engine is a single over head camshaft with hydraulic
lifters and four valves per cylinder design (Fig. 1).
The engine does not have provisions for a free wheel-
ing valve train.

The cylinders are numbered from front of the

engine to the rear. The firing order is 1–3–4–2.

The engine identification number is stamped onto

a machined pad located on the left rear of the cylin-
der block bedplate (Fig. 2).

Fig. 1 2.0L SOHC Engine

9 - 2

2.0L SOHC ENGINE

CYLINDER BLOCK AND BEDPLATE

DESCRIPTION

The cast iron cylinder block is a two-piece assem-

bly, encompassing the cylinder block and bedplate.
The bedplate incorporates the main bearing caps and
bolts to the cylinder block. This design offers a much
stronger lower end and increased cylinder block
rigidity. The rear oil seal retainer is integral with the
block. The bedplate and block are serviced as an
assembly.

CRANKSHAFT

DESCRIPTION

The crankshaft is made of nodular cast iron and

includes five main bearing journals and four connect-
ing rod journals (Fig. 4). The number three journal is
the location for the thrust bearing. The mains and
connecting rod journals have undercut fillet radiuses

that are rolled for added strength. To optimize bear-
ing loading, eight counterweights are used.

OPERATION

The crankshaft transfers force generated by com-

bustion within the cylinder to the flywheel or flex-
plate.

PISTON AND CONNECTING ROD

DESCRIPTION

NOTE: The engine DOES NOT have provisions for a
free wheeling valve train. Non free wheeling valve
train means, in the event of a broken timing belt,
pistons will contact the valves.

The pistons are made of a cast aluminum alloy.

The pistons have pressed-in pins attached to forged
powdered metal connecting rods. The pistons pin is
offset 1 mm (0.0394 in.) towards the thrust side of
the piston. The connecting rods are a cracked cap
design and are not repairable. Hex head cap screws
are used to provide alignment and durability in the
assembly. The pistons and connecting rods are ser-
viced as an assembly

OPERATION

The piston and connecting rod is the link between

the combustion force to the crankshaft.

Fig. 2 Engine Identification—2.0L

1 – ENGINE IDENTIFICATION LOCATION

Fig. 3 Cylinder Block and Bedplate

1 – CYLINDER BLOCK
2 – BEDPLATE

Fig. 4 Crankshaft

1 – MAIN BEARING JOURNALS
2 – COUNTER BALANCE WEIGHTS

2.0L SOHC ENGINE

9 - 3

DESCRIPTION AND OPERATION (Continued)

CYLINDER HEAD

DESCRIPTION

The cross flow designed, aluminum cylinder head

contains a single over head camshaft with four valves
per cylinder (Fig. 5). The valves are arrange in two
in-line banks. The intake valves face toward the
front of the vehicle. The exhaust valves face the dash
panel. The cylinder head incorporates powdered
metal valve guides and seats. The cylinder head is
sealed to the block using a head gasket and retaining
bolts.

The rocker arm shafts mount directly to the cylin-

der head. The rocker arms shafts are hollow, provid-
ing

lubrication

passages

the

hydraulic

lash

adjusters, camshaft, and valve mechanisms.

OPERATION

The cylinder head closes the combustion chamber,

allowing the pistons to compress the air/fuel mixture
for ignition. The valves are actuated by the lobe pro-
files on the camshaft to open and close at specified
duration to either allow clean air in the combustion
chamber or the exhaust gases out; depending on the
stroke of the engine.

CAMSHAFT

DESCRIPTION

The camshaft is made of nodular iron with five

bearing journal surfaces and three cam lobes per cyl-
inder. Provision for a cam position sensor is provided
on the rear of the camshaft. The camshaft position
sensor bolts to the rear of the cylinder head and also

Fig. 5 Cylinder Head Assembly

1 – ROCKER SHAFT RETAINING BOLT
2 – VALVE RETAINING LOCKS
3 – VALVE
4 – VALVE SPRING
5 – VALVE SEAL AND VALVE SPRING SEAT ASSEMBLY
6 – SPARK PLUG TUBE SEAL
7 – CAMSHAFT
8 – ROCKER ARM SHAFT RETAINER SPACER
9 – GASKET

10 – SPACER
11 – INTAKE ROCKER ARM/HYDRAULIC LASH ADJUSTER

ASSEMBLY

12 – EXHAUST ROCKER ARM/HYDRAULIC LASH ADJUSTER

ASSEMBLY

13 – CAMSHAFT SEAL
14 – RETAINER SPACER
15 – VALVE SPRING RETAINER

9 - 4

2.0L SOHC ENGINE

DESCRIPTION AND OPERATION (Continued)

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