Section III. CYLINDER HEADS

TM 5-4110-217-14

(181) and gear assembly (153-2) remove the

c. Installation

cylinder head (para 5-13) and valve assemblies (para 5-

(1) When pressing a camshaft gear(15b-

14). Remove the operating plunger (107) for the breaker

2)onto the camshaft (181), be sure the gear is started

points (102). Remove the fuel pump (para 3-27) and

straight and that the key (181A) is properly , 1 place.

tappets (168)

Install the governor cup assembly to the g( i before

(3) The camshaft may be pressed out of the

installing the camshaft and gear assembly in the engine

gear (153-2) by use of a hollow tool or pipe which will fit

(2) Each timing gear (153) Is stamped With an

over the camshaft center pin (179). Do not press on the

O mark near the edge The gear teeth of the gear set

center pin or damage it in any way. The governor ball

must mesh so that these marks coincide exactly when

spacer is a press fit to the camshaft gear.

the gears are Installed in the engine (fig 5-13) Be sure,

when installing the camshaft gear (153-2) and shaft

assembly (181) that the thrust washer (154) is properly In

place behind the camshaft gear (153-2) Replace the

plate(156) and lock ring(155)to the crankshaft (199).

(3) Reassemble governor cup, gear cover, and flywheel

(para 5-9 thru 5-11).

5-13. Oil Pump.

a. Removal.

(1) Remove flywheel and gear cover (para 5-9

& 5-10).

(2) Remove two screws (183) and washers

(184), fig. 3-11, holding pump assembly (182) to engine

and replace complete pump assembly, if worn.

b. Installation (fig. 5-14). Oil the pump to prime it

before reinstalling. Use a new gasket. Replace oil pump

intake cup, if necessary Reinstall gear cover and

flywheel (para 5-9 & 5-10).

Figure 5-14. Oil Pump (Model RMP-J/1-10G).

Section III. CYLINDER HEADS

5-14. General.

The cylinder head forms a removeable, shaped cover for

the combustion chamber.

5-15. Cylinder Head.

CAUTION

Do not remove heads when they

are hot. Warpage may occur.

a. Removal (fig. S-11).

(1) Disconnect ignition cable (220 & 221) from

spark plug (84). Remove spark plug and gasket (85).

(2) Remove nine bolts (163, 165), and

washers (164) that attach cylinder head (161) to

crankcase (162).

(3) Remove cylinder head (161) and gasket

Figure 5-15. Cylinder Head Bolt Tightening Sequence

(166). Discard gasket.

(Model RMP-J/1 -l10G)

5-9