TM-9-2330-356-14

SEMITRAILER, TANK: 5000 GALLON, BULK HAUL, SELF LOAD/UNLOAD M967 AND M967A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, AUTOMOTIVE M969 AND M969A1; SEMITRAILER, TANK: 5000 GALLON, FUEL DISPENSING, UNDER/OVERWING AIRCRAFT M970 AND M970A1

TECHNICAL MANUAL; OPERATOR’S, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL

OCTOBER 1990

TM-9-2330-356-14 - Page 362 of 528

TM 9-2330-356-14

Figure 7-6. Governor System.

7-9.

Power Train (Flg. 7-7)

The power train includes the cylinder head and cylinder

block assemblies:

a.

Cylinder Head Assembly.

(1) The cylinder head assembly consists of the

intake and exhaust valves, valve springs, rocker arms,

shields, push rods, injection nozzles, and glow plugs.

(2) The valve lifters are driven by the camshaft,

and transfer motion to the intake and exhaust valves

through the push rods and the rocker arms.

(3) When the push rod moves down, the valve

spring forces the valve to close against the valve seat and

seal off the combustion chamber.

(4) The valve opening and closing is timed by the

camshaft gear and crankshaft gear. The sequence is as

follows:

(a)

Intake open, exhaust closed: Air is

drawn into cylinder while piston is moved down.

(b)

Intake closed, exhaust closed: Piston

moves upon compression stroke. Ignition occurs near top

dead center when fuel is injected.

(c)

Intake closed, exhaust closed: Piston

moves down on power stroke, transferring force to

crankshaft.

(d)

Intake closed, exhaust open: Piston

moves up, forcing burned gases out of open valve to

exhaust system.

7-6