Engine Idle Speed, Buffer Screw and Buffer Switch Adjustment-continued

TM 9-2815-224-34&P

Engine Tune-Up Instructions (Cont)

Install air intake ducting (TM 9-2320-279-20).

(12)

When told by Soldier A, Soldier B starts engine and operates for 15 minutes.

(13)

CAUTION

Do not increase engine speed more than 15 rpm with buffer screw or buffer switch.

Excessive engine speed can damage engine components.

Soldier A turns buffer screw (12) or buffer switch (0.2) and locknut (4) until it contacts

(14)

differential lever (13) as lightly as possible and still remove engine roll. Soldier B remains in cab.

CAUTION

Maximum engine speed cannot exceed 2325 rpm. Excessive engine speed can

damage engine components.

When told by Soldier A, Soldier B increases engine speed to maximum engine speed and notes

(15)

rpm reading.

Release throttle and let engine return to idle.

(16)

(17)

Soldier A holds buffer screw (12), or buffer switch (0.2), tightens locknut (4), and tells Soldier B

to stop engine.

NOTE

Perform step (17.1) for Model B and Model C buffer switches.

(17.1) Connect wires (0.1), as tagged during removal, to buffer switch (0.2)

19-25

Change 2