[DeTomaso] Fw: Cleveland engine question

[Thomas Tornblom]

I read about the index pin shearing, causing engine damage, while I was 
assembling my latest build (2005). It appeared to only affect roller 
cams, and some suggested one should use two pins.

The pin is really only for indexing, it should not carry the load. The 
gear should be clamped hard enough to the cam through the bolt to carry 
the load.

When I assembled the engine, with a Crane hydraulic roller cam, 
Rollmaster cam chain/gear and a new ARP cam gear bolt, but without the 
fuel pump excenter, I noticed that the cam was not drilled out deep 
enough for the shank of the bolt, so when I tightened the bolt with my 
fingers the gear would wiggle, completely loose! When I removed the bolt 
and mounted the fuel pump excenter, the gear would just be tight enough 
to not be noticeable loose.

My theory is that people that use roller cams, ARP bolt kits, and the 
fuel pump excenter may not notice that the bolt shank stops the gear 
from being attached tight enough, despite torquing the bolt properly.

The washer that is included in the ARP kit is only half as thick as the 
stock Ford washer, and the unthreaded shank is longer. The cast iron 
Crane (and Ford) cams are also drilled out deeper for the shank, so it 
is not a problem there either.

I confronted Crane with my findings, but the response was that they had 
made these cams for 50 years (yeah, right) without issues.

I solved the problem by getting another bolt, with a shorter unthreaded 
shank.

Thomas


2014-05-08 05:30, mark skwarek skrev:
>     For me I have a gear driven cam and the pin that drives the cam sheared
>     resulting the two broken  valves.   Hopefully my pics will come
>     through.
>     Mark
>     On Wednesday, May 7, 2014 11:24 PM, Will Kooiman
>     <will.kooiman at gmail.com> wrote:
>     I would be very surprised if there isn't interference.
>     But the timing chain rarely breaks.  If it jumps a tooth, you are
>     probably
>     still safe, even with a mild performance cam.
>     On 5/7/14 10:57 PM, "Boyd Casey" <[1]boyd411 at gmail.com> wrote:
>     >  Do Cleveland engines (generally) have valves that will hit the
>     pistons
>     >  if the timing chain breaks? I assume if you have a high lift cam and
>     or
>     >  high top pistons you could have interference but what about a stock
>     >  engine?A
>     >  Boyd
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Real life:   Thomas Törnblom             Email:	   thomas at hax.se
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