Cylinder Head Assembly: Service and Repair

NOTE: If a cylinder head is to be replaced, transfer all valves, springs, spark plugs, etc., to the new cylinder head. Clean and inspect all parts, and reface the valves. Check all assembly clearances before assembling the new or used parts to the new cylinder head.

Removal
1. Remove the intake manifold and carburetor as an assembly.
2. Remove the rocker arm cover(s).
3. If the Right Hand cylinder head is to be removed, remove the alternator and air pump mounting bracket bolt and spacer. Swing the alternator down and out of the way. Remove the air cleaner inlet duct from the Right Hand cylinder head assembly.
If the Left Hand cylinder head is being removed, remove the bolts fastening the air conditioning compressor bracket at the front of the cylinder head, remove oil dipstick and tube assembly and speed control bracket, if so equipped.
4. Disconnect the exhaust manifold(s) from the muffler inlet pipe(s).






5. Loosen the rocker arm fulcrum bolts so that the rocker arms can be rotated to the side. Remove the push rods in sequence so that they may be installed in their original positions.
6. Disconnect the Thermactor air supply hoses at the check valves and plug the check valve.
7. Install the cylinder head holding fixtures. Remove the cylinder head attaching bolts and lift the cylinder head off the block. Remove and discard the cylinder head gasket.

Installation
1. Clean the cylinder head, intake manifold, valve rocker arm cover and cylinder head gasket surfaces. If the cylinder head was removed for a cylinder head gasket replacement, check the flatness of the cylinder head and block gasket surfaces.

CAUTION: A specially treated composition gasket is used. DO NOT apply sealer to a composition gasket.

2. Position the new cylinder head gasket over the cylinder dowels on the block. Position the cylinder head on the block and install the attaching bolts. Remove the holding fixtures.

Fig. 5 Cylinder Head Bolt Tightening Sequence.:

3. The cylinder head bolts are tightened in two steps. Tighten all the bolts in sequence to:
^ First step 75-88 N-m (55-65 ft-lbs).
^ Second step 88-97 N-m (65-72 ft-lbs).
When cylinder head bolts have been tightened following this procedure, it is not necessary to re-tighten the bolts after extended operation. However, the bolts may be checked and re-tightened if desired.
4. Clean the push rods in a suitable solvent. Blow out the oil passage in the push rod with compressed air. Check the ends of the push rods for nicks, grooves, roughness, or excessive wear. Visually check the push rods for straightness or check push rod runout with a dial indicator. If runout exceeds the maximum limit at any point, discard the rod.

CAUTION: Do not attempt to straighten push rods.

5. Lubricate the end of the push rods with Ford Polyethylene Grease or equivalent and install them in their original positions. Apply Ford Polyethylene Grease or equivalent to the valve stem tips.
6. Lubricate the rocker arms and fulcrum seats with Ford Polyethylene Grease or equivalent, then install the rocker arms.
7. Position a new gasket(s) on the muffler inlet pipe(s), if so required. Connect the exhaust manifold(s) at the muffler inlet pipe(s). Tighten the nuts to 34-52 N-m (25-38 ft-lbs).
8. If the Right cylinder head was removed, swing the air pump into position and install the alternator attaching bolt and spacer, and the air cleaner inlet duct on the Right Hand cylinder head. Adjust the drive belt tension.
If the Left Hand cylinder head was removed, install the air conditioning compressor bracket, if so equipped, at the front of the cylinder head. Install the oil dipstick and tube assembly and speed control bracket, if so equipped.
9. Clean the valve rocker arm cover and cylinder head gasket surfaces. Place the new gaskets in the covers making sure that the tabs of the gasket engage the notches provided in the cover. Install the valve rocker arm cover(s).
10. Install the intake manifold and related parts.
11. Reconnect the air supply hose to the air pump, unplug the check valve and connect the Thermactor air supply hose.