[DeTomaso] ZF Reverse switch threads repair, all done

Tue Jul 23 19:48:40 EDT 2024

I used the spark plug thread repair part and thin nut Julian suggested.

1)  threaded a couple on the nut onto the repair part and shortened the repair part;

2)  threaded the hole for M12 and screwed  the repair part in using red loctite;

3)  let the locktite set for a day then threaded one of the thin nuts on, again with red loctite;

4)  let the locktite set for a day then cut away a little excess material on the inside.

I may have to use thin washers vs the adjusting nut, nut it looks like it will work.

Photos attached.

If anyone has the same repair to do, I have a bunch of the repair parts and nuts.

Ken

On Sunday, June 30, 2024 at 06:51:00 PM PDT, Julian Kift <julian_kift at hotmail.com> wrote: 

Mike,

There are 3 solutions that have been discussed in this thread I am aware of.

    1.  
Helicoil - the traditional 80's spring like thread repair.

    2.  
Thread Sert - The major brand is Time Sert, it's an internal thread (the one you want to replace) and threaded exterior barrel, one has to drill and tap an oversize hole then thread the Time Sert in, securing it using Loctite. These are way better than helicoils and my go to for thread repair where three's enough meat to drill out a larger hole.

        1.  
    For the M10 x1.0 internal thread the external is a M12 x 1.0  https://www.amazon.com/Camrusic-M10x1-0-M12x1-0-Stainless-Automotive/dp/B0BW91RF1N/ref=pd_lpo_sccl_2/144-2832585-1005556?pd_rd_w=Pgxk1&content-id=amzn1.sym.4c8c52db-06f8-4e42-8e56-912796f2ea6c&pf_rd_p=4c8c52db-06f8-4e42-8e56-912796f2ea6c&pf_rd_r=F7XTSSX3PBVA73MHQ8Z8&pd_rd_wg=EOuJ6&pd_rd_r=23c2b9f7-e31f-446a-8a2a-abd26d630c76&pd_rd_i=B0BW91RF1N&th=1

        2.  
    and get a thin jam nut for the inside  https://belmetric.com/nuts/jam-thin-nuts/?DiameterThread2=M12X1.0__Super__Fine&filterPage=1

    3.  
Nutsert or Rivnut - an internal threaded pop rivet.

In Ken's case if using a Rivnut he'll just need to make sure it doesn't protrude into the housing to an extent it prevents linkage selecting reverse gear. As the housing is so thin one could use a Time Sert and get a thin nut to clamp it through the hole and cut it down to the nut per 2. above.

Julian
________________________________ 
From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of Mike Drew via DeTomaso <detomaso at server.detomasolist.com>
Sent: Sunday, June 30, 2024 4:32 PM
To: Jeff Cobb <jeffcobb1 at me.com>
Cc: Ken Green <kenn_green at yahoo.com>; Detomaso Email List <detomaso at detomasolist.com>
Subject: Re: [DeTomaso] ZF Reverse switch nuts 

Jeff,

Google doesn’t know what a ‘thread seat’ is, except for stitching on a seat.

Do you mean nutserts, also known as rivnuts?

That sounds like the superior solution to me, far better than a helicoil. One would have to be sure they didn’t interfere with the movement of the linkage but I think there is enough room.

Unless these mystical thread seats are some third solution?

Mike

Sent from my iPhone

> On Jun 30, 2024, at 16:19, Jeff Cobb via DeTomaso <detomaso at server.detomasolist.com> wrote:
>
> Thread seats are levels more secure than helicoils.
> Jeff Cobb
>
> Sent from my brain.
>
>> On Jun 30, 2024, at 6:15 PM, Mike Drew via DeTomaso <detomaso at server.detomasolist.com> wrote:
>>
>> Ken,
>>
>> Very strange. I assume somebody removed material for some weird reason?
>>
>> I do like the Nutsert idea. That sounds like the most optimal solution.
>>
>> Mike
>>
>> Sent from my iPad
>>
>>>> On Jun 30, 2024, at 14:51, Ken Green <kenn_green at yahoo.com> wrote:
>>>
>>> Here is a photo, I assume someone removed some metal for an unknown reason:
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>> On Saturday, June 29, 2024 at 11:28:16 PM PDT, Mike Drew via DeTomaso <detomaso at server.detomasolist.com> wrote:
>>>
>>>
>>>
>>>
>>>
>>> Ken,
>>>
>>> The cover metal is generally thin but there is a slightly thicker boss in which the threads for the reverse light switch are cut. I don’t have much helicoil experience but I think it could respond well to that treatment?
>>>
>>> Mike
>>>
>>> Sent from my iPad
>>>
>>>>> On Jun 29, 2024, at 19:15, Ken Green via DeTomaso <detomaso at server.detomasolist.com> wrote:
>>>>
>>>> Some time in the past 50 years someone stripped or? the threads. I found this:
>>>>
>>>>  https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.amazon.com%2FSealey-10mm-Replacement-Inserts-VS311%2Fdp%2FB0074IJWYQ%2Fref%3Dcm_cr_arp_d_product_top%3Fie%3DUTF8&data=05%7C02%7C%7Cbb178720f35b4996ef0808dc995cf9cd%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638553871838158694%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=ofk9WCfg8fXmVDj00xbG%2FAWHjbCxyW64eWCV57ZKtcA%3D&reserved=0
>>>>
>>>> for restoring diesel glow plug 10m-1.0 threads and outside threads appear to be M12.  I don't know why, but the metal the switch threads into is really thin, probably too thin to tap.  I think I could use the glow plug insert with a thin M12 nut on the inside?
>>>>
>>>> Ken
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>> On Saturday, June 29, 2024 at 03:12:12 PM PDT, Mike Drew via DeTomaso <detomaso at server.detomasolist.com> wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> However sometimes people get too rambunctious and strip out the hole. The switch is supposed to thread into the hole and be secured with the single nut. If the hole is stripped the switch can just fall out. That then requires creativity and a thin nut on the inside to hold it.
>>>>
>>>> Mike
>>>>
>>>>
>>>>
>>>> Sent from my iPhone
>>>>
>>>>>> On Jun 29, 2024, at 07:38, Larry Stock <larrys at panteraparts.com> wrote:
>>>>>
>>>>> The housing is threaded so just one jam nut is required to adjust
>>>>> Larry
>>>>>
>>>>> On 6/28/24, 10:12 PM, "DeTomaso on behalf of Ken Green via DeTomaso" <detomaso-bounces at server.detomasolist.com <mailto:detomaso-bounces at server.detomasolist.com> on behalf of detomaso at server.detomasolist.com <mailto:detomaso at server.detomasolist.com>> wrote:
>>>>>
>>>>>
>>>>> Are there 2 thin nuts that sandwich the housing or just one that tightens the switch body against the housing?
>>>>>
>>>>>
>>>>> Thanks
>>>>>
>>>>>
>>>>> Ken
>>>>> _______________________________________________
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