Yella Terra Rocker to Retainer Clearance
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Joined: Jul 2004
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From: Florida
Yella Terra Rocker to Retainer Clearance Hey all. I am installing some 1.7 non adjustable Yella Terra rockers. I have AFR 59cc heads with 7.40 push rods and 921 comp springs. The direction that came with the rocker said you should have .060 between the rocker and the retainer. I have .030. I E-mailed Yella Terra about this and I haven't recieved a response yet. I called Crane and they said .040 was good and I called AFR. They said they have motors out there running .018 to .020. Is there a true spec on this?
I am just trying to see if there is a true spec on this and if .030 is ok. Or should I use the shims which are .050 and move them up and get longer push rods. By the way the wipe is right in the middle on the valve. Any help out there?
Thanks
I am just trying to see if there is a true spec on this and if .030 is ok. Or should I use the shims which are .050 and move them up and get longer push rods. By the way the wipe is right in the middle on the valve. Any help out there?
Thanks
If you have .030 and the wipe pattern is in the middle, I say go for it. If you move the rocker up with shims, then the wipe pattern won't be right and you'll have problems later down the road.
That's the first question, did you verify the wipe pattern. I have AFR's and they had more clearance but I spent a lot of time getting the wipe pattern correct. In the end, my shim was 0.125" so it increased the clearance you are looking at quite a bit.
The YT instructions are horrible and I'm being kind. Here is a link to how I did mine. Link
Make sure the wipe is good then measure for pushrods and check clearances. Wipe is not set by pushrod length of number of turns on the bolt. The YT instructions include how to install fully adjustable rockers too and the whole thing is confusing.
Make sure the wipe is good then measure for pushrods and check clearances. Wipe is not set by pushrod length of number of turns on the bolt. The YT instructions include how to install fully adjustable rockers too and the whole thing is confusing.
Thread Starter
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From: Florida
That link is great vettenuts. It doesn't answer my question. How much clearance is acceptable between the rocker and the retainer. This is what I need to know. My wipe is perfect. The clearance between the rocker and the retainer at 0.030 is my concern.
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The YT instructions are horrible and I'm being kind. Here is a link to how I did mine. Link
Make sure the wipe is good then measure for pushrods and check clearances. Wipe is not set by pushrod length of number of turns on the bolt. The YT instructions include how to install fully adjustable rockers too and the whole thing is confusing.
Make sure the wipe is good then measure for pushrods and check clearances. Wipe is not set by pushrod length of number of turns on the bolt. The YT instructions include how to install fully adjustable rockers too and the whole thing is confusing.
I'll measure the retainer to spring clearance when I get back to the shop on Monday, but it looked ok with the 1.300 od springs.
Russ Kemp
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On The Tree
Joined: Jul 2004
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From: Florida
It is a good thing to know. You don't want the rocker hitting the retainer. I have heard 0.012 to 0.040 is ok from different threads I have read. I am at 0.030. By that I should be ok. I just want to know the spec on this. If I am to close I can install the shims and get longer push rods. I would think there is a spec out there some where.
Just checked the clearance between the retainer & rocker arm. I have over .060 with the valves closed, but my valve angle is 13.5* vs 15* on the AFR heads.
If your at .030, and your valve tip wipe is correct, then your OK. Did you check the valve wipe with the valve springs, or the checking springs?
Russ Kemp
If your at .030, and your valve tip wipe is correct, then your OK. Did you check the valve wipe with the valve springs, or the checking springs?
Russ Kemp
Russ,
I wouldn't think the rockers would flex enough to alter the wipe pattern and if they did I would think they would move back towards the intake side. Did you rotate the rockers with your hand when you initially set the wipe? Point of curiosity on my part.
To the OP, I have been running my AFR's with the YT's and a correct wipe pattern without issue.
I wouldn't think the rockers would flex enough to alter the wipe pattern and if they did I would think they would move back towards the intake side. Did you rotate the rockers with your hand when you initially set the wipe? Point of curiosity on my part.
To the OP, I have been running my AFR's with the YT's and a correct wipe pattern without issue.
Did you ever check your wipe pattern with the heads & valve springs on the engine?
Russ Kemp
Thread Starter
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From: Florida
I checked the wipe with with the springs on the car. One thing I don't like either is the rocker moves up and down alot on the bolt. I rechecked my wipe and think I am closer to the intake side and I have a wide wipe. So I tried one shim and the wipe moved down a bit, but still is wide. So I tried two shims and it is in the center and the wipe is much smaller. Thanks to vettenuts for his thread on this. It helped alot.
I did notice it does very a little if you push the rocker up or down and tighten it down. It doesn't seem you can get them the same on each hole.I don't like that at all. With two shims I have over 0.060. That issue is resolved.
Now I hope I don't have valve cover issues. I ordered a Comp push rod length checker. I am a little bummed I have to by longer push rods.
I did notice it does very a little if you push the rocker up or down and tighten it down. It doesn't seem you can get them the same on each hole.I don't like that at all. With two shims I have over 0.060. That issue is resolved.
Now I hope I don't have valve cover issues. I ordered a Comp push rod length checker. I am a little bummed I have to by longer push rods.
