SERVICE MANUAL
ROBERT BOSCH MODEL MW INJECTION PUMP
Section 11
BARREL AND PLUNGER
Components
One barrel and plunger assembly for each engine
cylinder mounts to the injection pump housing. Each
barrel flange which contains two slotted holes is
positioned over two pump housing studs and is secured
with two flat washers, lock washers and nuts. Threaded
into the top of the barrel is the delivery valve holder
(Figure 10).
The delivery valve gasket, delivery valve, delivery valve
spring and washer are installed
into the upper barrel bore prior to the installation of the
delivery valve holder. An "O" ring on the delivery valve
holder acts as a dust seal to prevent foreign material or
liquids from entering the delivery valve holder threads.
When the injection pump is assembled, shims are
inserted around the number one housing studs and
between the pump housing and number one cylinder
barrel flange to establish the specified plunger lift to port
closure. These shims are available in various
thicknesses.
Figure 10. - Barrel and Plunger Components
CGES-185-3
PRINTED IN UNITED STATES OF AMERICA
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