[DeTomaso] Distrubutor Gear Chewed Up

[Thomas Tornblom]

Daniel C Jones wrote:
> Thomas,
> 
> I've not seen that problem but I've not seen my cam, either.  I had it
> directly sent to Dave Williams.  Dave, let us know what you find when
> you assemble the engine.

Crane is investigating the problem, including chasing up the blue prints.

They said they see three potential causes:

1) The blueprints for the core are wrong
2) The vendor making the cores did a mistake
3) The guy at crane finishing my cam did a mistake

The tech guy at Crane checked around the tech department, and they had 
had no such problems from other customers, or so they say.

My problem may be aggravated by the fact that I'm not installing the 
fuel pump eccentric. Using the stock Ford bolt and washer, plus the 
eccentric would potentially avoid the problem, or at least hide it.

I can imagine it will be a hit or miss with the combination of bolt and 
washer, timing gear brand, using the fuel pump eccentric or not.

I am contemplating drilling the threads about 1/2" deeper into the core, 
with the cam still in the block. I would prefer not having to remove the 
timing gear again as it is new and is really tight.

Anyone know how hard these cores are? Would a plain drill bit in a power 
drill work?

Anyway, Crane said they would get back to me today.

> 
> Dan Jones
> 

Cheers,
Thomas

> 
> On 6/1/06, Thomas Tornblom <Thomas.Tornblom at hax.se> wrote:
>> Speaking of steel roller cams, I just ran into an unforeseen problem
>> today with my new Crane hydraulic roller cam. The threads for the cam
>> gear bolt starts way too early, which makes the unthreaded part of the
>> bolt shank bottom out before clamping the gear properly.
>>
>> It was just by sheer luck that I noticed. I got a box with random arp
>> bolts from Summit today, and one of them was a new cam bolt. The
>> supplied washer is slightly thinner than the stock washer, and when I
>> tried to bolt down the gear, the bolt wasn't even close to reach the
>> washer before it couldn't be threaded anymore.
>>
>> I compared it to the old cast iron flat tappet Crane cam, and the
>> threads starts about 0.78" down the hole, and the bolt can be threaded
>> almost to when the bolt head reaches the cam, if no gear is in place. On
>> the new cam the threads starts 0.31" down the hole.
>>
>> Using the old bolt I get about 1/4 turn after the bolt touches the
>> washer before the bolt bottoms out in the cam core.
>>
>> Is this a common problem, and are there any special short bolts for this?
>>
>> Thomas
>>
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-- 
Real life:      Thomas Törnblom             Email:  Thomas.Tornblom at Hax.SE
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