Engine: Description and Operation
DESCRIPTIONThe 2.5 liter (150 CID) four 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 4 from front to rear. The firing order is 1-3-4-2 (Fig. 1).
The crankshaft rotation is clockwise, when viewed from the front of the engine. The crankshaft rotates within five main bearings and the camshaft rotates within four bearings.
The engine Build Date Code is located on a machined surface on the right side of the cylinder block between the No.3 and No. 4 cylinders (Fig. 2).
The digits of the code identify:
- 1st Digit - The year (8 = 1998).
- 2nd & 3rd Digits - The month (01-12).
- 4th & 5th Digits -- The engine type/fuel system/compression ratio (HX = A 2.5 liter (150 CID) 9.1:1 compression ratio engine with a multi point fuel injection system).
- 6th & 7th Digits - The day of engine build (01-31).
FOR EXAMPLE: Code * 801HX23 * identifies a 2.5 liter (150 CID) engine with a multi point fuel injection system, 9.1:1 compression ratio and built on January 23, 1998.