R

original staking

Visually inspect the carrier and key screws for looseness and proper staking. Do not attempt to retorque if there is no loosening of the screws indicated by the staking marks.

note:

surface "a" must not inoicate distortion or damage which impairs parallelism.

note:

surface "a" must not indicate any loss of parallelism. a maximum of 0 025 inch protrusion in an upward direction is permissible.

T I1 surface a

field replacement staking

0.025 max

Inch Key Socket Headscrew

revised staking

NOTE

Surface "A" must not indicate distortion or damage which impairs parallelism.

Surface "A" must not indicate any loss of parallelism. A maximum of 0.025 inch protrusion in an upward direction is permissibie.

socket head screw socket wrench attachment

Torque Wrench Socket Head Screws

torque wrench key and bolt carrier assembly

Repair by replacing screws and torquing carrier and key screws and restaking. Using the socket head screw wrench attachment and torque wrench, torque the carrier and key screws to 35 to 40 inch pounds.

torque wrench

Do not reuse old screws. New screws must be used at assembly.

3-20

location item action remarks

Use vise jaw caps, machinist's vise, solid center punch, and hand hammer to stake the two carrier and key screws in three places.

Field staking method will be used by field units.

vise jaw caps machinists vise

CAUTION

Extreme care must be exercised during the following procedure to assure that the striking force is not directed to the attaching screws and that the tube portion is not enlarged or flared beyond original requirements. Such enlargement would permit loss of gas pressure when the key and gas tube come together during functioning.

b. Key Inspect for burrs, breaks, or bends.

Repair small dents and/or distortions using fabricated key tool (E-4, app E) as follows:

Place the key and bolt carrier assembly in a vertical position, supported so that contact is made with the rear surface of the key.

Insert the small end of the key tool (E-4, app E) into the tube portion of the key.

Strike the large end of the key tool {lightly) with a 3-ounce, soft-brass hammer.

Repeat striking (gently) until the carrier key is reformed to original configuration.

M16a1 Naming The Parts

solid center punch

KEY AN D BOLT CARRIER ASSEMBLY

M16a1 Naming The Parts

bench

KEY TOOL — CARRIER KEY

bench

3-21

TM 9-1005-249-24&P

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