Section 6A1 · Pages 293–328 (36 pages)

2.5 Liter L4 Engine

From the 1987 Chevrolet Light Duty Truck Unit Repair Manual

Bench overhaul of the GM 2.5L inline four: overhead valves, cast-iron block and head, five main bearings with thrust at the rear, a gear-driven camshaft on three bearings and roller hydraulic lifters. Disassembly runs from accessories, manifolds, thermostat housing and water pump through the valve train, head, pulley hub, oil pan, oil pump driveshaft, front cover, pistons, flywheel and crankshaft. Cleaning, inspection and repair covers the block, manifolds, camshaft and bearings, front cover, pump, valve train, head and crankshaft, followed by step-by-step assembly and engine set-up and testing.