TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 157 of 1275

TM9-2350-311-20-1

e. ENGINE

The engine is an internal combustion, liquid-cooled, diesel engine with an exhaust-driven turbocharger. The engine is

the main component of the vehicle drivetrain and has many components and associated wiring. The relationship of the

engine and these components is shown below in the pictorial diagram.

The engine is started by turning on the MASTER switch which supplies voltage from the batteries through the MASTER

relay. When the START button is pushed, voltage is supplied to the starter which cranks and starts the engine. Once

started, the engine can develop up to 405 horsepower at 2350 rpm and deliver this power to the transfer assembly. The

transfer assembly then sends this power to the transmission.

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