[Healeys] Brake backing plate bolts

[john harper]

Michael

This reminds me of a major problem that I had with Nyloc nuts. When I was
working on a BN1 rear hub a well-known supplier offered me Nylocs rather
than the standard all-metal wheel nuts.

I fitted the nuts and torqued up to the usual figure of about 65 pounds-feet.
After some miles of running the hub extension became loose and started to
work through the wheel studs. I managed to stop with only two studs
remaining. I was lucky because I could have lost the whole wheel on a busy
A road.

After checking I realized that using Nyloc nuts torqued to the standard
tightness was not right. I now, if I use them at all. fit the nuts and test
what torque reading is used just to turn the nut loose on the wheel stud;
it is about 20 pounds-feet in my case. I then add this torque measurement
to give about 85 pounds-feet; 20 for the nut and 65 left to do the job as
originally intended

On Mon, 9 May 2022 at 17:02, Michael Salter <michaelsalter at gmail.com> wrote:

> Yep Richard according to the parts books that's correct for 6 cylinder
> cars.
> As a matter of interest the late BN1's and BN2's ( 5 stud hub) use 8 plain
> nuts but call for only 4 spring washers?? Weird ... I'll have to look into
> that one ... there has to be a good reason.
>
> M
>
> On Mon., May 9, 2022, 11:41 a.m. Ricchardd Mayor, <boyracer466 at gmail.com>
> wrote:
>
>> Mark,
>>
>> I checked another rear end yesterday that had never been apart and it
>> also has the nyloc nuts and no washers.
>>
>> Richard Mayor
>> boyracer466 at gmail.com
>>
>>
>> On May 7, 2022, at 6:21 PM, Michael Oritt via Healeys <
>> healeys at autox.team.net> wrote:
>>
>> Mark--
>>
>> Since the bolts are not--or at least should not--be rotating you don't
>> need lock washers.
>> Yes, you should have flat washers under both the bolt and nut to
>> spread the load.
>>
>> Best--Michael Oritt
>>
>> On Sat, May 7, 2022 at 6:27 PM Mark Donaldson via Healeys <
>> healeys at autox.team.net> wrote:
>>
>>> Learned gentlemen,
>>>
>>>
>>>
>>> When I took the backing plates off the rear axle of my ’62 BT7 race car
>>> the four bolts each side had Nyloc nuts, with lock washers underneath.
>>>
>>> With the lock washer in place the top of the thread did not connect with
>>> the nylon – but it did with the washer removed.
>>>
>>> The parts book shows just the bolts and nuts.  It does not show any
>>> washers.
>>>
>>> As the car was built in Hayward, CA, in the mid-seventies as a track
>>> car, there is much about it which is not standard.
>>>
>>>
>>>
>>> My questions are:
>>>
>>>    1. Are the Nyloc nuts correct and, if not, what should be there?
>>>    2. Is it correct to have no washers under the nuts?  I would have
>>>    though it correct to have at least a thin flat washer, even though the
>>>    parts book appears to show none.
>>>
>>>
>>>
>>> Mark
>>>
>>>
>>>
>>> Ardmore
>>>
>>> NZ
>>>
>>>
>>>
>>> <image002.png>
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