Mikey97Z

I'm lashing my rockers and I noticed that on a couple of valves the lifter plunger compresses easily. On most of the rockers I set zero lash with my fingers, then need a wrench to get that extra 1/2 turn. But on a couple of them I can do the extra 1/2 turn with my fingers! I never felt it like that before. Does that mean they're collpased? What is "collapsed". What causes that?

These are Crane 10530 lifters, if that maters.

Please let me know because I have the intake off and I could replace them now! Thanks.

ONELOUDKAR

either that or either a bent valve maybe. same thing was happening to my car kinda and ended up having a valve bent and got a valve job done to it. was it making a ticking noise or what?

-Mike

Mikey97Z

Definately NOT a bent valve. This has to do with the lifter plunger.

ONELOUDKAR

not sure then.... when you tighten the spring down, do you have to go a few more turns to get it tight?

Mikey97Z

I really explained it as best I could. A couple of the plungers depress very easily, while most are very strong. Does this mean they're collpased? What would cause them do do that?

ONELOUDKAR

To be honest, I am not sure. In my case, I had collasped and a bent valve. So I am not sure which one would cause that. Sorry that I can't really help you there.

95 Z/28 LT1

Could you tell you had a bent valve without pulling the head it was in?

What was the story behind your problem?

ONELOUDKAR

Yes, the guy could tell once he took the rocker and springs off. Where the rocker hits, it was beat-up around the metal part and
looked like a jagged edge of metal on top of the head. He did not have the heads off either, he called me up at work and told me he wanted me to see what it was!

My problem I was having were... one of my rockers kept coming loose and I had to keep tightening them up. The more I did that, the farther it went down everytime. I would have to turn like 2-3 full turns to even get it tight, as to the others... just a 1/2 turn or so... plus I had the collasped lifters.

Mikey97Z

I see how that could happen. First a lifter "collapses" so it feels really soft. That makes slack so the rocker is loose. So you tighten the nut down till it's snug. Now it's at the bottom of the plunger travel instead of the top. Then you add a half turn to it and BAM that ****'s way too tight. Bent valve.

I just talked to the tech dept at Summit and he says that when the spring under the plunger gets foobar and doesn't pump up and down any more then that's "collapsed". I'm going to order a new set of lifters. Comp Cams recommends

CCA-850-16 Chevrolet: 1987-up 305/350, High Energy, hydraulic roller, lifter set
These High Energy roller lifters are designed for use with the newly designed hydraulic roller cam series from Comp Cams, or as a performance replacement for stock hydraulic roller lifters.

ONELOUDKAR

yea.... thats what i put in mine as well. good choice

Don 97 SS

Those are the ones I just installed when I did another cam. They appear to be well made and look very simialr to the oem ones. Comp recommends that thee lifters be replaced anytime a new flat tappet or roller) cam is installed.

kmook

Better safe than sorry

ONELOUDKAR

I had the whole 9-yds done to my car