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(8) Disconnect accelerator linkage and if so equipped, the speed control and transmission kick- (9) Remove distributor cap and wires. (Refer to 9 - ENGINE/CYLINDER HEAD/CYLIN- (14) Remove intake manifold (Refer to 9 - ENGINE/MANIFOLDS/INTAKE MANIFOLD - REMOVAL) and throttle body as an assembly. Dis- (15) Remove exhaust manifolds (Refer to 9 - ENGINE/MANIFOLDS/EXHAUST MANIFOLD - REMOVAL). (16) Remove rocker arm assemblies and push rods. Identify to ensure installation in original locations. (17) Remove the head bolts from each cylinder head and remove cylinder heads. Discard the cylin- (18) Remove spark plugs. CLEANING Clean all surfaces of cylinder block and cylinder heads. Clean cylinder block front and rear gasket surfaces using a suitable solvent. INSPECTION Inspect all surfaces with a straightedge if there is any reason to suspect leakage. If out-of-flatness 0.00075mm/mm (0.0001in./in.) times the span length in any direction, either replace head or FOR EXAMPLE:—A 305 mm (12 in.) span is 0.102 mm (0.004 in.) out-of-flat. The allowable out-of- The cylinder head surface finish should be 1.78-3.00 microns (70-125 microinches). Inspect push rods. Replace worn or bent rods. INSTALLATION (1) Clean all surfaces of cylinder block and cylin- der heads. (2) Clean cylinder block front and rear gasket sur- faces using a suitable solvent. (3) Position new cylinder head gaskets onto the cylinder block. (4) Position cylinder heads onto head gaskets and cylinder block. (5) Starting at top center, tighten all cylinder head bolts, in sequence (Fig. 6). CAUTION: When tightening the rocker arm bolts, (6) Install push rods and rocker arm assemblies in their original position. Tighten the bolts to 28 N·m (7) Install the intake manifold (Refer to 9 - ENGINE/MANIFOLDS/INTAKE MANIFOLD - INSTALLATION) and throttle body assembly. (8) Install exhaust manifolds (Refer to 9 - ENGINE/MANIFOLDS/EXHAUST MANIFOLD - INSTALLATION). (9) If required, adjust spark plugs to specifications. Install the plugs and tighten to 41 N·m (30 ft. lbs.) (10) Install coil wire. equipped, the speed control and transmission kick- (15) Install the fuel supply line (Refer to 14 - FUEL SYSTEM/FUEL DELIVERY/QUICK CON- NECT FITTING - STANDARD PROCEDURE). (16) Install the generator and drive belt (Refer to 7 - COOLING/ACCESSORY DRIVE/DRIVE BELTS - (17) Install the intake manifold-to-generator bracket support rod. Tighten the bolts. (18) Place the cylinder head cover gaskets in posi- tion and install cylinder head covers (Refer to 9 - HEAD/CYLINDER HEAD COVER(S) - INSTALLATION). (19) Install closed crankcase ventilation system. Fig. 6 Cylinder Head Bolt Tightening Sequence 9 - 232 ENGINE 5.9L AN CYLINDER HEAD (Continued) |