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Author Topic:   valve help
Dirt Freak

Total posts: 429
posted March 13, 2005 07:09 PM  
ran car first time and it had a small poping noise out the exhaust, I was thinking a trash in carb and maybe it would clear up but It got louder on the track came in a pulled valve cover only to find that one racker arm nut had backed off and the valve was extremlly lose. We adjusted it back and it ran fine then slowly started to pop again, so I guess its backed off again.New screw in studs but old nuts were used, Is poly locks my best bet or just new nuts. Also is there any thing else that would cause this. Such as bad lifter or someting?

Dirt Maniac

Total posts: 132
posted March 13, 2005 07:18 PM  
I would highly reccomend a set of polylocks they wont come loose and dont wreck threads on the rocker studs like the standard lock nuts. more than likly thats all thats wrong unless pushrod is bent and throwing off your adjustment

Dirt Freak

Total posts: 402
posted March 13, 2005 07:57 PM  
Could be a cam lobe going flat. Been there done that.

Dirt Forum Champ
Total posts: 776
posted March 13, 2005 09:21 PM  
If you are very very lucky its the nut backing off. I smoked 4 cams one year and thats pretty much the way it works. Your'e going to want to get polylocks anyways the nuts aren't practical for racing. If your lash gets bigger with polylocks on its time to change cams. You could always pull the intake and take the lifers out and peek at the cam. Good luck

Dirt Freak

Total posts: 429
posted March 14, 2005 06:26 AM  
If it was the cam or lifter, Would that cause the nut to back off? ITs to the point you can visually see the nut has backed off toward top of stud compared to the reat of them.

Dirt Freak

Total posts: 238
posted March 14, 2005 06:33 AM  
If you can't go with a poly-lock setup, get a new nut. They are self locking, and after they have been removed and re-installed a time or twelve, they tend to loosen up and not hold. If you are near Kansas City, you can come by and get a coffee can full of locking nuts that I have replace with polylocks. Dave

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