I've had them turn loose. I use ARP studs, aircraft nuts, and machined
flat washers, a little bit of red locktite and nothing comes loose
anymore. I also use the rocker stands that support the end of the
rocker shaft.
On May 19, 2008, at 11:57 AM, MadMarx wrote:
> Never heard of this failure on this side of the pond.
> What do you rev, what cam lift you use, what rocker do you use,
> which valve
> spings?
>
> Maybe too much torgue on the bolts, or not enough torgue?
> Stange thing. I use the old stock bolts and had no failure till now
> with a
> mileage of about 2000 mls.
>
> Chris
>
> ----- Original Message -----
> From: "Jack W. Drews" <vinttr4@geneseo.net>
> To: <fot@autox.team.net>
> Sent: Monday, May 19, 2008 3:30 PM
> Subject: [Fot] Rocker stand studs
>
>
>> Again this weekend one of our TR competitors suffered valve train
>> damage because the rear rocker stand stud backed all the way out, the
>> shaft broke, and rockers were damaged. The studs appeared to be grade
>> 8 studs, the one that backed out was not damaged, and the threads in
>> the head were not damaged. On this particular engine, the rocker
>> shaft stands were steel and were in as-new condition.
>>
>> I've seen multiple occurrences of two failure modes -- one is
>> breaking the end studs, the other is studs backing out. Both
>> resulting in collateral damage.
>>
>> What is the collective wisdom of the list regarding
>>
>> ---prevention of breaking?
>>
>> ---prevention of backing out?
>>
>>
>>
>> uncle jack
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Bill Babcock
Babcock & Jenkins
Billb@bnj.com
503.936.7660
www.bnj.com
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