CHAPTER 4. REPLACEMENT OF ENGINE ACCESSORIES, COMPONENTS AND RELATED SERVICE OPERATIONS

CHAPTER 4

REPLACEMENT OF ENGINE ACCESSORIES, COMPONENTS

AND RELATED SERVICE OPERATIONS

S e c t i o n l. GENERAL

4-1.

Purpose

reference

other

pertinent

operations

per-

formed in this technical manual.

the

manual

covers

This chapter

replacement of engine

accessories,

and

removal

Note. Parts mentioned in the instructions that

and

replacement

components

in-

accompany the operational sequence letters will

spection,

adjustment

and

service

operations

be called out separately on the illustration only

allocated to Direct Support maintenance per-

when required to further clarify the instructions,

sonnel. Some accessories, engine components or

Special Instructions.

service operations can be accomplished while

(1) "Notes and Cautions". Instructional

engine is installed in vehicle, but is dependent

"Notes" or "Cautions" accompany some of the

upon how accessible the item is. Engines which

illustrations and are used to further define the

have been removed from the vehicle for ac-

instructions, eliminate procedures that might

replacement should be thoroughly

cessory

result in the equipment being damaged, or injury

cleaned before replacement of accessory is at-

to personnel.

tempted. Refer to pertinent technical manuals

(2) Cleanliness.

Extreme

care

must

for instructions on the removal or installation of

exercised to insure that dust and dirt, even in

the power plant and separation of the trans-

minute quantities, does not enter the engine.

mission from the engine.

Plug or cover all fuel and oil line connections to

Removal

and

Installation

In-

4-2.

prevent entry of dirt. Clean parts thoroughly and

structions

coat all surfaces of bearings, shafts and contact

a. Illustrations. The illustration sequences

surfaces with engine oil (OE). Surface must be

provided in the following subparagraphs depict

protected

from

dirt

after

oiling.

the procedure for removal or installation of a

(3) G a s k e t s . Always use new gaskets and

particular item or an adjustment and service

preformed packings when reinstalling engine

operation. When necessary, illustrations

components.

covering variations between engine models are

(4) Torque tightening attaching hardware.

included to clarify any differences in disassembly

All hardware must be torque tightened to

or assembly procedures.

When a torque value is not

specified limits.

b. Tables. This chapter has been grouped into

specified in the text or on an illustration, refer to

sections. Each section has a contents table for

Standard Torque Values, para 6-7. Special

easy reference for removing, cleaning, testing,

torque values are specified in the text and / or

installing

and

adjustment

procedures

required

illustrations.

Refer

also

Special

Torque

for a given operation and are listed by figure

Values, para 6-7.

number

under

appropriate

heading

the

table.

Note. Do not vary from torque specified.

c. I n s t r u c t i o n s . T h e s t e p - b y - s t e p p r o c e d u r e t o

Under-torquing will result in premature failure

be followed for removal, installation, ad-

of studs and bolts. Over-torquing can result in

justment,

service

operation

listed

im-

yielding of bolts and studs.

mediately

following

each

illustration.

d. Parts Identification. Callouts will be used

(5) Safety devices. All bolts and nuts must

to point out related parts involved in the removal

be secured with lock washers, lock nuts, tab

operation being performed. Callouts not

washers, locking wire or cotter pins, as specified.

mentioned

the

instructions

are

subsequent installation procedures or are used as

4-1