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Sec. 4
Page 74
GM COACH MAINTENANCE MANUAL
AIR COMPRESSOR AND GOVERNOR
3. If a new lower valve is being installed,
tapping the valve to its seat before grinding is
usually helpful.
To do this, place lower valve in
governor body, then install upper valve and upper
valve guide in body.
Then, using seating tool
(BWE-211397)
and a light hammer,
lightly tap
valve to its seat a few times.
Grind valve to its
seat as directed in step 2 above.
Thoroughly
clean valve and governor body in cleaning fluid
after grinding.
If lower valve leakage cannot be
corrected by the above procedure, the complete
governor must be replaced.
GOVERNOR ASSEMBLY (Fig. 26)
1.
Extreme cleanliness of bench, hands, tools,
and governor parts is important.
2.
Install lower valve spring (11) and lower
valve (12) in recess in governor body.
Install
shims (7) in body, being sure to use same thick-
ness of shims as were removed.
3. Insert upper valve stem (13) through upper
valve guide (5) and thread upper valve guide into
body.
Tighten guide firmly.
4. Install adjusting screw (3) and lock nut (2)
in adjusting screw bracket (4) and install bracket
on end of tube (1). Tighten screw attaching bracket
to tube firmly.
5.
Pack
cylindrical
strainer
with new or
cleaned lamb's wool and place screen in strainer
body.
Place cup strainer screen over end of cy-
lindrical screen in strainer body, then install cap
nut in strainer body.
Thread strainer assembly
into lower opening in governor body.
6. Adjust governor as previously directed
un-
der "Adjustment," and test as previously directed
under "Tests" in this section.
7. If governor passes all tests, remove strain-
er and install governor assembly in case. Attach
with four screws and lock washers. Install cover
on case and attach with screw and lock washer.
8.
Thread air strainer into lower opening in
governor body and tube connection into upper op-
ening. Tighten firmly, with air strainer positioned
as shown in figure 26. Plug both openings against
entrance of dirt during installation.
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