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Old 08-24-2012, 03:46 PM   #36
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Re: Broken rocker studs

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I forgot it reply the earlier

Imo.. I think your not properly preloading the lifter.
How much preload did you put on the lifter?
Did you tighten them in the proper firing order?
I think the 1/8 turn is what is being used for lifter pre-load.
If I remember correctly 1/8 to 1/4 turn or up to .090" is what is needed?

What I'm wondering is that if the lifters are pumped up enough when she is making the adjustment.
If not then they end up being way to tight, which might explain the broken studs.
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Old 08-24-2012, 04:08 PM   #37
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my rockers require 1/2-3/4 turn to preload the lifter
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Old 08-24-2012, 04:20 PM   #38
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I was told to do 1/8 to 1/2 turn. They are at tdc when I adjust them also
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Old 08-24-2012, 04:32 PM   #39
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ok. you said afr? assuming you have 165s here are the instructions. http://static.summitracing.com/globa...s/afr-1402.pdf

they say 1/4-1/2 turns.

now you say tdc, you mean you went through the firing order stating at 0* tdc and after each cylinder you set you turned the crank exactly a 1/4 turn? sorry if it sounds like i dont thin you did it right. i just want to be sure?

also what motor do you have? because if its a 302 there are different firing orders.
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Old 08-24-2012, 05:03 PM   #40
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Re: Broken rocker studs

Yes, they should be adjusted at TDC of "each" cylinder or on the "base circle" of the cam to ensure both valves are fully closed. Since they are 90° engines, you can also mark off the balancer in 90° increments from TDC and use those marks to adjust the valves, always turning the balancer in the normal direction of engine rotation, never turn backwards during the procedure.

Just bring #1 cylinder up to TDC on the compression stroke, adjust the valves for #1 cylinder, then turn the balancer 90° and go to the next cylinder in the firing order and adjust those valves, so on and so forth.
Old 302 & 289 firing order - 15426378 (This is assuming you used a cam with that firing order?)
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Old 08-27-2012, 09:08 AM   #41
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Re: Broken rocker studs

Are the threads the same pitch/size on the nuts and studs?

If they are not the same but just "close", that could lead to what you're experiencing. I have seen this in the aircraft world several times.
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Old 08-27-2012, 03:41 PM   #42
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No worried bout over explaining and asking sometimes its the **** you don't think of or over think that goes wrong. But yes tdc of each cylinder and all studs are the same. I looked at them Saturday and they are holding up well now I think I just got a bad batch of bolts. Thanks again for all the help guys it's much appreciated especially web your going crazy over the issue. I'll let ya know of anything starts happening again .... Hope not!
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Old 08-27-2012, 05:44 PM   #43
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Very cool of you guys to dig into that. I learned quite a bit from that discussion. I hope it clears up your issue
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Old 08-27-2012, 10:48 PM   #44
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Re: Broken rocker studs

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No worried bout over explaining and asking sometimes its the **** you don't think of or over think that goes wrong. But yes tdc of each cylinder and all studs are the same. I looked at them Saturday and they are holding up well now I think I just got a bad batch of bolts. Thanks again for all the help guys it's much appreciated especially web your going crazy over the issue. I'll let ya know of anything starts happening again .... Hope not!
Ok we'll stop now.
Best of luck to you.
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Old 08-27-2012, 10:51 PM   #45
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Re: Broken rocker studs

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Very cool of you guys to dig into that. I learned quite a bit from that discussion. I hope it clears up your issue
Thanks, sometimes we get a bit carried away, but we can usually help solve most problems.
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Old 08-28-2012, 12:59 AM   #46
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You Guys are the best thanks for all the support and help
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Old 08-28-2012, 02:13 AM   #47
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Re: Broken rocker studs

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You Guys are the best thanks for all the support and help
You are welcome and I must tell you I am impressed by your knowledge and engine building talents. Good job.
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Old 08-28-2012, 04:43 AM   #48
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You Guys are the best thanks for all the support and help
Welcome! :
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Old 08-28-2012, 01:23 PM   #49
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Quote:
Originally Posted by Trojan Horse

You are welcome and I must tell you I am impressed by your knowledge and engine building talents. Good job.
Thank you I'm going to school for auto and actually built my engine myself in class so hope I know a little or I should drop out haha
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