97formula17

Ok I finally have my heads back from getting ported and what nots. I went with le2's so I could get the stainless valves. Now im trying to set my lifters set. Ive googled this subject and it seems all the threads are old and filled different answers. I set mine at a 1/2 turn. The haynes manual says the lifter plunger should be sitting halfway down in the hole. My lifters doesnt look like theyre sitting more then a 1/4 in the hole. When I set the polylocks the lifter plunger looked like it barely moved down. But my biggest concern is that the pushrod pops out of the the lifter cup. Doesnt that mean I dont have enough preload or is it because the lifters aren't primed?

bowtienut

iTrader: (1)

If you've accurately set preload to 1/2 turn after ZERO lash, then you're good. LS7 lifters are no different in that respect than any production SBC roller lifter.
Finding zero lash is where people have issues, and if anything, they get them too tight, not too loose. Just where you can't move the pushrod up and down, and the rocker doesn't pivot freely or rock side-to-side freely, is zero lash.
With any preload at all, the pushrod won't pop out of the cup.
I run mine at just 1/8 turn past zero, as insurance against pump up due to any possible valvetrain float at 7100 rpm.

wrd1972

iTrader: (12)

97formula17

When I set it at zero my pushrod had no up/down movement and I could feel the drag. Then I went 1/2 of a turn. Then I rotated the motor 360° and did the other valves. After I set the next group of valves, I rotated to see if there were any problems. Thats when I saw the pushrods popping out the lifter cup. So I put it back on tdc to recheck everything and noticed my rr's felt a little loose and are able to rock from side to side. Am I not setting them deep enough? Idk why but these damn valves are kicking my a**.

guppymech

iTrader: (7)

How are you determining TDC? The balancers on these engines are not keyed to the crank and can be installed anywhere. Pull the #1 cyl spark plug and rotate the engine over while watching #1 cylinders rocker arms, after the intake vlv closes #1 will be coming up on compression. Look in the plug hole for the piston, when it reaches TDC mark your balancer to some point of reference on the engine. Start adjusting your vlvs from this position. Note: #6 piston will be at TDC also but it will be on the exhaust stroke. If the lifters for the valves you're adjusting are not on the base circle of the cam you'll never get them adjusted correctly.

97formula17

Thats how I have always found tdc. I looked in my haynes manual and it says what other valves can be set with no.1. It then says to turn the crank 360° and set the other valves.

Shownomercy

iTrader: (1)

Do it one cylinder at a time. Watch the intake valve open, close and then set it, then do the exhaust valve, same premise.

Slow, but it works.

SS RRR

iTrader: (2)

When intake starts to close, adjust exhaust.
When exhaust starts to open, adjust intake.

97formula17

So should the rocker not be able to rock back and forth while both valves are closed?

SS RRR

iTrader: (2)

The lifters will bleed down some when the engine is off which will cause some slack in the valvetrain. Being able to wiggle rockers back and forth is normal when the valve is closed.
As already stated, when adjusting valves your best bet is to wiggle the pushrod up/down to find zero lash. Because you are adjusting the pushrod up against the plunger spring in the lifter there will be very little resistance. It is perfectly normal for the adjusting nut to be very easy to turn. Just keep your adjustment past lash consistent with the other valves.

camar0corey

iTrader: (22)

No, do them only once.
True story, if you have never talked to anyone in person who knows what they are doing and then follow the directions from the manufacture, you would think they would tell you this. They do not.

So go back to 2005, I am doing rockers for the first time in my life. I did the half and half method, noticed the first set of 8 I had done were loose again. So I tightened them again. I did this over and over and over until I couldn't move the pushrod. OOPPSSSSSS!!! Wayyyyy too tight! So obviously the car wouldn't start and I had no idea why, I figured I had done them right. Lesson learned. ROCKERS SHOULD SHIP WITH DIRECTIONS THAT STATE ADJUST ONCE! Why? Because obviously if a person has never done them before and logically thinks, hey let me check those I had adjusted already, well it does create an issue.

Do them only one time, yes when you bring it back around it will seem like they are loose, but they are not.

F0x Slaughter

I tried the engine off and I couldn't get them right.
So I do engine running.
Tighten them all, start the car and let it idle.
Loosen one rocker at a time until it clicks, then tighten till it stops then 1/4 turn past that.
Repeat.

cardo0

A lifter bleeds down in milliseconds and does it through the tiny clearance between the internal piston and inner wall of lifter body. The lifter only bleeds down to the level of the fill hole that fills from the oil galley. Anyone that tells u it takes time to bleed down is clueless about hyd lifters and too F'n lazy to google a hyd lifter and figure that out. A hyd lifter is bleed down by the time the lifter comes off the lobe and hits the base circle.

Next a lifter pumps up using the remaining space between the cup/piston assemblies and a step inside the lifter inner body - forced open by a spring. This is what is used up when setting pre-load. So the less preload the more it allows the lifter to pump up once the lifter reaches the top of the cam lobe. Yes the less pre-load adj the more it allows the lifter to pump up - not the other way around. If u want to reduce pump-up then increase the pre load and the shop manuals will tell u to adjust up to 1 full turn - good idea. Thats another concept someone would have to be able to read to comprehend. Anyone can google this but it may take a few re-reads and hours to sort it out.

97 if u do some searching u will find a lot of others having problems with the poly-locks loosening up. The trick is to once u have the preload set is to bump the nut in the tight direction to help lock it down. If your loosing your preload setting then its the polylocks slipping not the lifter.
Also if u still have an old lifter then u should try and depress that cup yourself and u will realize u wont be able to force that cup down yourself. Priming has nothing to do with it. Its the spring inside that lifter that resists the cup and its strong as hell. The preload is determined by the space between the piston and a step inside the lifter body that stops it form moving downward further.

As for getting on the cam base circle i like to use the firing order 1-8-4-3-6-5-7-2 as there are always 2 pistons at TDC at the same time but one is on the compression stroke - with vlvs shut - and the other is in overlap - with both vlvs open. U can see this as u rotate the engine. The pistons go to TDC is pairs: 1&6, 8&5, 4&7, 3&2. Just look for one cyl vlvs to open and the other cyl will have both cam lobes on the base circle ready to adj.

Adj hyd lifters is critical to engine life and this forum is full of bad mouthing clowns to lazy to even look it up let alone explain it correctly.

Hope this helps more than it hurts,
cardo

bowtienut

iTrader: (1)

No, you moron. Once again, you don't even have enough basic comprenhension to properly regurgitate all the stuff you read. *** backwards. If you actually had experience with this stuff instead of spending all your time internet surfing, you'd realize how ridiculous your above statements are. People like you is why we see less and less intelligent and helpful people even bothering trying to help on this forum anymore.
GTFOH!


Hope all you want. Once again, it didn't happen

F0x Slaughter

SS RRR

iTrader: (2)

^^^ Good demonstration for those who still think the retainer clip to hold the plunger in place still has anything to do with the action of the lifter...

cardo0

Now its right in front of your face. That video shows the piston held up from the step in the lifter body by the spring. That is the distance of the preload. U turn the adj nut too much and add too much preload and u now have a solid lifter - more than that u start to open the vlv or even bend vlv train items.

That preload distance is what can hold the vlv open at high rpm - called "pumped up". The village idiot calling others morons cant see that and thats his problem. But the less preload on the lifter the more distance is available under the piston and the more lifter can "pump up" at high rpm. And thats the fact! Right in front of your eyes now. The more preload u add the less the lifter can pump up - thats the fact!
I dont know why that village idiot continues to post his azzbackwards description. Mentally incompetent.

And the other village idiot cant see how the spring is holding the piston up when adjusting the preload but instead babbles on about the retainer clip. Because he cant figure out how it works either though its right in front of him. I guess hes still waiting for the lifter to bleed down - ho, ho, ho. Still waiting for him to explain how the lifter bleeds down. And how long it takes too - ho, ho, ho.

97formula17

I the rocker moving side to side with the valve closed was normal but I wasnt 100% sure. The thing that has me worried is pushrod coming out of the cup. Last time I set them at 1/4 of a turn and I bent all my exhast valves and broke/bent my pushrods. So I want it to be as close to perfect as I can get Before I touch the starter.

bowtienut

iTrader: (1)

Hey dum dum.....er cardOlt, It's clear you don't even know what "pump-up" means. Hint: it's not the same as "collapse"
You're a kindergarten math student trying to do Algebra.
Back to yer books.

97, You were WAY beyond zero lash before you put that 1/4 turn on them, if it resulted in all that carnage.
Stop worrying about the pushrod coming out of the cup. I think you should find somebody local to show you how to do this just this one time; it will make sense after that. very easy to show someone; harder to explain.

SS RRR

iTrader: (2)

I don't know what to say. Even with bled down lifters I've never witnessed a PR walk from the plunger when adjusting valves.