ROBERT BOSCH MODEL MW INJECTION PUMP
REPLACING TIMING POINTER PLUG OR GASKET
The plug should be installed using Loctite hydraulic
sealant. The gasket can be re-used. (Figure 33)
ADJUSTING LOW IDLE SPEED
When the upper end of the control lever is moved fully
towards the governor housing, the control lever will
contact the low idle stop. The low idle speed
specification, with the engine at operating temperature, is
To adjust low idle speed, loosen locknut with a 10 mm
wrench and raise or lower low idle stop (bolt) with an 8
mm wrench (Figure 34).
Raise stop to increase speed, lower to decrease speed.
Tighten locknut when specified speed is reached. To
compensate for parasitic loads which affect low idle
speed, low idle speed should be set slightly higher so
engine speed will be within specifications when load is
applied. Examples of major parasitic loads are mixer
drums and automatic transmissions.
REPLACING OUTER THROTTLE CONTROL LEVER
The outer throttle control lever attaches to the injection
pump control shaft and is retained by a capscrew, spacer
washer, washer, lock washer and nut (Figure 35). The
spacer washer must be installed inside control lever slot
to prevent lever breakage. Torque capscrew to 55 lb-in.
Injection pump calibration is required if the inner control
dimensions vary sufficiently to affect pump calibration.
PRINTED IN UNITED STATES OF AMERICA