Rocker Arm Adjuster Setup

[YO7_A66]

I am installing my new push rods and adjusting the lash for the break in on my 340/420.

I always start out marking my adjusters at the 12:00 position with the adjuster fully seated. Then I count the turns on the adjuster while I am adjusting the cold lash, and I write down the adjuster turns for my notes. All my adjusters are now within ¾ of a turn to each other for reference.

In the past, I have had the same adjusters fall within 1-1/4 turn of each other when the lash setup was finished. This time, I wanted to give a little more effort and I ordered different length pushrods to get the adjusters a little closer to each other. At this point, I could even swap out a couple of the pushrods to get the adjusters to fall within ½ of a turn to each other, but I am not sure it's worth the effort at this point since all the valves are now adjusted.

My question is: when your adjusters are all setup, do you worry about how far out each adjuster is TO EACH OTHER when you are done? Do you try and order your pushrods so that all of the adjusters are within ½, ¾, or a full turn to each other, or do you only care that the lash is set, and you have some adjustments in either direction when finished and your adjusters are not turned out too far.


Just curious how far you take the setup, and thanks!

 

[Plymouth 65]

I typically like to have 1-2 threads protruding on the pushrod side of the rocker adjuster once the lash is set. BTW, what rockers are those pictured? 65'

 

[YO7_A66]

I typically like to have 1-2 threads protruding on the pushrod side of the rocker adjuster once the lash is set. BTW, what rockers are those pictured? 65'

These are Yella Terra, and they give their setup spec a little different than other brands. They suggest keeping the adjuster less than 2 turns out. The adjuster cup end diameter is recessed into the rocker body and this diameter is a very tight fit in the body of the rocker. This helps support the adjuster during load. So as long as I dont adjust them too far down (+ 3 turns), they are still supported by the body. I have always aimed for 1/2 turn to 1-1/2 turn out from the bottom in the past.

So, you keep your setup within 1 turn of each other. Thanks!

 

[Kendog 170]

What lifters? Hydraulic 1/2 to 3/4 turn IMO. As said a couple of thread exposed. Too many and they can break.

 

[YO7_A66]

What lifters? Hydraulic 1/2 to 3/4 turn IMO. As said a couple of thread exposed. Too many and they can break.

My question is not about preload or lash, its about the relationship between the adjusters after the preload or lash is set. Do you guys prefer to purchase custom length pushrods to keep this relationship close, or purchase off the shelf lengths as long as they are within a turn or so from each other.

 

[Bewy]

I would venture that the reason for keeping the adjuster cup close to the rocker has nothing to do with strength.......but more to do with rocker ratio. The further out of the body the adjuster is, the more 'ratio' that is lost on the prod side resulting in lost valve lift & duration.

 

[Newbomb Turk]

I would venture that the reason for keeping the adjuster cup close to the rocker has nothing to do with strength.......but more to do with rocker ratio. The further out of the body the adjuster is, the more 'ratio' that is lost on the prod side resulting in lost valve lift & duration.

That and oiling.