Jeep 1987 Wrangler Workshop Manual page 235

ENGINES
GENERAL INFORMATION
GENERAL INFORMATION
The 2.46 liter (150 CID) four-cylinder engine and
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the 4.2 liter (258 CID) six-cylinder engine are
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in-line, lightweight, overhead valve engines. N
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Both engines are designed for unleaded fuel. E
s
The cylinder heads have dual quench-type
combustion chambers that create turbulence
and fast burning of the air/fuel mixture, which
results in good fuel economy. "
The cylinders in the four-cylinder engine are
numbered 1 through 4 from front to rear. The
firing order is 1 -3-4-2.
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 line-bored
bearings.
The cylinders in the six-cylinder engine are
numbered 1 through 6 from front to rear. The
firing order is 1 -5-3-6-2-4.
The crankshaft rotation is clockwise, when
viewed from the front of the engine. The
crankshaft rotates within seven main bearings
and the camshaft rotates within four line-bored
bearings.
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