VALVE AND INJECTOR OPERATING MECHANISM - EXHAUST VALVES MAINTENANCE INSTRUCTIONS.

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TM-55-1905-219-14-4 Landing Craft Utility (LCU) 1667 Class Boston Hull Numbers 1667-1670 NSN 1905-00-168-5764 Manual

VALVE AND INJECTOR OPERATING MECHANISM - EXHAUST VALVES MAINTENANCE INSTRUCTIONS-cont.

TM 55-1905-219-14-4

3-33. VALVE AND INJECTOR OPERATING MECHANISM - EXHAUST VALVES

MAINTENANCE INSTRUCTIONS.

a. The valve and injector operating mechanism is located on the cylinder head.

b. Several operations may be performed on the valve and injector operating mechanism without removing

the cylinder head from the block. These operations are:

(1) Rocker arm removal and installation.

(2) Rocker arm shaft or shaft bracket removal and installation. (Refer to paragraph 3-33.1).

(3) Fuel injector removal and installation.

c. It is also possible to remove or replace a push rod, push rod spring, spring seats or cam follower

without removing the cylinder head. However, these parts are more easily changed from the lower side of the

cylinder head when the head is off the engine. (Refer to paragraph 3-33.1).

d. Several operations may be performed on the exhaust valve mechanism without removing the cylinder

head from the block. These operations are:

(1) Valve clearance adjustment. (Refer to paragraph 3-33.2).

(2) Exhaust valve bridge adjustment.

(3) Valve spring removal and installation. (Refer to paragraph 3-33.2).

(4) Exhaust valve bridge or bridge guide removal and installation. (Refer to paragraph 3-33.2).

e. In addition, the following operations require removal of the cylinder head. These operations are:

(1) Remove and install exhaust valves. (Refer to paragraph 3-33.2).

(2) Remove and install exhaust valve guides. (Refer to paragraph 3-33.2).

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