The ticking gets faster as the car accelerates and is fastest in park. Also there is usually no ticking when first started; it has to be warmed up a little. Friend says I have a leek in the doughnut in the manifold. What do you think? If so I checked an autoparts store for the doughnut and they said they had 3 different kinds. Which doughnut do I get and how do I remove the manifold to get at the doughnut? Its really a 1979 mercury Zephyr 6 cylinder.
Loose tappets normally. They sit in the cylinder head on the rockers between the camshaft push-rods and the valves and are adjusted to bring the gap between the rocker and the valve to the manufacturers spec. Too much gap and the valves do not open properly, restricting fuel intake / exhaust gas purging. Too little gap and the valves will not close properly and can burn out. Mechanical tappets can be adjusted, hydraulic ones are eventually changed if the tapping gets too bad. There is a third type called bucket and shim but quite rare these days an the adjustment is complicated. Less likely is a sticking valve; a condition where, for a number of reasons, a valve does not close properly leaving a big gap between the rocker and the valve with consequent ticking and normally a loss of power.
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