Page 263 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

The drive tendons of shaft must fit without any appreciable play in the corresponding recess of stop lever.
Air breather should be washed in petrol and ‘blown dry with compressed air.
The link fork or the stop pin should not be loose in the assembly. If necessary replace governor cover and link fork

Assembly
Thoroughly wash the repaired and the new parts in clean fuel oil. ‘Moving parts should be smeared with engine
oil SAE 30, prior to assembly.
Governor housing

If governor housing is removed (or replaced) it should be fitted with new gasket and tightened securely with
screws.
Measure camshaft projection on drive end with measuring bar . This dimension should be 9.8±0.5 mm. If necessary,
correct the projection by inserting shims.
Fix the end play measuring attachment together with dial gauge (0-10 mm- Least count 0.01 mm) to camshaft.
During this measurement, the roller tappets should be lifted off the camshaft with suitable tappet lifters. Exert a
steady axial pull on the attachment (Fig. 16) and set dial indicator to ‘0. Then exert a steady axial pressure on the
attachment and note down the reading.

Fig 16

Measuring camshaft and play

The camshaft end play values should be:

Ball bearings Taper roller bearings Corresponding ambient
temperature

0.03to0.13mm 0.02to0.06mm Around 20o C
0.07to0.17mm 0.06 to 0.10 mm Around 40°C

If ‘excessive end play’ or ‘no play’ exists, the cam- shaft should be removed and shims totalling at least 0.2 mm
thickness removed, as it is easier to measure accurately when some play exists.
Refit camshaft (avoid using grease since it influences the measurement).

Measure end play and if required add shims between spacer ring and bearing. Always compensate camshaft end
play on governor side so that the specified end play is obtained without affecting the camshaft projection.
Flyweight assembly
Before fitting the flyweight assembly the conical surface of the camshaft should be cleaned with kerosene/
turpentine and blown dry with compressed air.
Insert woodruff key into camshaft keyway and fix flyweight assembly with round nut
Tighten round nut to 50...60 N.m. (5...6 kgf.m) torque, using pin wrench .
Guide sleeve assembly
Proceed as follows to maintain a distance of 19+0.2 mm between the inner shoulder of actuating T of the guide
lever and the governor housing face with flyweights in closed position (Fig. 17-A).

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CITS : Automotive - Mechanic Diesel - Exercise 15.3