https://drive.google.com/file/d/1Zx_...ew?usp=sharingPutting an engine together for a friend. Installed rockers/pushrods etc. I go to set the lash and one lifter is collapsed. So I prime it and set the rest, priming every 1/4 turn of the crank. Still stuck down and flooding out the oil. Here's a vid if I can attach..
These are brand new and not cheap. They are 857-16 comps which I know is not ideal with some experiences, but I though that was related to high spring pressures. These are not crazy springs and it hasn't even been running yet. Is it common for these to not even hold a preload for goodness sakes!!
I don't feel good about the rest either, setting 1/2 turn, some are really weak and some stiff (on that 1/2 turn).

https://drive.google.com/file/d/1Zx_...ew?usp=sharing

 

did you soak them in solvent first? I pull every one apart and clean them first, even if the plunger moves freely
cant see the video either

 

See the vid now. I don’t know what they put on them to prevent rust during packaging and shipping but it’s really sticky. I don’t like it so every one of them gets disassembled and washed… without mixing up the internals and bodies

I would take that one out and wash the internals for sure.

 

I didn’t think these internals would clear the tie bar. I may be thinking of some motels I tried to clean.
I will try, thanks Dale

morels!

 

Take it out and turn it upside down and smack it hard against the work bench. That usually breaks them free. Then see if you can work it a few times in some oil and make sure it doesn't stick again.

 

I would do them all.

 

Most hydraulic rollers wont but I have never tried a Comp Olds one.

 

By the way, I have had it happen a few times ovr the years. Last time was a set of the very expensive Morels so its not terribly unusual.

 

I see what you guys mean- sticky anti corrosion- total BS. Maybe that's why they're discontinued now? The one lifter I could not work free until I used a heat gun-hot! Then upside down bangs on the bench. Cleaned out the rest with hot diesel fuel and then brake clean. They all feel normal during lash set. Thanks guys, this is pure stupid btw. Comp must have had a lot of these returned when they didn't really need to be

 

That part number has been discontinued because the new Evo ones are 85701-16 I believe. (Easy way to tell is the new ones will have 2 snap rings in them). You most likely have the old ones, which have probably been sitting on a shelf for a while. And depending on where and how long they’ve been sitting, that might explain why they’re sticking.

 

Date on the box is 11/2020. These particular comps have spiral locks, my morels had a single snap ring (just sharing).
I could not free these up without some help from the heat gun. I tried banging them upside down without heat to the point where any harder and it would make more sense to smash this poorbastard’s credit card instead.
Plungers would not clear the tie bar, so I took apart what would come apart and put them in my ultrasonic cleaner full of diesel set to 130f. I worked them after that and they all feel good.
Blows one’s mind as this has probably caused some people chaos, I wonder where these are actually made. Working at gm dealers, this reminds me of many senseless and expensive recalls. Global manufacturing really creates a lot of risk (including domestic in order to maintain competitiveness).

 

they were still available as of sept 2024 i know of because I got a set and a single pair. I see them still listed quite a few places. got those through Summit and CNC motorsports

 

Correct, they kept some to replace single sets etc. But most likely you got NOS from Summit and CNC.
I know for a fact if you order a cam and lifters direct from Comp today, you have about a 95% chance of getting the new ones.
And he posted the date on the box, 2020. That makes sense as well.

 

you’re probably right about the rust preventive they put on them causing issues. they do specifically say to soak them in solvent to thoroughly clean it off before installing.

I’ve always pulled them apart to clean and never had any problems, with comps or Howard’s which is Morel. If you don’t want to pull them apart, soak them in solvent for a while , take them out and then depress the plunger a few times, stick it back in the solvent to remove anything that you loosened up

If they all feel the same, compress and release ok, then soak in oil but don’t pump them up.

here’s the vid of Comp talking about soaking in solvent before install.
https://www.chevyhardcore.com/news/v...dos-and-donts/

 

My instructions say
1. "The lifters need to be cleaned with mineral spirits or parts washing solvent first to remove any debris from shipping or handling"
2. "soak comp break in oil".

I interpreted that as
1. "using mineral spirits, wash the shmutz off of the outside of the lifters that the current daycare center introduced into the box"
and
2. "soak comp break in oil"

I didn't interpret that as "get them hot, beat TF out of them on the bench up side down, take them apart and clean TF out of them , Which is what it took.

JK Dale! I get your point, read the instructions.
But if you actually told comp what it USUALLY takes to fix these and it didn't this time, they would void your warranty because you took them apart. (generally that's how it works anyway). It does say in the instructions not to pump them up pumped them up but I did because of that stuck down plunger.
Thanks again for the help, these feel fine now. Free and not pumped up during lash setting.

 

all true. it’s frustrating,, especially the time involved