TM-9-2910-226-34
PUMP, FUEL, METERING AND DISTRIBUTING, ASSEMBLY
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT, MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
JUNE 1974
TM-9-2910-226-34 - Page 33 of 208
TM 9-2910-226-34
1-20. Operation.
The operation is described in
relation to oil lubrication, fuel flow, fuel pumping
and distribution, fuel metering and control speed
governing, fuel density compensating, and timing
advancement.
1-21. Oil Lubrication.
NOTE
The key letters shown in parentheses refer to
figure 1-23 except where otherwise indicated.
a.
Oil enters under pressure from the engine at the
pipe-to-tube tee (fig. 1-1) and flows to the timing
device housing and through the oil hose assembly to
the injection pump housing bushing type bearings
(L). The remaining internal parts of the advance unit
assembly are splash lubricated by oil in the advance
unit housing oil sump (K).
b.
On code A, B, C, D, and E injection pumps, oil
entering the injection pump housing flows up the
main oil passage (D) to lubricate the tappet
assembly (E).
c.
Code F and G injection pumps have an ad-
ditional oil passage. Oil entering the injection pump
housing flows up the main oil passage (D) to the oil
filter (C). Filtered oil flows to the lower section of the
fuel plunger (A) and to the gear thrust washer (B).
Oil flows from the main passage (D) to lubricate the
tappet assembly (E).
d.
A hole in the camshaft bushing type bearing
(J) allows oil to flow from the main oil passage to
lubricate the camshaft journal. A passage in the
journal allows oil to flow through the camshaft oil
passage (H). There are no oil passages in the friction
drive spider. The weight pins are equipped with
nylon type bearings which do not require lubrication.
Oil flows through the camshaft oil port (F) to
lubricate the sliding sleeve.
e.
The camshaft lobes, camshaft ball bearing,
quill shaft drive gears and internal governor parts
are splash lubricated by oil collected in the bottom of
the injection pump.
Oil drains back from the
governor housing and pump housing through the
timing device housing and returns to the engine
crankcase.
f.
Code F injection pumps may have an additional
oil drain (G) on the governor housing that returns oil
through an external line to the oil pan.
g.
Early code G injection pumps have an oil
passage (M) through the camshaft and friction drive
spider to governor weight pins
and bronze
bushings. Later code G pumps have teflon bushings
and do not require this lubrication.
1-25
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