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Cylinder head - dismantling
Engine removal and general engine overhaul procedures / Cylinder head - dismantling


Note: New and reconditioned cylinder heads are available from the manufacturers, and from engine overhaul specialists. Due to the fact that some specialist tools are required for the dismantling and inspection procedures, and new components may not be readily available (refer to Section 1 of this Part), it may be more practical and economical for the home mechanic to purchase a reconditioned head, rather than to dismantle, inspect and recondition the original head.

1 Remove the camshafts and hydraulic tappets (Part A of this Chapter, Section 13), being careful to store the hydraulic tappets as described (see illustration).

6.1 Cylinder head components
6.1 Cylinder head components

1 Hydraulic tappet
2 Valve collets
3 Valve spring upper seat 4 Valve spring
5 Valve spring lower
9 Inlet valve
10 Locating dowels
11 Exhaust valve
12 Cylinder head boltseat/stem oil seal 6 Oil-retaining valve
7 Engine lifting eye
8 Cylinder head gasket

2 Remove the cylinder head (Part A of this Chapter, Section 14).

3 Using a valve spring compressor, compress each valve spring in turn until the split collets can be removed. A special valve spring compressor will be required, to reach into the deep wells in the cylinder head without risk of damaging the hydraulic tappet bores; such compressors are now widely available from most good motor accessory shops. Release the compressor, and lift off the spring upper seat and spring (see illustrations).

6.3A Standard valve spring compressor modified as shown . . .
6.3A Standard valve spring compressor modified as shown . . .

6.3B . . . or purpose-built special version, is required to compress valve
6.3B . . . or purpose-built special version, is required to compress valve springs without damaging cylinder head . . .

6.3C . . . so that both valve split collets can be removed from the valveТs
6.3C . . . so that both valve split collets can be removed from the valveТs stem - small magnetic pick-up tool prevents loss of small metal components on removal and refitting

4 If, when the valve spring compressor is screwed down, the spring upper seat refuses to free and expose the split collets, gently tap the top of the tool, directly over the upper seat, with a light hammer. This will free the seat.

5 Withdraw the valve through the combustion chamber. If it binds in the guide (wonТt pull through), push it back in, and de-burr the area around the collet groove with a fine file or whetstone; take care not to mark the hydraulic tappet bores.

6 Ford recommend the use of their service tool 21-160 to extract the valve spring lower seat/stem oil seals; while this is almost indispensable if the seals are to be removed without risk of (extremely expensive) damage to the cylinder head, we found that a serviceable substitute can be made from a strong spring of suitable size. Screw on the tool or spring so that it bites into the seal, then draw the seal off the valve guide (see illustrations).

6.6A Ford service tool in use to remove valve spring lower seat/stem oil
6.6A Ford service tool in use to remove valve spring lower seat/stem oil seals . . .

6.6B . . . can be replaced by home-made tool if suitable spring can be found
6.6B . . . can be replaced by home-made tool if suitable spring can be found

7 It is essential that the valves are kept together with their collets, spring seats and springs, and in their correct sequence (unless they are so badly worn that they are to be renewed). If they are going to be kept and used again, place them in a labelled polythene bag or similar small container (see illustration). Note that No 1 valve is nearest to the timing belt end of the engine.

6.7 Use clearly-marked containers to identify components and to keep matched
6.7 Use clearly-marked containers to identify components and to keep matched assemblies together

8 If the oil-retaining valve is to be removed (to flush out the cylinder head oil galleries thoroughly), seek the advice of a Ford dealer as to how it can be extracted; it may be that the only course of action involves destroying the valve as follows. Screw a self-tapping screw into its ventilation hole, and use the screw to provide purchase with which the valve can be drawn out; a new valve must be purchased and pressed into place on reassembly (see illustration).

6.8 Cylinder head oil-retaining valve (arrowed)
6.8 Cylinder head oil-retaining valve (arrowed)


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