Ford 2M5Z-6507-AA Valve - Inlet

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Set the engine to TDC on cylinder No 1 by ensuring that the inlet and exhaust cam lobes of No 1 cylinder are pointing upwards (though not vertical), allowing for the valve clearances to be checked.

1. Scrape away all traces of old gasket material and sealing compound from the cylinder head. 2. Scrape away the carbon from the combustion chambers and ports, then wash the cylinder head thoroughly with a suitable solvent. 3. Scrape off any heavy carbon deposits that may have formed on the valves, then use a power-operated wire brush to remove deposits from the valve heads and stems.

5. If adjustment is needed, change the shim thickness by depressing the cam follower, removing the old shim, and fitting a new one. 6. Before changing a shim, lower the piston for the relevant cylinder from its TDC position by turning the crankshaft approximately 90° clockwise to avoid the risk of bending the valve. 7. Dealer technicians use service tool 303-563A, which is bolted onto the cylinder head above each camshaft using two of the camshaft bearing cap bolt locations. A spacer may be required to allow the tool to be bolted onto the head. 8. Take care not to scratch or damage the cam follower and its housing. Remove the shim with a small screwdriver or magnetic probe, then slowly release the pressure applied to the tool. Do not rotate the camshaft while a shim is removed. 9. Record the thickness of the shim, which is engraved on the side facing away from the camshaft. If the marking is missing or illegible, a micrometer will be needed to establish shim thickness.