Oil Lubrication.

TM 9-2910-226-34

1-20. Operation. The operation is described in

d. A hole in the camshaft bushing type bearing

relation to oil lubrication, fuel flow, fuel pumping

(J) allows oil to flow from the main oil passage to

and distribution, fuel metering and control speed

lubricate the camshaft journal. A passage in the

governing, fuel density compensating, and timing

journal allows oil to flow through the camshaft oil

advancement.

passage (H). There are no oil passages in the friction

drive spider. The weight pins are equipped with

1-21. Oil Lubrication.

nylon type bearings which do not require lubrication.

NOTE

Oil flows through the camshaft oil port (F) to

The key letters shown in parentheses refer to

lubricate the sliding sleeve.

figure 1-23 except where otherwise indicated.

e. The camshaft lobes, camshaft ball bearing,

a. Oil enters under pressure from the engine at the

quill shaft drive gears and internal governor parts

pipe-to-tube tee (fig. 1-1) and flows to the timing

are splash lubricated by oil collected in the bottom of

device housing and through the oil hose assembly to

the injection pump. Oil drains back from the

the injection pump housing bushing type bearings

governor housing and pump housing through the

(L). The remaining internal parts of the advance unit

timing device housing and returns to the engine

assembly are splash lubricated by oil in the advance

crankcase.

unit housing oil sump (K).

f. Code F injection pumps may have an additional

b. On code A, B, C, D, and E injection pumps, oil

oil drain (G) on the governor housing that returns oil

entering the injection pump housing flows up the

through an external line to the oil pan.

main oil passage (D) to lubricate the tappet

g. Early code G injection pumps have an oil

assembly (E).

passage (M) through the camshaft and friction drive

c. Code F and G injection pumps have an ad-

spider to governor weight pins and bronze

ditional oil passage. Oil entering the injection pump

bushings. Later code G pumps have teflon bushings

housing flows up the main oil passage (D) to the oil

and do not require this lubrication.

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).

1-25