Figure 2-45. Adjusting valve clearance

Figure 2-48. Removing filter base plate gasket

TM-9-2320-211-20 Truck Chassis: 5-Ton 6x6 M39 M39A2 M40 M40A1 M40A2 M40A1C M40A2C M61 M61A1 M61A1 M61A2 M63 M63A1 Manual
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103

TM 9-2320-211-20

(c) Tape the elbow and tee intake manifold

Remove the tape from the elbow and tee

(a)

openings to prevent excessive air leakage which would

openings of the intake manifold.

cause improper engine idle.

(b) Connect the distributor ventilation line (11,

c. Valve Clearance Adjustment.

fig. 2-44) to the tee.

(1) Start the engine and check the temperature gage

(c) Connect the vacuum line to the elbow.

to be sure that the engine coolant is still at normal

(6) Connect the vacuum line (2, fig. 2-43) to the

operating temperature.

crankcase ventilating shutoff valve (4, fig. 2-43).

(2) With the engine idling, insert the feeler gage

(7) Start the engine, and check the cylinder head

between the valve stem cap (fig. 2-45) and the valve

cover area for oil leaks.

2-46. Oil Filters.

actuating ball socket at each valve to check for proper

a. Filter Elements.

clearance. Clearance should be .018 inches for intake and

(1) Removal.

.024 for exhaust.

(a) Remove the plugs (fig. 2-46) and let the oil

(3) If the clearance is incorrect, using a wrench and

screwdriver, loosen the valve-adjusting screw jamnut

drain into a suitable container.

(b) Unscrew the nuts (fig. 2-46) retaining the

(fig. 2-45), and turn the adjusting screw (clockwise to

covers to the filter housings. Remove the covers and

decrease, counterclockwise to increase) until proper

springs.

clearance is obtained.

(4) Hold the screw in the adjusting position, tighten

the jamnut, and again check the clearance.

(5) Repeat (2), (3), and (4) above until all valves are

adjusted to the recommended clearance.

(6) Stop the engine.

Figure 2-46. Removing oil filter element.

(c) Pull the elements out of the housings

(fig. 2-46). Discard the elements and cover gaskets.

(2) Installation.

(a) Use a drycleaning solvent or spirits paint

thinner to clean out the inside of the filter housings and

covers.

Figure 2-45. Adjusting valve clearance.

(b) Install the drain plugs.

(c) Place the new elements (fig. 2-46) inside the

d. Valve Rocker Cover Installation.

filter housings.

(1) Position a new cover gasket and secure the

(d) Add oil to the filters and the engine (LO 9-

cover to the cylinder head with three capscrews (8,

2320-211-12).

fig. 2-44 and washers.

(e) Position the filter cover springs on top of the

(2) If both covers were removed, repeat step (1)

elements.

above to install the other cover.

(f) Position the filter covers with new gaskets on

(3) Position two new crankcase ventilation line

top of the housings, and secure the covers with nuts

connector gaskets, and secure the connector to the studs

(fig. 2-46).

with four lockwashers and nuts. Tighten the nuts.

(g) Run the engine until operating temperature is

(4) If the engine has a crankcase ventilating shutoff

reached, and check the filters for leaks.

valve (4, fig. 2-43), push the fording valve control handle

b. Filter Housings.

in.

(1) Removal.

(5) If the engine has no ventilating shutoff valve,

(a) Follow the procedures described in a(1) above

proceed as indicated in steps (a), (b), and (c) below.

for removal of the filter elements.

2-77

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