The Chrysler Industrial Engine which provides the power for the Siren, is a 90 degree inclined, V-type with overhead valves, developing 180 brake horsepower at 4000 R.P.M. and 312 foot pounds torque at 2000 R.P.M. One of the most outstanding features of the Engine, is the. hemispherical combustion' chambers located in the cylinder heads. This type of combustion chamber plus the lateral valve arrangement provides the maximum amount of space for extra large valves and permits direct and unrestricted exhaust and intake porting.

An important feature is the relation of the bore and stroke - 3 13/16 x 3 5/8" - which contributes to a smooth power output. Compression ratio is 7.5 to 1. Cylinders are numbered from front to rear as follows: Right bank 2-4-6-8 Left bank 1-3-5-7. These cylinders fire in 1-8-4-3-6-5-7-2 order.

Five large, precision-type main bearings support the crankshaft. The camshaft is also supported by five precision-type bearings. Mounted on the front end of the crankshaft is a torsional vibration damper.

Positive lubrication to all moving parts is provided by a gear-driven rotary type oil pump, a full-flow filter cleans the oil before it circulates through the Engine.

Operation of the improved lateral valve arrangement is by means of hydraulic tappets, through push rods and rocker arms, providing the maximum amount of space for extra large valves. Each valve has two springs, one inside the other. This prevents spring flutter and insures positive valve closing at all times.

The rocker arms are mounted on parallel shafts. Oil, under pressure, flows through passages in those shafts to lubricate the entire valve train. The hydraulically operated valve tappets provide efficient operation and require no special attention.

The following text is provided as a guide in performing such routine operations as can be handled by the Siren Operator, as well as containing condensed maintenance information.

In order to maintain the original high standard of performance of the Chrysler Engine, only competent mechanics having access to suitable tool equipment, should be assigned to perform any major repairs.

If the facilities of the user are not adequate, it is recommended that the Service Department of the nearest Chrysler Dealer be consulted or write to the Chrysler Marine and Industrial Engine Division, 2000 Van Horn Road, Trenton, Michigan.