Discovery Caliper bolt size

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HI

I wonder if anyone can confirm the head size of the bolts that hold on
the
rear brake callipers on an early Discovery I?

It appears to be 16mm but both my spanner and socket are not tight
fits, so
before I go and buy a new socket I would like to confirm the size and
be
sure that they are not A/F.

Regards
Jeff

 
[email protected] wrote:
> HI
>
> I wonder if anyone can confirm the head size of the bolts that hold on
> the
> rear brake callipers on an early Discovery I?
>
> It appears to be 16mm but both my spanner and socket are not tight
> fits, so
> before I go and buy a new socket I would like to confirm the size and
> be
> sure that they are not A/F.
>
> Regards
> Jeff


You're approaching this the wrong way!

Corrosion could result in a hex. size anything between what it was and
something much, much smaller. The only sensible way to do this is to
have a handful of sockets at hand and use that which has the tightest
fit (slightly hammered on tight is suggested).

Remember that if you mess up the bolt head you will have a major
problem on your hands. Get it right first time and be prepared to
replace the bolts when you put it back together.

Either buy several sockets, a mixture of imperial and metric even
Whitworth, or borrow some. Don't use the borrowed socket as a gauge,
go out and buy a similar sized one and use that. It's almost
guaranteed to be the poor fit.
 

> You're approaching this the wrong way!
>
> Corrosion could result in a hex. size anything between what it was and
> something much, much smaller. The only sensible way to do this is to
> have a handful of sockets at hand and use that which has the tightest
> fit (slightly hammered on tight is suggested).
>
> Remember that if you mess up the bolt head you will have a major
> problem on your hands. Get it right first time and be prepared to
> replace the bolts when you put it back together.
>
> Either buy several sockets, a mixture of imperial and metric even
> Whitworth, or borrow some. Don't use the borrowed socket as a gauge,
> go out and buy a similar sized one and use that. It's almost
> guaranteed to be the poor fit.


Thanks for the reply Dougal.

The heads are not badly corroded, and there is no way a 15mm socket
would hammer on, so before I go and get any new sockets, metric or A/F,
I was just trying to find out what the satrting point was. It may just
be that my 16mm is knackered!!

Reagrds
Jeff

 
Jeff wrote:

>>You're approaching this the wrong way!
>>
>>Corrosion could result in a hex. size anything between what it was and
>>something much, much smaller. The only sensible way to do this is to
>>have a handful of sockets at hand and use that which has the tightest
>>fit (slightly hammered on tight is suggested).
>>
>>Remember that if you mess up the bolt head you will have a major
>>problem on your hands. Get it right first time and be prepared to
>>replace the bolts when you put it back together.
>>
>>Either buy several sockets, a mixture of imperial and metric even
>>Whitworth, or borrow some. Don't use the borrowed socket as a gauge,
>>go out and buy a similar sized one and use that. It's almost
>>guaranteed to be the poor fit.

>
>
> Thanks for the reply Dougal.
>
> The heads are not badly corroded, and there is no way a 15mm socket
> would hammer on, so before I go and get any new sockets, metric or A/F,
> I was just trying to find out what the satrting point was. It may just
> be that my 16mm is knackered!!
>
> Reagrds
> Jeff


The old hex headed ones were 5/8" A/F and the later ones 12pt 14mm A/F
I think.

Don't get hung up on whether it should be imperial, metric or
Whitworth - just make sure that it's tight! If that means a 'metric'
socket on an 'imperial' bolt so be it.

5/8", 3/8" Whit/BSF(Current series), 19/32", and 15mm would be
starters for the 5/8" hex.

14mm, 5/16" Whit/BSF(Current series) and 13mm would be starters for
the 12pt.

Your 16mm was too big for anything but you get the idea, a worn
undersize socket may be just what you need.
 

Thanks Dougal

5/8" A/F sounds like the size, that would account for why 16mm is not a
tight fit.
It looks like a new 5/8" socket is the staring point (my 15mm isn't
that worn!!)

Reagrds
Jeff

 
On or around 1 Sep 2006 07:25:53 -0700, "Jeff" <[email protected]> enlightened
us thusly:

>
>> You're approaching this the wrong way!
>>
>> Corrosion could result in a hex. size anything between what it was and
>> something much, much smaller. The only sensible way to do this is to
>> have a handful of sockets at hand and use that which has the tightest
>> fit (slightly hammered on tight is suggested).
>>
>> Remember that if you mess up the bolt head you will have a major
>> problem on your hands. Get it right first time and be prepared to
>> replace the bolts when you put it back together.
>>
>> Either buy several sockets, a mixture of imperial and metric even
>> Whitworth, or borrow some. Don't use the borrowed socket as a gauge,
>> go out and buy a similar sized one and use that. It's almost
>> guaranteed to be the poor fit.

>
>Thanks for the reply Dougal.
>
>The heads are not badly corroded, and there is no way a 15mm socket
>would hammer on, so before I go and get any new sockets, metric or A/F,
>I was just trying to find out what the satrting point was. It may just
>be that my 16mm is knackered!!


if 16mm doesn't fit right, they're possibly 5/8" AF. some of the disco rear
calipers were UNF bolts, not metric.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"My centre is giving way, my right is in retreat; situation excellent.
I shall attack. - Marshal Foch (1851 - 1929)
 
On or around 1 Sep 2006 08:34:55 -0700, "Jeff" <[email protected]> enlightened
us thusly:

>
>Thanks Dougal
>
>5/8" A/F sounds like the size, that would account for why 16mm is not a
>tight fit.
>It looks like a new 5/8" socket is the staring point (my 15mm isn't
>that worn!!)


yep.

metric ones tend to be 12-point 13mm anyway.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"My centre is giving way, my right is in retreat; situation excellent.
I shall attack. - Marshal Foch (1851 - 1929)
 
Why do caliper and supension bolts often seem to be AF?

On my saab, everything is metric except for the shock nuts, caliper
bolts and some of the axle fittings.
 
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