TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 553 of 1275

TM9-2350-311 -20-1

5-17 ENGINE RIGHT EXHAUST MANIFOLD AND CROSSOVER TUBE — CONTINUED

a. Removal — Continued

1

2

3.

4

5

Remove two nuts (1) from two clamps (2) securing exhaust crossover tube (3) to right exhaust manifold (4) and

left exhaust manifold (5). Slide clamps onto manifolds.

Loosen five locking nuts (6), securing right exhaust manifold (4) to side of cylinder head.

Remove exhaust crossover tube (3) from exhaust manifolds (4 and 5). Slide right exhaust manifold (4) upward

and off cylinder head. Remove clamp (2) from manifold.

NOTE

Engine model 7083-7391 has five beveled washers and no end retainers.

Remove five locking nuts (6), three beveled washers (7), and two end retainers (8) from studs (9) on right

cylinder head. Discard locking nuts.

Remove exhaust manifold gasket (1 O). Discard gasket.

b. Installation

Ensure engine and exhaust systems are cool enough to permit handling in order to

prevent bums or injury.

Engine exhaust manifold may slip or fall during installation. Assistance is required

to prevent injury to personnel.

NOTE

Engine model 7083-7391 has an unidirectional exhaust manifold gasket that must be

installed with the mark ‘TOP” facing outward and at the top.

1 Position new gasket (10) over exhaust manifold studs (9) on right cylinder head.

NOTE

Position beveled washers with crown facing nut.

Engine model 7083-7391 has five beveled washers and no end retainers.

2 Install three beveled washers (7), two end retainers (8), and five new locking nuts (6) on right exhaust manifold

studs (9).

5-32

WARNING