Section III. Removal of Engine Components

*TM 9-2815-213-34

NOTE

gear teeth with a crocus cloth dipped in dry. cleaning

Special application studs have a nylok

solvent or mineral spirits paint thinner.

insert for sealing the threaded opening.

e. Bushings and Bushing-type Bearings. When

The nylok insert end of the stud is in-

bushings and bushing-type bearings are damaged or

serted in the casting.

worn beyond the limits specified in paragraph 3-174,

(3) Oversize studs. Only 0.003-inch oversize studs

generally the mating parts with which they are used must

are furnished for field replacement of studs in aluminum

also be replaced. Reference to (1) and (2) below will be

castings. If a standard stud requires replacement, install

made in the rebuild section for the particular part when

a 0.003-inch oversize stud. For identification purposes,

replacement of bushings and bushing-type bearings is

0.003-inch oversize studs are dipped in red dye.

required.

NOTE

(1) Removal. Remove bushings or bushing-type

Studs may have a coarse thread on one

bearings by pressing out part with suitable arbor press or

end and a fine thread on the other end.

with the special tools provided.

The coarse thread end must enter the

(2) Installation. Clean repaired parts thoroughly

aluminum casting. Studs having coarse

before assembly or installation. Aline bushing or bushing-

threads on both ends are used in

type bearing in casting or retaining cage and press into

particular applications and normally the

place with a suitable arbor press or with the special tools

short threaded end is in the casting.

provided.

Special application studs have a nylok

(3) Reaming. The bushing-type bearings in oil pump

insert for sealing threads of studs. The

must be finish reamed after installation to size specified

nylok insert end of stud is inserted in

in repair and rebuild standards. All other bushing-type

casting. Marking on coarse thread end

bearings are machined for proper clearance and do not

of stud determines when stud is

need reaming.

standard or oversize. All replacement

f. Oil Seals. Oil seals must be replaced when thin

studs have a special coating and must

feather edge is damaged or when seal material has

have a small amount of mica-base anti-

become hard or brittle.

seize compound applied on threads

(1) Removal. Press or pry damaged oil seal from

before the stud is installed in casting.

casting or housing, being careful not to damage bore in

Install replacement stud into opening

casting or housing.

slowly to prevent overheating.

(2) Repair. When oil seal bore in casting is burred or

d. Gears.

damaged to a point where an oil-tight seal is impossible,

(1) Replace all cracked gears.

replace casting. Remove slight nicks, burs, and

(2) Replace all gears which do not conform to

scratches from bore in casting with crocus cloth dipped

tolerances specified in repair and rebuilt standards,

in dry-cleaning solvent or mineral spirits paint thinner.

paragraph 3-174.

(3) Installation. Install new oil seal in bore of casting

(3) Replace gears having worn, pitted, or galled

or adapter, using a suitable oil seal replacer tool.

teeth. Remove sharp fins and burs from

Section III. Removal of Engine Components

tems, (i.e., cooling, fuel, electrical, drive, intake, exhaust,

2-8. General

hydraulic, and air, that are externally attached to the

a. Removal and Installation. The instructions for

engine).

removal and installation of engine components have

c. Internal Components. Internal components are

been arranged in the most logical order of removal for

defined as the units and assemblies within the engine

complete engine disassembly. Installation in general,

block and oil pan, the cylinder heads and associated

shall be the reverse order of the removal instructions. To

parts, and block.

facilitate the removal, and later disassembly, assembly

2-9.

Engine Preparation

and installation procedures, the components are

separated into categories, (i.e., external components,

NOTE

and internal components).

Check to insure that coolant and lube oil

b. External Components. External components are

has been completely removed from

defined as the basic units of the engine sys-

engine.

2-3