Engine: Description and Operation

DESCRIPTION - ENGINE BLOCK





The cylinder block is a cast iron inline six cylinder design. The cylinder block is drilled forming galleries for both oil and coolant (Fig. 1).

DESCRIPTION - ENGINE
The 4.0 Liter (242 CID) six-cylinder engine is an inline, lightweight, overhead valve engine.
This engine is designed for unleaded fuel. The engine cylinder head has dual quench-type combustion chambers that create turbulence and fast burning of the air/fuel mixture. This results in good fuel economy.





The cylinders are numbered 1 through 6 from front to rear. The firing order is 1 - 5 - 3 - 6 - 2 - 4 (Fig. 2).
The crankshaft rotation is clockwise, when viewed from the front of the engine. The crankshaft rotates within seven main bearings. The camshaft rotates within four bearings.

BUILD DATE CODE





The engine Build Date Code is located on a machined surface on the right side of the cylinder block between the No. 2 and No. 3 cylinders (Fig. 3).
The digits of the code identify:
- 1st Digit - The year (0 = 2000).
- 2nd & 3rd Digits - The month (01 - 12).
- 4th & 5th Digits - The engine type/fuel system/compression ratio (MX = A 4.0 Liter (242 CID) engine with a multi-point fuel injection system).
- 6th & 7th Digits - The day of engine build (01 - 31).
1. FOR EXAMPLE: Code *001MX12* identifies a 4.0 Liter (242 CID) engine with a multi-point fuel injection system, and built on January 12, 2000.