Lifter /Rocker arm install question
Lifter /Rocker arm install question I installed my rocker arms today but something didn't seem right with 2. As I was hand tightening the poly lock, it came to a hard stop. I pulled it and the lifter and put the lifter back in and wiggled it to make sure it seated. Same thing. The others I could hand tighten to 0 lash then 2 full turns for preload and could feel the lifter compressing. This one not so much.
Brand new ls7 lifters and I soaked then prior to install.
What's going on here? Is it possible it is filled with oil just from soaking?
Brand new ls7 lifters and I soaked then prior to install.
What's going on here? Is it possible it is filled with oil just from soaking?
Last edited by SmokeyCheese1; Mar 18, 2018 at 05:38 PM.
Make sure you loosely thread in the rocker arms at the same time. If you install them one at a time it will cause the rocker tray to bind up against the rocker bolts from misalignment. Initially I did mine back to front and the front rocker bolts didn't want to thread in all the way because they were hitting the tray
Sorry, more information I forgot. Using Stud Mount rockers and poly locks. No rocker tray here.
It just felt like the push rod bottomed out on something hard and didnt seat into the lifter at all. Im entertaining the possibility that the lifter is indeed filled with oil and will bleed out. Im going to check it again tonight to see if it bled out. Otherwise, Im pulling the head........again........and checking that lifter.
It just felt like the push rod bottomed out on something hard and didnt seat into the lifter at all. Im entertaining the possibility that the lifter is indeed filled with oil and will bleed out. Im going to check it again tonight to see if it bled out. Otherwise, Im pulling the head........again........and checking that lifter.
Yeah I know all that. First brand new lifter install for me though so I thought I would see if anyone else had run across this before.
Does the valve open while you are adjusting? I would adjust that cylinder and let it set for a while. They will bleed down if that is the issue.
Also, are you adjusting on the base circle for each rocker? If not, that might result in what you are seeing.
Also, are you adjusting on the base circle for each rocker? If not, that might result in what you are seeing.
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From: Virginia
You can go down a 1/4 turn at a time and then rotate the engine around to help it bleed down. I had one do that to me too. I'm using Jesel shaft mounts though, and comp cams short travel racing lifters. They're total travel is your preload. Kind of wishing I went with standard travel ones because they get loud when the engine heats up. I think it's due to head expansion. I'm going to set them another 1/8 turn to see how that works. Comp agreed with that, so we'll see I guess.
The cam rotation should force it to bleed down though. I am assuming you cleaned them prior to installing. The hole isn't very big, just a little gunk in there and they won't bleed properly.
Preload seems fine to me at 2 turns. I want to say even .100 is okay for those lifters. It's been a minute since I looked up the specs though.
The cam rotation should force it to bleed down though. I am assuming you cleaned them prior to installing. The hole isn't very big, just a little gunk in there and they won't bleed properly.
Preload seems fine to me at 2 turns. I want to say even .100 is okay for those lifters. It's been a minute since I looked up the specs though.
Crane followed a similar procedure. I think it was 1/2 turn of the adjuster, rotate motor, next 1/2 turn, rotate motor, etc. with a 5 minute wait between 1/2 turns. At least that is what I recall. This allowed bleed down time.
You can go down a 1/4 turn at a time and then rotate the engine around to help it bleed down. I had one do that to me too. I'm using Jesel shaft mounts though, and comp cams short travel racing lifters. They're total travel is your preload. Kind of wishing I went with standard travel ones because they get loud when the engine heats up. I think it's due to head expansion. I'm going to set them another 1/8 turn to see how that works. Comp agreed with that, so we'll see I guess.
The cam rotation should force it to bleed down though. I am assuming you cleaned them prior to installing. The hole isn't very big, just a little gunk in there and they won't bleed properly.
Preload seems fine to me at 2 turns. I want to say even .100 is okay for those lifters. It's been a minute since I looked up the specs though.
The cam rotation should force it to bleed down though. I am assuming you cleaned them prior to installing. The hole isn't very big, just a little gunk in there and they won't bleed properly.
Preload seems fine to me at 2 turns. I want to say even .100 is okay for those lifters. It's been a minute since I looked up the specs though.
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Joined: Oct 2014
Posts: 1,220
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From: Virginia
They were brand new. I didnt think I had to clean them? The crane instructions indicate that no bleed down is necessary on new lifters as they shouldnt be pumped up but I didnt soak them.........much much longer than one day. I guess it possible it filled up but idk. I'll know more later.