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


1 Regardless of whether or not the head was sent away for repair work of any sort, make sure that it is clean before beginning reassembly. Be sure to remove any metal particles and abrasive grit that may still be present from operations such as valve grinding or head resurfacing. Use compressed air, if available, to blow out all the oil holes and passages.

2 Beginning at one end of the head, lubricate and install the first valve. Apply molybdenum disulphide-based grease or clean engine oil to the valve stem, and refit the valve. Where the original valves are being re-used, ensure that each is refitted in its original guide. If new valves are being fitted, insert them into the locations to which they have been ground.

3 Fit the plastic protector supplied with new valve spring lower seat/stem oil seals to the end of the valve stem, then put the new seal squarely on top of the guide, and leave it there; the action of refitting the valve spring presses the lower seat/stem oil seal into place (see illustration).

8.3 Valve spring pressure is sufficient to seat lower seat/stem oil seals on
8.3 Valve spring pressure is sufficient to seat lower seat/stem oil seals on reassembly

4 Refit the valve spring and upper seat.

5 Compress the spring with a valve spring compressor, and carefully install the collets in the stem groove. Apply a small dab of grease to each collet to hold it in place if necessary (see illustration). Slowly release the compressor, and make sure the collets seat properly.

8.5 Apply a small dab of grease to each collet before installation - it will
8.5 Apply a small dab of grease to each collet before installation - it will hold them in place on the valve stem until the spring is released

6 When the valve is installed, place the cylinder head flat on the bench and, using a hammer and interposed block of wood, tap the end of the valve stem gently, to settle the components.

7 Repeat the procedure for the remaining valves. Be sure to return the components to their original locations - don’t mix them up!

8 Refit the hydraulic tappets (Part A of this Chapter, Section 13).


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