Re: Mystery Nut--Anyone Identify?
 

<ah1244@wayne.edu> wrote
> >From that photo, looks like one of those Castle nuts or
> >Self-locking
> nuts from the front suspension. There are 4 identical
> sized nuts (all
> 12x1.25 mm)

Is that 12 mm the nominal diamter of the suspension bolts
onto which these suspension self-locking nuts fit, though?
That sounds more likely.

The 12 mm I mention for this mystery nut is the nut head
measurement. That is, a 12 mm socket fits it. The nominal
diameter of its corresponding stud appears to be 6 mm or 8
mm. (The stud diameter is a little hard to measure while
it's stuck in the nut.)

Thanks for the input. I'll update tomorrow, hopefully.

Re: Mystery Nut--Anyone Identify?
 

Elle wrote:
>
> Is that 12 mm the nominal diamter of the suspension bolts
> onto which these suspension self-locking nuts fit, though?
> That sounds more likely.
>
> The 12 mm I mention for this mystery nut is the nut head
> measurement. That is, a 12 mm socket fits it. The nominal
> diameter of its corresponding stud appears to be 6 mm or 8
> mm. (The stud diameter is a little hard to measure while
> it's stuck in the nut.)
>

Most 12 mm nuts on a Honda are threaded for an 8 x 1.25 mm bolt.

Eric

Re: Mystery Nut--Anyone Identify?
 

Elle wrote:
>
> Is that 12 mm the nominal diamter of the suspension bolts
> onto which these suspension self-locking nuts fit, though?
> That sounds more likely.
>
> The 12 mm I mention for this mystery nut is the nut head
> measurement. That is, a 12 mm socket fits it. The nominal
> diameter of its corresponding stud appears to be 6 mm or 8
> mm. (The stud diameter is a little hard to measure while
> it's stuck in the nut.)
>

Most 12 mm nuts on a Honda are threaded for an 8 x 1.25 mm bolt.

Eric

Re: Mystery Nut--Anyone Identify?
 

Elle wrote:
>
> Is that 12 mm the nominal diamter of the suspension bolts
> onto which these suspension self-locking nuts fit, though?
> That sounds more likely.
>
> The 12 mm I mention for this mystery nut is the nut head
> measurement. That is, a 12 mm socket fits it. The nominal
> diameter of its corresponding stud appears to be 6 mm or 8
> mm. (The stud diameter is a little hard to measure while
> it's stuck in the nut.)
>

Most 12 mm nuts on a Honda are threaded for an 8 x 1.25 mm bolt.

Eric

Re: Mystery Nut--Anyone Identify?
 

Hello: I just checked the stud/nut diameters with a caliper after your
and Elle's posts. Yes, you two are correct: the 12x1.25 mm that Honda
manual refers to is the stud diameter and not the nut diameter (should
have remembered this...my apologies). For the 12 mm diameter nut Elle
refers to, looks like the corresponding stud size is 8 mmx1.25 mm as
Eric correctly suggests. If yours came from the front suspension, there
is just one such self-locking-nut according to the front suspension
diagram; 8x1.25 mm, stabilizer bar /lower arm attachment. According to
the diagram, in the front suspension, there are
6 of 12x1.25 mm self-locking/castle nuts (missed two of these in my
earlier post!)
5 of 10x1.25 mm
1 of 8x1.25 mm; all self-locking or castle nuts. As Eric and you
indicate correctly, the 12, 10 or 8 referred to in the diagram are for
the stud diameter.

Re: Mystery Nut--Anyone Identify?
 

Hello: I just checked the stud/nut diameters with a caliper after your
and Elle's posts. Yes, you two are correct: the 12x1.25 mm that Honda
manual refers to is the stud diameter and not the nut diameter (should
have remembered this...my apologies). For the 12 mm diameter nut Elle
refers to, looks like the corresponding stud size is 8 mmx1.25 mm as
Eric correctly suggests. If yours came from the front suspension, there
is just one such self-locking-nut according to the front suspension
diagram; 8x1.25 mm, stabilizer bar /lower arm attachment. According to
the diagram, in the front suspension, there are
6 of 12x1.25 mm self-locking/castle nuts (missed two of these in my
earlier post!)
5 of 10x1.25 mm
1 of 8x1.25 mm; all self-locking or castle nuts. As Eric and you
indicate correctly, the 12, 10 or 8 referred to in the diagram are for
the stud diameter.

Re: Mystery Nut--Anyone Identify?
 

Hello: I just checked the stud/nut diameters with a caliper after your
and Elle's posts. Yes, you two are correct: the 12x1.25 mm that Honda
manual refers to is the stud diameter and not the nut diameter (should
have remembered this...my apologies). For the 12 mm diameter nut Elle
refers to, looks like the corresponding stud size is 8 mmx1.25 mm as
Eric correctly suggests. If yours came from the front suspension, there
is just one such self-locking-nut according to the front suspension
diagram; 8x1.25 mm, stabilizer bar /lower arm attachment. According to
the diagram, in the front suspension, there are
6 of 12x1.25 mm self-locking/castle nuts (missed two of these in my
earlier post!)
5 of 10x1.25 mm
1 of 8x1.25 mm; all self-locking or castle nuts. As Eric and you
indicate correctly, the 12, 10 or 8 referred to in the diagram are for
the stud diameter.

Re: Mystery Nut--Anyone Identify?
 

<ah1244@wayne.edu> wrote in message
news:1147919073.679969.107510@j33g2000cwa.googlegr oups.com...
> >From that photo, looks like one of those Castle nuts or Self-locking
> nuts from the front suspension. There are 4 identical sized nuts (all
> 12x1.25 mm) but with different torque settings (page 18-8 of service
> manual; 1991 Civic). One on top of the strut housing, and two at the
> bottom, and another one at the end of the control arm. If you need the
> diagram, do drop a line, and I will scan the page and send it over.
> Hope this helps......
>
That's what it looks like to me - a high-temperature locking nut.

Mike

Re: Mystery Nut--Anyone Identify?
 

<ah1244@wayne.edu> wrote in message
news:1147919073.679969.107510@j33g2000cwa.googlegr oups.com...
> >From that photo, looks like one of those Castle nuts or Self-locking
> nuts from the front suspension. There are 4 identical sized nuts (all
> 12x1.25 mm) but with different torque settings (page 18-8 of service
> manual; 1991 Civic). One on top of the strut housing, and two at the
> bottom, and another one at the end of the control arm. If you need the
> diagram, do drop a line, and I will scan the page and send it over.
> Hope this helps......
>
That's what it looks like to me - a high-temperature locking nut.

Mike

Re: Mystery Nut--Anyone Identify?
 

<ah1244@wayne.edu> wrote in message
news:1147919073.679969.107510@j33g2000cwa.googlegr oups.com...
> >From that photo, looks like one of those Castle nuts or Self-locking
> nuts from the front suspension. There are 4 identical sized nuts (all
> 12x1.25 mm) but with different torque settings (page 18-8 of service
> manual; 1991 Civic). One on top of the strut housing, and two at the
> bottom, and another one at the end of the control arm. If you need the
> diagram, do drop a line, and I will scan the page and send it over.
> Hope this helps......
>
That's what it looks like to me - a high-temperature locking nut.

Mike

Re: Mystery Nut--Anyone Identify?
 

I took the exhaust manifold shroud off today. It is indeed
an exhaust manifold nut (with broken-off stud stuck in it).
It's the one nearest the distributor.

I am amazed at how many people (Nasty, Tegger, Eric,
SoCalMike) nailed this, and with a fuzzy photo, too. What a
phenomenal newsgroup!

I see the stud on sale at Majestic online for a couple
bucks.

I reckon I'll see how my ball joint castle nut/stud work
goes today and then make a trip to the junkyard. I think the
front desk man and I could become an item... :-)

Much obliged for everyone's input. This all is valued work
to me, and I couldn't do it nearly as efficiently (and at
some points, not at all) without the extensive experience of
so many of you.

Re: Mystery Nut--Anyone Identify?
 

I took the exhaust manifold shroud off today. It is indeed
an exhaust manifold nut (with broken-off stud stuck in it).
It's the one nearest the distributor.

I am amazed at how many people (Nasty, Tegger, Eric,
SoCalMike) nailed this, and with a fuzzy photo, too. What a
phenomenal newsgroup!

I see the stud on sale at Majestic online for a couple
bucks.

I reckon I'll see how my ball joint castle nut/stud work
goes today and then make a trip to the junkyard. I think the
front desk man and I could become an item... :-)

Much obliged for everyone's input. This all is valued work
to me, and I couldn't do it nearly as efficiently (and at
some points, not at all) without the extensive experience of
so many of you.

Re: Mystery Nut--Anyone Identify?
 

I took the exhaust manifold shroud off today. It is indeed
an exhaust manifold nut (with broken-off stud stuck in it).
It's the one nearest the distributor.

I am amazed at how many people (Nasty, Tegger, Eric,
SoCalMike) nailed this, and with a fuzzy photo, too. What a
phenomenal newsgroup!

I see the stud on sale at Majestic online for a couple
bucks.

I reckon I'll see how my ball joint castle nut/stud work
goes today and then make a trip to the junkyard. I think the
front desk man and I could become an item... :-)

Much obliged for everyone's input. This all is valued work
to me, and I couldn't do it nearly as efficiently (and at
some points, not at all) without the extensive experience of
so many of you.

Re: Mystery Nut--Anyone Identify?
 

"Elle" <honda.lioness@nospam.earthlink.net> wrote in
news:hIkbg.4307$y4.4095@newsread2.news.pas.earthli nk.net:

> I took the exhaust manifold shroud off today. It is indeed
> an exhaust manifold nut (with broken-off stud stuck in it).
> It's the one nearest the distributor.
>
> I am amazed at how many people (Nasty, Tegger, Eric,
> SoCalMike) nailed this, and with a fuzzy photo, too. What a
> phenomenal newsgroup!



Broken studs are very common. I had one too. Mine broke below the surface
of the head. My mechanic removed it, but wouldn't tell me how (trade
secret, or so he says...). It was done at the same time as my head gasket
replacement, so the machine shop that trued the head probably did it.

The problem is that exhaust pulses are quite violent. This is the reason
you need heat-resistant "prevailing torque" nuts. The nuts don't vibrate
off, but the pulses often break a stud.

Funny, the one that broke on mine was the one nearest the timing belt. It
must be a random thing.


--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/

Re: Mystery Nut--Anyone Identify?
 

"Elle" <honda.lioness@nospam.earthlink.net> wrote in
news:hIkbg.4307$y4.4095@newsread2.news.pas.earthli nk.net:

> I took the exhaust manifold shroud off today. It is indeed
> an exhaust manifold nut (with broken-off stud stuck in it).
> It's the one nearest the distributor.
>
> I am amazed at how many people (Nasty, Tegger, Eric,
> SoCalMike) nailed this, and with a fuzzy photo, too. What a
> phenomenal newsgroup!



Broken studs are very common. I had one too. Mine broke below the surface
of the head. My mechanic removed it, but wouldn't tell me how (trade
secret, or so he says...). It was done at the same time as my head gasket
replacement, so the machine shop that trued the head probably did it.

The problem is that exhaust pulses are quite violent. This is the reason
you need heat-resistant "prevailing torque" nuts. The nuts don't vibrate
off, but the pulses often break a stud.

Funny, the one that broke on mine was the one nearest the timing belt. It
must be a random thing.


--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/