GM Metro/Sprint 1985-1993 Repair Guide



See Figure 1

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Fig. Fig. 1: Overall view of the engine compartment

The engine is a water-cooled, in-line three cylinder, four stroke cycle gasoline unit with a direct acting type overhead camshaft (OHC) valve configuration.

The cylinder head is made of cast aluminum alloy and has three combustion chambers arranged in-line. Each combustion chamber has an intake and exhaust port.

The overhead camshaft is mounted over the cylinder head. It is driven from the crankshaft through a timing belt; no push rods are used in the valve train system. The camshaft opens and closes the valves directly.

The cylinder block is made of cast aluminum alloy and has three cylinder arranged in-line. A cylindrical cast iron sleeve is installed in each cylinder.

A monoblock casting crankshaft is supported by four main bearings which are of the precision insert type. Three crank pins on the crankshaft are positioned 120 degrees apart.

The piston is cast aluminum alloy. The piston pins are chromium steel and have a floating fit in the pistons. They are retained in the connecting rods by a press fit. The connecting rods are made of forged steel and rod bearings are of precision insert type.