Collapsed lifter

[g1o1101]

So it seems I do have a collapsed lifter on my L99. I’m wondering if along with the collapsed lifter comes a misfire or do I might have a bigger problem on my hands? The car is completely stock aside from an exhaust.

['10CamaroDude]

That would be the lifter. A collapsed lifter has no hydraulic pressure being built up
inside, so the valve will not open all the way, and it makes noise.

Worn lifters, or excessively low oil pressure, will often produce a clacking or clicking
sound, especially during engine warmup.

The hydraulic lifters are lash adjusters. The valve may still be able to open and
close, albeit not fully, but the clicking or clacking is because the lash is higher.
The noise is the sound of metal hitting metal, because there is more more clearance
between contact points. The lash adjusters keeps everything tighter.

A collapsed valve is totally different. That means a couple of things. The spring is too
weak and it won't close. The valve end popped out of the spring cap, and it can fall
into the cylinder. There will be a definite miss with a collapse valve.

[g1o1101]

Originally Posted by '10CamaroDude

That would be the lifter. A collapsed lifter has no hydraulic pressure being built up
inside, so the valve will not open all the way, and it makes noise.

Worn lifters, or excessively low oil pressure, will often produce a clacking or clicking
sound, especially during engine warmup.

The hydraulic lifters are lash adjusters. The valve may still be able to open and
close, albeit not fully, but the clicking or clacking is because the lash is higher.
The noise is the sound of metal hitting metal, because there is more more clearance
between contact points. The lash adjusters keeps everything tighter.

A collapsed valve is totally different. That means a couple of things. The spring is too
weak and it won't close. The valve end popped out of the spring cap, and it can fall
into the cylinder. There will be a definite miss with a collapse valve.

Great info thanks man

[jeklein]

s

Originally Posted by '10CamaroDude

That would be the lifter. A collapsed lifter has no hydraulic pressure being built up
inside, so the valve will not open all the way, and it makes noise.

Worn lifters, or excessively low oil pressure, will often produce a clacking or clicking
sound, especially during engine warmup.

The hydraulic lifters are lash adjusters. The valve may still be able to open and
close, albeit not fully, but the clicking or clacking is because the lash is higher.
The noise is the sound of metal hitting metal, because there is more more clearance
between contact points. The lash adjusters keeps everything tighter.

A collapsed valve is totally different. That means a couple of things walmartone . The spring is too
weak and it won't close. The valve end popped out of the spring cap, and it can fall
into the cylinder. There will be a definite miss with a collapse valve.

This is awesome information. Thank you very much.