I've been chasing a fix for the 2500-2800 RPM valve noise in my '15 Limited since I bought it and finally stumbled onto a fix that essentially silenced it.

I put a set of Rockout shims in the carriers and that stopped the loud clattering that had developed but not the loud-ish valve train ticking and clicking at the above RPMS. I expected this result, since they are two distinct and identifiable noises.

When I put in the shims, I also installed a set of Wood Performance Directional Lifters, but one of them took a LONG time to pump up initially and I suspect that it's the one that started acting up shortly after the first 20-or-so mile test ride.

After about 100 miles of listening to it clicking away, I installed a set of SE adjustable push rods, as advised by Mr. Wood, which had no effect at all over the noise for the next hundred miles of riding.

I finally decided that at least one of them was defective and removed the lifters and sent them back to Wood's for testing and put the OEM lifters back in, only this time I aligned the oil-holes with the feed holes in the crank case (why they can be installed in the opposite orientation, I'll never know) and also ran the adjustable rods down 3 full turns instead of the recommended 2 1/2 - which I had seen mentioned as OK to do on the forum a while back.

My valve train has been essentially silent ever since. No cold-startup clatter any more either - so far, anyway. Don't know if I'll be putting the Wood's back in or not, at this point. I might just write the whole experience off as a $280 lesson learned, since I found out about aligning the oil-holes from buying the Wood's units that are designed to be installed that way exclusively, and I probably wouldn't have tried the adjustable push rods, either.

I don't know if this will work in EVERY case, but it certainly worked perfectly for me.

 

Are you saying they was put in wrong way from the factory?? If so this is quite worrying!! I am just waiting for some Rockout shims to be delivered then, when fitted It should stop the clattering in the top end!!

Ady

 

No, I'm not saying that they were put in "wrong" at the factory. They can be installed either way according to the Service Manual, but they seem to work better and be more quiet when installed the way I did it.

It's a very simple thing to check and re-orient them while you're installing the shims. with only the additional cost of a couple of new gaskets.

Best wishes,

JP

 

Glad to hear you got your problem solved!

Wonder if maybe it was the pushrod adjustment that did it?

As for lifter orientation, my '15 service manual says...

"Install lifters in the crankcase bores with the oil hole on the inboard side and the flats on the lifters facing forward and rearward."

But, as you said.... everyone says it doesn't matter.

Maybe it does.

 

I'm not sure about how the pushrods can be aligned, other than with a set of rocker shaft shims to center the carrier, which were installed back when I installed the Wood's lifters.

Anyway, I'm damn happy with the results and the fact that I'm done having to screw with it (for now )!