Perkins L4 Workshop Manual - L-36 Fleet
Perkins L4 Workshop Manual - L-36 Fleet
Perkins L4 Workshop Manual - L-36 Fleet
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Certain <strong>L4</strong> engines are equipped with a mechanical<br />
governor in place of the pneumatic governor.<br />
This governor is set and adjusted before the engine<br />
leaves the factory and no further adjustment<br />
shouid be necessary.<br />
Any settings and adjustments which may be<br />
necessary, as when the engine has undergone a<br />
major overhaulor the fuel pump has been removed,<br />
should only be carried out by trained personnel.<br />
Instrucûons tor adjusÛDg Mechanical Governor.<br />
To carry out the Collowing instructions it will be<br />
necessary to remove the cover, situated at the<br />
front of the govemor, and the govemor housing<br />
rear cover.<br />
Preliminary Settings.<br />
1. Ensure that the governor weights move<br />
freely when operated with the finger. If they are<br />
stiff it is probably due to distortion set up in the<br />
weight carrier when holding screws are tightened.<br />
To correct this it will be necessary to remove<br />
carrier plate and see tbat tbe rear face is clean and<br />
free from dirt. See also that tbe front of the fuel<br />
pump gear is clean and free from dirt.<br />
2. Hold the stop controllever on the fuel pump<br />
in the stop position and screw in tbe idling spring<br />
control screw until the spring is coil bound, i.e.,<br />
until adjustment of the screw just begins to move<br />
tbc stop control lever. Wben this position is<br />
FIG. T<br />
FIG. T2<br />
CT)<br />
reached, unscrew adjusting screw oDe turn. The<br />
idling spring control screw is situated at the rear<br />
of the fuel pump (See Fig. T .3).<br />
3. Reduce ten sion on mainspring with control<br />
lever in ruil speed position.<br />
4. Set eccentric spring anchorage to innermost<br />
position (R. Min. See Fig. T.l).<br />
5. Place govemor lever in the idle position,<br />
press toes of forked lever on to sleeve tbrust race<br />
and adjust fuel pump actuating lever until this is.<br />
clear of fuel pump push rad by ,tç in. (1.59 mm)<br />
when fuel pump control rad is at maximum fuel<br />
position (See Fig. T.2).<br />
Allen key 5/32 in. across flats is required to<br />
unlock and lock fuel pump actuating lever.<br />
See that, by moving the weights to the outermost<br />
position, the fuel purup control rad moves to the<br />
point of no fuel (within ,tç in. (1.59 mm) of total<br />
control rad movement).<br />
Test Bed Procedure.<br />
A. Start engine and warm up to 160°F. (71°C.),<br />
water and oil.<br />
B. Set engine to rated load and speed. lt win<br />
he necessary to increase the main spring ten sion
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