Installed YTS today and followed JMXS instructions and i had about 3/4 to one full turn of wrench on preload part. So i torqued em dowm to 22#s. I did notice on the TDC cylinder the rocker if i pushed down on the top of the rocker where the push rod touches there would be a good gap between the roller the and valve stem.Started it up and it was loud as hell. Question is, if i had not enough preload and used the shims wouldnt that put me farther away? Some one help me out . Thanks. Jason

 

when you put in 3/4 of a turn of preload, that 3/4 of a turn after the roller touches the valve top (no slack). So I can't understand where this slop is coming from Are all of them like that or just one? if its just one or two, sounds like a bent valve (valve not coming all the way up).

 

...you turned the motor over a few times to cycle the rockers before checked the final torque, right?

 

Yes i did roll it over before 1 torqed them. However i had put on one valve cover before i realized i hadnt oiled them so i put the other one on and went with it. i only ran it for seconds before i shut it off. yall think this may be the problem. I plan on pulling off the covers today and oiling the arms. Ipray this is it, everything went to well for me to think a valve is bent. Still looking for answers. Jason

 

It sounds like you followed jmx's instructions, measured preload on one cylinder, then torqued the remaining seven cylinders without measuring them. I'd go back and re-measure / re-install each cylinder while it is at TDC. That should help pin point what's going on. You might have a problem (like fireball said), or maybe a set didn't torque down properly (like robert said). Since they are mounted in pairs, you get a better feel for the install if you put each cyl to TDC. That way both valves are closed and relaxed, instead of one valve open and one valve closed.

Just my 2 cents.

 

I just saw your response. If you have the covers off today, might as well pull the plugs, rotate the engine, and check the install. You could check the pushrods too. That's easy while you're in there.

 

When we installed mine; they definately did not seat properly against the head the first time. I think this has to do with the fact that they are connected two-by-two. Any way, when we did mine, we cycled the motor several times by hand to make sure the valves rotated and the rockers were fully seated against the head.

...go back and check each one carefully ..hope you did not bend any pushrods, valves, or other expensive stuff...

 

Murdock, unless something is screwed up with his heads it is absolutly unnecessary to check each cylinder. They will all be the exact same, so I 100% disagree.

As for running the engine for only a few seconds, the engine will be REALLY NOISY for the first few seconds of starting up the car after you fire it up. The lifters have to re-pump up. This is very common after releiving the preload on the lifters (ie, removing the rockers) and rebolting them on.

If you start it and it stays noisy after 5-10 seconds, then there is an issue. You should not be having slack in the valvetrain once the lifters get filled with oil, and 0 lash should be pretty easy to spot so I'm not sure what exactly the issue is with your car.

Run it for more than a few seconds and make sure you have oil pressure.

 

Hey JMX it was the oil. I pulled a cover and noticed the rockers looked real dry. Idouched em down with some Mobil 1 and everything sounds fine. Even A-tapped it and no knock and 28 degrees timing. BTW nice write up on the Yella Terras. Jason

 

J2KSS: Glad your up and running!

Jmx: I agree. Unnecessary to check unless something is screwed up. Good job on the writeup, I had a copy handy when I did my install.

 

I guess I had a different experience.

When we did it some of the rocker pairs bound up and the two rocker bolts did not go down all the way. This was caused by the set getting slightly cocked to one side.

After we cycled the engine by hand a few times the sets semed to straighten out and seat better against the head. We then re-tightened them and some were VERY loose, others were seated correctly before the cycle.

Did anyone else have a similar experience?

 

Wow, thats interesting. I definitly didnt have any experiences like that, but I turned each bolt once or twice and then alternated to the next bolt....did that all the way till they were down on the pedestal.

 

I had a similiar problem during install. Thats why I put each cylinder at TDC, THEN installed the rockers on that cylinder.

As far as the noise - mine were ticking like a bitch and I was freaking out - I called Mark @ Raging MS and he said it was common until the lifters "pumped" up again. We verified no rubs then held the revs to about 2K for 30 seconds. Not a peep after that.

 

I installed "R" rockers and new pushrods soaking them both in ATF for 20 minutes...

I also sprayed a 1/2 bottle of silicone on the valve stems, rockers, valve seals, etc. (I copied John Force on that one)

My start-up was NOT noticably different from every other time I started the motor!