch plate.
Testing of starter motor
Engagement mechanism test
1 Connect the starter to a battery
2 Insert a strip of insulating material between the moving contact and the second stage contact of solenoid
switch to prevent the second stage contacts of solenoid switch to prevent the second stage contacts closing
3 Operate the starter push switch. The fist stage contact of the solenoid switch should close and the pinion
should revolve in its normal directions of rotation. At the same time the pinion should move forward for a
distance of approximately on inch (25.4mm)

Caution
Do not keep the starter button depressed longer than is necessary to check that the starter is
functioning satisfactorily otherwise winding may be a damaged by overheating

4 Remove insulating strip from the second stage contact.
Performance tests
• Fit the starter to a starter test rig and connect the power supply. The out of mesh clearance between the starter
pinion and test rig wheel must be set at 3.4mm
• Check the lock torque, the running torque the light running current and RPM at specified voltage. Refer Test
Data for value
Insulation Test

Using test probes connected to a 110 volts (maximum) supply mains and in series with a 15 watt lamp of suitable
voltage check the insulation of the machinery between
i Positive terminal and frame and

ii Negative terminal and frame (for insulated version only)

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CITS : Automotive - Mechanic Diesel - Exercise 9.3