REMOVAL & INSTALLATION
The engine should be overnight cold before the cylinder head is removed to prevent warpage.Inline 6-Cylinder Engine
- Disconnect the negative battery cable.
- Drain cooling system. Remove air cleaner and disconnect the PCV hose.
- Disconnect accelerator pedal rod at the bellcrank on the manifold, the fuel and the vacuum lines at the carburetor.
- Disconnect the exhaust pipe at the manifold flange, then remove the manifold bolts, the clamps, the manifolds and the carburetor as an assembly.
- Remove the fuel and the vacuum line retaining clip from the water outlet. Disconnect the wiring harness from the temperature sending unit and the coil, leaving the harness clear of the clips on the rocker arm cover.
- Disconnect the radiator hose at the water outlet housing and the negative battery cable from the cylinder head.
- Disconnect the wires and remove the spark plugs.
- Remove the rocker arm cover, then back off the rocker arm nuts. Pivot the rocker arms to clear the pushrods and remove the pushrods.
- Remove the cylinder head bolts, the cylinder head and the gasket.
- Using a gasket scraper, clean the gasket mounting surfaces.
- Using a new gasket, position the head on the block. Oil the cylinder head bolts and install them. Torque the cylinder head bolts a little at a time using the torquing sequence.
- Install the pushrods. Pivot the rocker arms over the pushrods, then tighten the rocker arm nuts.
- Adjust the valves.
- Install the rocker arm cover.
- Install the spark plugs and wires.
- Connect the radiator hose at the water outlet housing and the negative battery cable at the cylinder head.
- Install the fuel and vacuum line retaining clip at the water outlet. Connect the wiring harness at the temperature sending unit and the coil.
- Install the manifolds and the carburetor as an assembly. Connect the exhaust pipe at the manifold flange.
- Connect accelerator pedal rod at the bellcrank on the manifold, the fuel and the vacuum lines at the carburetor.
- Fill cooling system.
- Install air cleaner.
- Connect the PCV hose.
- Connect the negative battery cable.
- Remove the intake manifold.
- Remove the alternator's lower mounting bolt and move the unit aside.
- Remove the exhaust manifolds, the rocker arm covers and the rocker arm assemblies. Remove the pushrods.
- As required, remove the air injection manifold assemblies. Drain the cooling system.
- Remove the diverter valve, if equipped. Remove the cylinder head bolts and the cylinder heads from the engine.
- Installation is the reverse of the removal procedure.
- Clean the cylinder head bolts and coat the threads with RTV sealant.
- Be sure to use new gaskets or RTV sealant, as required. Torque the cylinder head bolts to specification and in the proper sequence.
CLEANING & INSPECTION
Chip carbon away from the valve heads, combustion chambers, and ports, using a chisel made of hardwood. Remove the remaining deposits with a stiff wire brush.
Be sure that the deposits are actually removed, rather than burnished. Have the cylinder head hot-tanked to remove grease, corrosion, and scale from the water passages. Clean the remaining cylinder head parts in an engine cleaning solvent. Do not remove the protective coating from the spring.
Place a straightedge across the gasket surface of the cylinder head. Using feeler gauges, determine the clearance at the center of the straightedge. If warpage exceeds 0.003 in. in a 6 in. span, or 0.006 in. over the total length, the cylinder head must be resurfaced.
If warpage exceeds the manufacturer's maximum tolerance for material removal, the cylinder head must be replaced. When milling the cylinder heads of V-type engines, the intake manifold mounting position is altered, and must be corrected by milling the manifold flange a proportionate amount.
This procedure should only be performed by a machine shop.