[DeTomaso] Cruise control again--you how one project causes something else to break...?

Christopher Kimball chrisvkimball at msn.com
Mon Sep 14 10:25:30 EDT 2009


Let's hope that's all it is.  Thanks,

Chris

> Date: Mon, 14 Sep 2009 09:31:06 +0200
> From: Thomas.Tornblom at hax.se
> To: chrisvkimball at msn.com
> CC: mikeldrew at aol.com; detomaso at realbig.com
> Subject: Re: [DeTomaso] Cruise control again--you how one project causes something else to break...?
> 
> The problem is very likely that the "turnbuckle" part is threaded 
> unevenly to the angle drive and the ZF.
> 
> I had this problem with mine, and the threads bottomed out on the angle 
> drive, while it was loose in the ZF end.
> 
> This problem is easily fixed, just unscrew the angle drive from the ZF 
> using the turnbuckle, then unscrew the turnbuckle one full turn more 
> from the angle drive and reattach it to the ZF. If it is still sloppy in 
> the ZF end, repeat the procedure.
> 
> When the turnbuckle has the proper number of threads on both the ZF and 
> the angle drive, you will be able to attach the angle drive solidly to 
> the ZF in the direction you want, without any slop.
> 
> Good luck,
> Thomas
> 
> Christopher Kimball skrev:
> > Dear Mike,
> > 
> > Thank you for the very detailed and very helpful information.
> > 
> > The first thing I have to do, then, is remove the angled piece.  
> > 
> > At this point, the angle drive is frozen into the threaded pipe.  The angle drive and frozen pipe move as a single unit, swinging around until the square-shaped protrusion hits the ZF case, preventing 360 degree turning.  If I can free the angle drive from the threaded pipe, the unscrewing might move the angle drive far enough away from the ZF case that I would be able to continue the 360 degree turns to extract it completely.
> > 
> > If I can't get the angle drive unstuck from the threaded pipe while the assembly is mounted in the ZF, I might be able to temporarily bend the square protrusion over far enough to make the full revolution, thereby allowing me to continue the 360 degree unscrewing and remove the square drive and the pipe as one unit.  Would doing that cause any problems?  The risk, of course, is that I break the square protrusion off and then have to buy a new angle drive, no matter what.
> > 
> > Thanks,
> > 
> > Chris
> > 
> > 
> > 
> > 
> > 
> > From: MikeLDrew at aol.com
> > Date: Sun, 13 Sep 2009 23:42:35 -0400
> > Subject: Re: [DeTomaso] Cruise control again--you how one project causes something else to break...?
> > To: chrisvkimball at msn.com; detomaso at realbig.com
> > 
> > 
> > 
> > In a message dated 9/13/09 19 55 30, chrisvkimball at msn.com writes:
> > 
> > 
> > 
> > 
> > 
> > Before I start trying to strong arm the turnbuckle nut to move, is there anyone out there who can give me some help and advice on what I'm looking at to get the ZF device to work?  I was also told that if I do the wrong thing, a piece (maybe an inner nut) might fall into the ZF which wouldn't be good.
> > 
> > 
> > 
> > 
> > 
> > I just went through this exercise on Markus Woehler's car a few weeks ago.
> > 
> > 
> > 
> > The ZF angle drive is not supposed to be loose on the gearbox.   There is a threaded pipe that exits the case at a 45-degree angle; the speedometer gear passes through this pipe.   The angle drive is threaded onto the pipe.   The end of the speedo gear is shaped like a flat-blade screwdriver and engages a slot in the angle drive.   Bevel gears rotate the motion 90 degrees, ending in a square-shaped protrusion that the speedometer cable engages.
> > 
> > 
> > 
> > You should not be able to rotate this protrusion by hand, given that it's directly geared to the speedometer gear.   In your case, something is wrong.
> > 
> > 
> > 
> > The good news is it shouldn't cost too much to repair it.   It is probably just a bad angle drive and Dennis Quella (along with some of the other vendors) have good new and used ones available.   Dennis said a new one is $176 and used is $100-120.   
> > 
> > 
> > 
> > The other potential problem is that you could have broken the gear that emerges from the transmission and turns the angle drive.   That would be a bit more challenging.   
> > 
> > 
> > 
> > Here's a photo of the part:
> > 
> > 
> > 
> > http://www.panterapartsusa.com/cgi-bin/detail.cgi?prod_id=07801b
> > 
> > 
> > 
> > The geared end goes into the transmission, the other end has what looks like a flat-blade screwdriver.   That engages the angle drive and turns it.   What could have happened is that the screwdriver blade broke off.   If that's the case, then you have to do some gearbox surgery.
> > 
> > 
> > 
> > Look at this drawing:
> > 
> > 
> > 
> > http://www.panterasbywilkinson.com/webpages/catalog/ill11a.html
> > 
> > 
> > 
> > You can see that the gear (part number 801) enters the transmission at a 45-degree angle, and is retained by a 17mm bolt that rides at a 90-degree angle to it (part 804).  If the end of your gear is broken, what you have to do is remove the bolt while retaining the gear with a pair of needlenose vice grips or whatever, and then carefully withdraw the gear from the transmission.   It has an O-ring that seals it against the inside of the sleeve to keep it from leaking oil, but if you goon it up, clink clank you'll drop the gear down inside the transmission.   Then you'd have to fish it out with a magnet which would be a major problem!   In the worst case, you'd have to take the gearbox out, and remove the bottom cover to extract it.
> > 
> > 
> > 
> > You can see from the first link that this gear is a pretty spendy part, so I hope you haven't broken it.   However, if you have, the good news is that I've got a brand new replacement gear in my NOS parts stash, still in its original Ford box, and I'll make you a better deal than the vendors ever would. :>)
> > 
> > 
> > 
> > You may have difficulty getting the angle drive off.   The nut threads onto the sleeve on the gearbox with a regular RH thread and is threaded onto the angle drive with LH thread.   Hopefully you can turn the nut and back the angle drive off.
> > 
> > 
> > 
> > Once it's in your hand, it's easy to test--just insert a screwdriver into the gearbox end, where there's a slot, and turn it.   If there's no corresponding turnage on the output side, then you have found the problem.   On the other hand, if it works, then look carefully at the end of the drive gear and you'll probably find a broken-off screwdriver end.
> > 
> > 
> > 
> > So, do the troubleshooting by removing the angle drive, and then let us know what you find out.   Thankfully most of the time the problem is the drive, and not the gear!   So it's a simple fix. :>)
> > 
> > 
> > 
> > Mike
> > _______________________________________________
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> 
> -- 
> Real life:   Thomas Törnblom             Email:  Thomas.Tornblom at Hax.SE
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