Sudden Lifter Noise

[WhiteGP]

Thats Interesting !! Good Info, Thanks

Well looks like your right, 3.23 is the lowest so that settles that !! Not really worth the $$$

 

[Challenger RTA]

lifters not getting enough oil to pump up

Did you test the lifters. Just off the top of my head. Place the lifter in oil and push on the lifter with a push rod.

Testing hydraulic lifters typically involves measuring their leak-down rate to determine if they are functioning correctly.

To perform a leak-down test, the lifter is placed in a tester cup filled with light oil or distillate, and a weighted ram is used to push the plunger down while a timer measures how long it takes for the pointer to move across a scale. A good used lifter should take between 5 and 60 seconds to leak down, while a new lifter should take between 10 and 60 seconds; a leak-down rate that is too fast indicates a worn plunger or leaking check valve, while a rate that is too slow suggests the plunger is sticking.

If a lifter fails to test within these specifications, it should be discarded and replaced. Additionally, hydraulic lash adjusters can be bled of air by working them in a container of clean distillate to remove air bubbles and provide limited cleaning, though a noisy adjuster that remains noisy after bleeding will need to be renewed
It typically takes 2 to 5 pumps to manually prime a new hydraulic lifter, though some sources suggest compressing the lifter 20 to 30 times if it has been soaking in oil. The process should be done slowly to allow air bubbles to escape and oil to fill the chamber, ensuring the lifter becomes firm like a solid rod.

• Manual Priming: Compress the lifter using a pushrod or tool while submerged in oil to remove trapped air.
• Self-Filling: If not manually primed, hydraulic lifters will usually pump up automatically within 10 to 30 minutes of engine idling.
• Completion Sign: The lifter is considered pumped up when it offers no resistance and feels completely hard to compress.

If a lifter remains soft after these efforts, it may be faulty, clogged with debris, or the oil passages may be restricted.

 

[Xcudame]

A spun connecting rod bearing makes a tap tap sound that changes with RPM.