New Tapping Noise
06-30-2005, 06:43 AM
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New Tapping Noise after starting nd driving for two minutes or so i get a loud tapping at all rpm's. But after the engine gets to operating temp, or driving for 15-20 minutes it stops and the sewing machine noise resumes. Could this be a sticking lifter or valve?
06-30-2005, 10:34 AM
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DONT SAY PISTON SLAP!!!!!!!!!!!!!!!!!!!!! ive heard that before and it doesnt sound like what i a m having. Would changing the oil help a sticking lifter? Are there any additives i could put in to help them?Any ideas on what would be the best lifters to put in my engine with my current setup?
06-30-2005, 12:15 PM
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Sorry to sound stupid, but what is a "sticking lifter"? Wouldn't the spring pressure be strong enough to hold the lifter on the cam lobe? Or are you talking about the lifter plunger? Thanks...
06-30-2005, 01:48 PM
#7
"Sticking lifter" is probably a misnomer. They are called hydarulic lifters because they use oil pressure to keep the seat where the pushrod rides against the lifter in a pumped-up position. Inside the lifter are a series of discs with very small orifices and there is also a spring. The spring alone cannot handle the pressure applied to the lifter by the valve springs and so if the orifices become restricted by a piece of contaminant, oil will not flow in and out of the lifter properly and the lifter will not adjust properly and will let the rocker arm clatter. I think that's what they're talking about when they refer to a sticking lifter. If that ain't it, I dunno.