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mysterious clicking noise, cam question 1800

uid 4846's pic
posted by  JohnMc on  Thu Oct 26 09:26 CST 2006
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last visit: Thu Oct 23 07:42 CST 2014
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Get out a ruler and measure how far each valve goes up when open. The total amount isn't so important, but any valve that is shorter than the rest means you'll need a new cam and lifters in short order.

Usually, by the time they make nose they are well on their way to going out.

If they are all even, then it's possible that something is slowly going wrong at the front end of the cam. Either the gears are getting worn, or the thrust plate is getting worn. When the valves are engaged, the cam undergoes back and forth torque at the gear. It pushed each lifter up the cam lobe, and then past the lobe 'TDC' valve pushes the cam forward. So any slack in the valvetrain goes back and forth at idle, making clicking, clunking sometimes rather scary noises. Typically, noises there will go away as the engine is revved up - eventually the cam goes into a constant pull as the valves rebound more weakly and the oil pump gets harder to turn.
--
'63 PV544 rat rod, '93 Classic 245 + turbo






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