Jack;
When I first started racing my TR3 I broke 2 studs the same
weekend. Both times it was the front one. I think the first one broke
because the top nut was not tight enough. After that the second one broke
the next day. I found that the bottom of the pedestal had become rounded
from the first break and would rock. I replaced the pedestal and also put in
ARP studs with hardened washers and ARP nuts. Haven't broken one since. May
not have anything to do with yours, but something else to look at.
Dean T.
-----Original Message-----
From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net] On Behalf
Of Jack W. Drews
Sent: Wednesday, August 23, 2006 7:58 AM
To: FOT@autox.team.net
Subject: [FOT] rocker stud breakage
I broke two rocker stand mounting studs, both times the rear one,
this weekend and I haven't been able to find the smoking gun cause.
I'd appreciate any input.
No marks on valves or piston tops
no marks indicating interference with sleeve eyebrows
spring coil clearance - .080 coil gap at cam's full lift
retainer - to - guide clearance .100 at full lift
EGT's at racing speeds 1400, same front and back, but carbon deposits
in #3 and #4 somewhat lighter indicating somewhat leaner conditions -
but not much
grade 8 studs
heavy duty outrigger type aluminum rocker stands
bronze guides, .004 stem clearance
Can you think of anything I'm missing?
uncle jack
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