Lister Petter TR1, Workshop Manual

Page: 39 / 121

page 39
Section 02
Engine Servicing and Adjustments
- governor
Dismantling the Governor
1. Remove the gear end cover.
2. Remove the fuel pump inspection door/s.
3. Disconnect the fuel pump and governor linkage at
the fuel pump using long nosed pliers.
4. Slacken off the speed control screw and then
disconnect the speeder spring.
5. Remove both fulcrum pins from the pivot support
blocks using a 1.5mm rod, punch or suitable piece
of stiff wire.
Take care not to lose the shims.
6. Remove the governor lever assembly complete with
the speeder spring and fuel pump linkage.
7. Remove the governor sleeve assembly
Assembling the Governor
Assemble the governor and fuel pump linkage in
the reverse order to dismantling, taking care to note
the following points:
a. The fulcrum pins are drilled at one end only and
these holes must be fitted at the outer end.
b. Ensure the governor sleeve is fitted the correct
way.
c. The speed control spring is correctly hooked
into its spigot.
d. The small return spring, which is only fitted to
variable speed engines, must be fitted to the
fuel pump side end of the lever assembly with
the short tail wound backwards and held captive
under the pivot support block.
Figure 2.30.1 Variable Speed Return Spring
e. Check that the governor lever assembly is
perfectly free to move.
Changing Governor Weights
A table of governor weight and spring combinations
is given in "Governing Ranges to BS5514". Current
engines are fitted with an improved camshaft gearwheel
design, the weights remain the same although on
current engines they are retained in position by sintered
retaining plates with cast slots which locate over the
weight pins. Both types are shown in 'Figure 2.30.2'
and they are not interchangeable.
1. Remove the gear end cover.
2. Remove the governor lever and sleeve assemblies.
3. Disconnect the speeder spring from its spigot and
fit a new spring if necessary.
4. Turn the engine until one of the governor weight
retaining plate bolts is accessible.
5. Remove the bolt and plate.
6. Turn the engine until the adjacent retaining plate
bolt is accessible.
7. Remove the governor weight.
8. Repeat items 4. to 7. for the remaining weights.
Figure 2.30.2 Governor Weights - TS/TR
A - Early TS/TR
B - Later TS/TR and TX
9. Fit the new weights and retaining plate; take care
to ensure the weight pins are correctly seated in
their respective slots.
10. Torque the retaining plate bolts to 9.0Nm (6.5lbf ft).
11. Replace the governor sleeve and governor lever
assemblies.
12.Check the governor settings.
13.Replace the fuel pump inspection door and the end
cover.