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Tow hook variations??

Old 10-10-2018, 09:33 PM
  #1  
merchauser
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Default Tow hook variations??

from what I have read, there are 3 different sized tow hooks found in the tool kit.

I have 2 of the earlier 14 or 15 mm hooks, that are much too small for my 1990.
I believe there are 2 different later model 20mm hooks??

anyone want to chime in and confirm?

would like to trade out these smaller ones for the correct one for my car
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Old 10-11-2018, 04:45 AM
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jpitman2
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You want 928 722 101 05, 20x 1/8 . Its actually 0.8" OD, 8 tpi Knuckle thread. The earlier part (ends in 03) , listed as 15x1/8, is close to 0.6" OD, also 8 tpi. Take care using it, as they are fragile, specially when pulled at an angle. Also check your front threaded socket for being usable, many have the alloy plug corroded in place. There used to be a tap for your thread around in US, but it seems to have disappeared in Europe a few years ago.
There were only the two types above. Some 911s used a finer thread, which obviously doesnt fit a 928, despite Carl F putting them forward.
jp 83 Euro S AT 57k
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Old 10-11-2018, 03:07 PM
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ROG100
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Tow hook 84 to 95 - Teeth 20 x 1/8"928 722 101 05
Tow Hook 78 to 83 - Teeth 15 x 1/8"928 722 101 03

I am also told there was another tow hook with a finer thread used on very early cars but I have never found a part number for it.
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Old 10-11-2018, 04:22 PM
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merchauser
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thanks roger

I have 2 of the smaller 15 mm tow hooks for the earlier cars.

anyone have a later 20mm style that would like to trade????
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Old 10-12-2018, 12:56 PM
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I will trade you your two early tow hooks for a new later hook.
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Old 10-12-2018, 01:48 PM
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merchauser
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DONE^^^^^^ thanks roger
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Old 10-12-2018, 07:23 PM
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Have you checked your front thread for usable???
jp 83 Euro S AT 57k
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Old 10-12-2018, 07:48 PM
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^^^^ no I have not looked at it. how is the cap removed?
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Old 10-12-2018, 10:24 PM
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If it has an alloy plug visible, it should accept an allen key to unscrew it - be ready for it to resist strongly. If something black, like a comforter, is visible, it should be rubber, and pull out with pliers.
See posts #87 and #97 in this thread for some pointers...
https://rennlist.com/forums/928-foru...-useful-7.html
jp 83 Euro S AT 57k
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Old 10-13-2018, 10:52 AM
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merchauser
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I have the black metal allen head plug. I made a very moderate attempt to remove, and got nowhere
will soak with some PB, and try again tomorrow.

it there another method to get this plug removed? and what is a better style of plug to keep in that hole?
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Old 10-13-2018, 02:17 PM
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The alloy plug and the steel threaded sleeve welded to the support like to corrode into one. Galvanic battery syndrome of some sort.

The steel thread sleeve has a small hole in the back that's handy for getting water and other stuff in to the threads inside. Helps build that desirable corrosion bond, and ls also great place to introduce your favorite penetrating lubricant to loosen. Access is a little inconvenient, through the cooling flaps on my '89, but possible with a long tube on the spray head. Soak the he!! out of it for a few weeks, and hope that's enough.

Use an impact-rated Allen driver, so less chance of breaking the end of the driver off in the fitting (as I did...). If it doesn't come out with pressure slightly less than the failure torque of the driver bit, you'll be able to drill the plug out with relative ease. You have the tow eye to determine the minor diameter of the threads in the sleeve. Drill progressively, and use left-handed bits if you can. Once you get the wall thin with drilling, you get to collapse and extract the remaining aluminum "sleeve".

The threads are not a common size. The tap you might need for thread cleanup won't be at the local hardware store. A few have purchased the tap and some have shared it around on a pay-it-forward basis. The OC may have one in their tool lend program. Good reason to become a member.

The GTS came with a rubber plug with a pull ring to replace the aluminum plug. Our vendors have them for not much $. Get one for the rear too. I stuffed the cleaned threads with Vaseline and installed the rubber plugs front and rear.
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Old 10-13-2018, 07:04 PM
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I attempted to remove the alloy plug from my 89. Ended up taking most of a day from my life that I will never get back. I ended up having to alternate between drill and Dremel and pick to get it completely out.
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Old 10-14-2018, 02:57 AM
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I spent a long morning with small drill bits, working my way around the hardened Allen driver bit I'd managed to break off in the plug. Eventually I connected the dots and had a hole I could drill larger. I made that as big as I dared with a drill bit, then carefully sawed relief slots in what was left. Collapsed the major remaining bits with a cape chisel and small hammer. Then like John and many others, I used dental picks to remove the bits of plug metal still in the threads of the sleeve. I was lucky to have another list member loan me the correct tap, so I could clean the threads in the sleeve completely, vs trying to completely finish the job with the picks alone.

This was definitely not my favorite job on the car.
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Old 10-14-2018, 10:30 AM
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Bertrand Daoust
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Unfortunately (or fortunately!), the original alloy plug was missing when I purchased my car.
Went with a new rubber one.
Fits perfectly well.
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Old 10-14-2018, 11:15 AM
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Originally Posted by ROG100 View Post
Tow hook 84 to 95 - Teeth 20 x 1/8"928 722 101 05
Tow Hook 78 to 83 - Teeth 15 x 1/8"928 722 101 03

I am also told there was another tow hook with a finer thread used on very early cars but I have never found a part number for it.
78-only super-fine thread - 928 722 101 02




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