Section 6A3 · Pages 425–454 (30 pages)

4.3 Liter V6 Engine

From the 1989 GMC Light Duty Truck Unit Repair Manual

Bench overhaul of the GM 4.3L, a 90-degree overhead-valve V6 with cast-iron block and heads, four main bearings with thrust at the rear and a chain-driven camshaft on four bearings. Disassembly covers the EGR valve, manifolds, rocker covers, valve train, heads, damper, oil pan and pump, front cover, camshaft, pistons, flywheel, rear oil seal and retainer, crankshaft, and main bearing removal without removing the crankshaft. Cleaning, inspection and repair takes in the block, pistons, camshaft and bearings, timing chain, pump, lifters and heads, then assembly, valve adjustment and engine set-up and testing.