Broken rocker stud
#1
Broken rocker stud
Broke a rocker stud
7/16" one with crower rockers and girdle. I have 260# on the seat.....
It popped it right of above the rocker at the bottom of the nut. Any ideas? why it would break..... I t was idleing while I was filling trans fluid and just started missing......
7/16" one with crower rockers and girdle. I have 260# on the seat.....
It popped it right of above the rocker at the bottom of the nut. Any ideas? why it would break..... I t was idleing while I was filling trans fluid and just started missing......
#2
How many hours on the stud and rockers? How high do you turn the engine? What is the open spring load?
Joe Urban
#3
ARP stud.
640 open ( if I remember correctly)
The fracture looks like it has lines across it side to side in a half moon shape, and it was a flat staright across where it broke.
4 passes, everything is brand new. Highest it has been is 7400
Can't get a pic right now.
640 open ( if I remember correctly)
The fracture looks like it has lines across it side to side in a half moon shape, and it was a flat staright across where it broke.
4 passes, everything is brand new. Highest it has been is 7400
Can't get a pic right now.
#4
Try these numbers. 800.826.3045 or 805.339.2200 Ask for tech support.
From what you said above, there could be improper heat treatment or perhaps a material defect. There is also a possibility that something is binding in the valvetrain.
Joe Urban
#6
Most common problems as mentioned above are from the girdle loading the studs. A lot of head manufacturers move their studs around. On any engine with spring pressure like what you have above, I would only use shaft rockers. In the end something like a Jesel Sportsman isn't much more $$ and the reliability is 100% better.
#7
I would advise against the Jesel Sportsman series for ANY application, the are cheaply machined and they have cheap parts in them compared to JESEL's premium lines. If I knew how to get pictures off my camera (other than taking them to Wally World) I would show you several examples of broken Jesel sportsman rockers.
Send the stud back to ARP, sounds like a bad batch of heat treat.
You can't catch a break, I think YOU could break a cannon ball in a sandbox!
Send the stud back to ARP, sounds like a bad batch of heat treat.
You can't catch a break, I think YOU could break a cannon ball in a sandbox!
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