Question about 1993 Mazda 323
Tappets dont squeak .. you want to hope the noise is coming from an ageing or loose fan belt .. if it is really coming from inside the valve cover then it could be a blocked oil passage that lubs the cam and its bearings ..this would soon cause a major engine failure .. other possibilities .. a bad bearing in the idler pully, water pump or alternator (a drop of oil on those can help identify the failing bearing) ... also at times the distributor can cause noise if its bearings run dry .. there is a really neat stethoscope like tool that allows you to listen to various parts and places to locat the problem .. but be careful playing around a running engine (no ties, long hair, necklaces .. if its the fan belt then it will likely make more noise as the engine is accelerating .. turning the lights on might increase or change the noise .. a leaky vacuum hose can cause a whistle like sound. .
Posted on Jul 13, 2009
Valve tappets can squeak. I'm dealing with one now - on a Triumph 650 mc engine. because the rocker rotates on a spindle it must travel slightly across the valve head as it depresses and releases the valve - unless there's so much play in the guide that the rocker can carry the valve on it's little sideways excursion. If there's not enough lubricant on the valve head and the top of the valve has lost it's polish it can squeak loud. In my case a tiny spray with wd solves the problem for an hour or so, but I'm still trying to figure out a low budget permanent fix - which is why I'm here.
Posted on Aug 07, 2009
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Posted on Jan 02, 2017
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