[DeTomaso] Roller cam issue, was Distrubutor Gear Chewed Up

[Thomas Tornblom]

Tomas Gunnarsson wrote:
> Thomas,
> 
> Ivestigate this thoroughly! The countersunk threads give the bolt a longer section that stretches when you tighten it, improving how well it stays in place.

Sounds reasonable. It will need all the clamping force it can get. I 
read some horror stories with roller cams where the index pin had broken 
off, sending the cam timing to the moon and basically destroying the top 
end. My machinist said that it really isn't the pin that transfer the 
force, but the clamping force. Perhaps the unlucky ones were using the 
stock Ford bolt and washer with a cam similar to mine, and only getting 
about half a turn of clamping force?

Perhaps I should pull the cam and have about 0.5" of the threads removed...

Crane is investigating the issue.

> 
> Tomas

Cheers,
Thomas

> 
> ----- Original Message ----- 
> From: "Thomas Tornblom" <Thomas.Tornblom at Hax.SE>
> To: <MikeLDrew at aol.com>
> Cc: <Thomas.Tornblom at Hax.SE>; <detomaso at realbig.com>
> Sent: den 1 juni 2006 17:22
> Subject: Re: [DeTomaso] Distrubutor Gear Chewed Up
> 
> 
>> MikeLDrew at aol.com wrote:
>>> In a message dated 6/1/06 5:45:33, Thomas.Tornblom at Hax.SE writes:
>>>
>>> << Is this a common problem, and are there any special short bolts for this? 
>>>
>>>>>> Break out the hacksaw! :<(
>> Rather the drill. The problem is that threads are not counter sunk in 
>> the cam core deep enough. The unthreaded part of the bolt runs into the 
>> threads.
>>
>> I have just gotten a 2" allen bolt, which I believe is 12.9 or so (grade 
>> 8) and it is threaded all the way and it works, I think.
>>
>> I will contact Crane and ask what they recommend and why they have done 
>> the cam like this.
>>
>>> Mike
>>>
>> Cheers,
>> Thomas
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