[DMCForum] Input shaft Couplers (apologies to Bill)

[tmpintnl@xxxxxxxxx]

Bill - I am so sorry about sounding "sharp".  Actually, I was in a 
rather "tongue-in-cheek" mood today when I posted that.  My sincere  
apologies for sounding like I was poking you.  I know that it can be 
a bit tricky to install the roll pin with only the end of the main 
shaft sticking out of the seal.  Can you remember how you did it?  
The reason I changed the roll pin to a stronger version is because 
the local owner that started me down this track experienced a roll 
pin failure to go along with the failure of the splines in the 
coupler.  The fragments of the roll pin actually ruined the main 
shaft because it gouged the splines on it very badly.  In looking at 
the failed pin (without the benefit of a scanning electron 
microscope this time) it looked like the pin had already cracked 
before it gave up altogether.  Typical roll pins get pinched 
together upon installation, and they can yield along the "fold line" 
just opposite the seam, which can start the cracking process.  The 
spiral roll pin doesn't have a fold ... the whole thing kind of 
winds up into itself (if that makes any sense).  Better retention 
too.  Strong enough to stand up to Blue Oval power?  Hmmmm.  I can 
see that I'll have to figure out the stresses and such on the 
splines in the coupler, so that I can make an educated guess on what 
it would ultimately take in terms of torque.  I'll keep you posted.

PS - I wasn't kidding about the stronger input shaft ... if there 
was enough demand for a dozen or so pieces, it would make sense.  
The main shaft would be a bit more $$$ due to the intricate 
machining of all of the gears and whatnot, but that is also within 
his capabilities.  I asked many high-quality machinists around the 
Seattle area, and they all pointed to this guy and said "He's your 
man".

Toby Peterson
www.delorean-parts.com


--- In DMCForum@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> 
wrote:
> 
> Ouch -- those quotation marks are sharp...
> 
> I meant no disrespect. I simply did not know what to call your 
coupler (actually I had forgotten it was just the coupler. For some 
reason I was envisioning the whole clutch interface, but now I 
remember). "Improved" or "strengthened" would have been better 
choices of words.  I had no idea you redid the roll pin too. Is it 
installable with the primary shaft in place? I had a terrible time 
replacing mine when the remainder of the transmission was already 
assembled. Was almost reduced to drilling an access hole & plug in 
the side.
> 
> Your IMPROVED coupler has demonstrated the ability to withstand a
> General Motors block, but is it strong enough to survive a Ford 
engine?
> 
> Bill Robertson
> #5939

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