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Wear or improper adjustment.

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15y ago
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Q: What causes valve lash noise?
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are you sure is a valve noise?? or is a piston slap?


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What is the purpose of doing a valve lash adjustment on a Geo Tracker?

the cheaper cars, have no hydraulic valve lifters. (solids are way cheaper) as a motor starts the metal expanded (all if it and at different rates) the expansion make the valve stick open hot. this causes the lifters to hold the valve open all the time , causing them to glow red hot. to solve this issues. they invented valve lash , on all otto cycle engine for 100 years. called VALVE LASH or VALVE tip clearance. this lash must never be zero or interference at TDC . it must be loose (LASH) as the spark fires, and both valves closed 100% not 99%. the hydraulic lifters solve these issues by being automatic. they compensate for engine expansion. try wiki it has the whole history of this engine.


What is valve lash?

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