Engine Component Description. Chevrolet Corsica 1996

For 1990-2009 cars

#### Engine Block

The engine block is cast iron. The engine block has four cylinders arranged in-line. The engine block is a one piece casting. The cylinders are encircled by coolant jackets.

#### Cylinder Head

The cylinder head is cast aluminum. The cylinder head has sintered powdered metal valve guides and valve seats. The rocker arms are retained on individually threaded studs.

#### Crankshaft

The crankshaft is cast nodular iron. Five crankshaft bearings support the crankshaft. The bearings are retained by bearing caps. Number four crankshaft bearing also serves as the crankshaft thrust bearing. The bearing caps are machined with the block for proper alignment and clearances. The bearing caps are retained by two bolts each. Four connecting rod journals are spaced 90° apart. There is one connecting rod on each journal.

#### Piston and Connecting Rod Assemblies

The pistons are cast aluminum. The pistons use two compression rings and one oil control ring assembly. The piston is a low friction, lightweight design with a flat top and barrel shaped skirt. The piston pins are chromium steel. They have a floating fit in the piston and are retained by a press fit in the connecting rod. The connecting rods are forged steel. The connecting rods are machined with the rod cap installed for proper clearances and alignments.

#### Camshaft

The camshaft is steel. The camshaft is supported by four bearings pressed into the engine block. The camshaft timing chain sprocket mounted to the front of the camshaft is driven by the crankshaft sprocket thorough a camshaft timing chain.

A spiral gear machined into the camshaft near the rear journal drives a shaft assembly which operates the oil pump drive assembly.

#### Valve Train

The LN2 valve train is a ball pivot type. Motion is transmitted from the camshaft through the hydraulic roller valve lifters and the tubular pushrods to the valve rocker arms. The valve rocker arm pivots on a ball in order to open the valve. The hydraulic valve lifters keep all the parts of the valve train in constant contact.

The valve rocker arm stud retains the valve rocker arm ball with a locking nut. The valve rocker arm stud is threaded into the cylinder head.

The valve rocker arm is positioned and retained on the valve rocker arm stud with a specific locking nut, lash is net build.

#### Intake Manifold

The intake manifold is a two-piece cast aluminum unit. The fuel rail, and injector pods are integrated into the intake manifold. The throttle body is integral with the upper half of the intake manifold.

#### Exhaust Manifold

The exhaust manifold is cast iron.