FUEL INJECTOR TEST/REPLACEMENT

TM 10-3930-673-34

WARNING

Fuel is very flammable and can explode easily. To avoid serious injury or death:

Keep fuel away from open flame or any spark (ignition source).

Keep at least a B-C fire extinguisher within easy reach when working with fuel or on

a fuel system.

Do not work on fuel system when engine is hot; fuel can be ignited by a hot engine.

Post signs that read "NO SMOKING WITHIN 50 FEET (15 m)" when working with

open fuel, fuel lines or fuel tanks.

Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Use only

with effective chip guarding and personal protective equipment (goggles/shield,

gloves, etc.).

(1)

Clean area of cylinder head around injectors (1) with a soft brush and low pressure

compressed air.

CAUTION

If rust has formed on injector hold-down nut, injector can turn in its bore as hold-down

nut is loosened. Dissolve and loosen rust as instructed in Step (2). Failure to follow

instructions in Step (2) can result in severe damage to cylinder head.

(2)

If necessary, apply rust penetrating solvent to injector hold-down nut (2) and allow

solvent to remain for a minimum of three minutes. Then tap against injector body with

hammer and drift pin to loosen rust.

(3)

Hold injector (1) with wrench while turning hold-down nut (2) out of injector bore.

(4)

Remove injector (1), preformed packing (3), and copper injector seal (4) from engine (5).

Discard preformed packing washer and copper injector seal.

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