Bonnet hinge brass fitting

[nefematic]

The front frame ends left/right with a brass fitting to take the bolt and steel fitting from the bonnet hinge. I've managed to loosen not the bolt, but the brass fitting completey out of the steel pipe. So now I cannot get the bolt out of the brass fitting, tried heat and all. My usual supplier doesn't carry this part.

Can someone point me to where I can get the brass fitting to fit back in the frame?

Thanks.

Martin

Looks something like this:

[paulsco]

Hi Martin,
As far as I know it is not brass, it is steel.
It is however brazed into the end of the tube.
Is the bolt broken?

If not, perhaps the best thing to do is braze it back in and get a spanner or air impact gun on it. the heat will hopefully help and if possible nip it up a little first to break the rust seal.

Paul

[288gto]

Martin, it's not brass but rather a machined and threaded steel insert that is then brazed into the end of the bonnet support tube.
You can either clean up and re drill and re tap the one you have and then get it brazed again or probably better to get a local engineering shop to make you a new one. The actual bonnet hinge pins are readily available though.

Simon

[nefematic]

Thanks. Heating the bolt made it unbraze in the first place. Then trying to get the bolt loose with the hinge still on the bonnet I broke the bolt.

I've filed into the part, the part inserting into the bonnet support frame tube is steel, the shoulderd part with the greater diameter is definitely brass. Heat caused it to debraze in the first place so I'm getting the rest of the bolt out before it's brazed back in place. I lost my tapping set so I first have to get a new one before drilling. I already have the new sleeves and poly's. If needs be I guess I'll have one machined (steel then). See the pics, see the brass!

[288gto]

Martin, I promise it's all steel, the brass you can see is the brazing. If you cut deeper into it, it will be steel. I know because mine did the same on my original frames. In the end I got new frames from Uryk but only because I thought this would be better in the long term. Assuming the rest of the tube is in good condition this is an easy repair. It's just one of the joys of dismantling an old e type!

Simon

[JD-JAG66]

I have a similar problem with the "bonnet hinge bolt fittings" on my bonnet support frame.
Basically the thread is completely gone on both sides. Which I discovered on the day I had invited several friends over to help me fit the bonnet.
No worries, I have a "rethreading tapping "kit. So I got to work on it this afternoon.
Unfortunately no matter what I tried, I could not make an impact on any side of the support frame.
Since I do not really fancy buying a new bonnet support frame, any suggestions?

Update.
I had used the imperial thread bolts supplied by SNG for this purpose. Other posts on this topic mention that the thread on the inserts in the frame are Metric. Which I can accept considering how the imperial bolts were damaged when i tried fitting them. Will have a chat with SNG barratt.

Cheers

[Hugo]

The bolts are 3/8" UNF. The insert is steel, but it has absorbed some brass from the brazing process. Dig down and you will find steel underneath. It would take five minutes to make one of these inserts on a lathe - less time than you will spend trying to drill the bolt out & clean the thread.
This is one of the few areas of the E Type that I have personal experience of - one of the inserts on my car fell out & I had to braze it back in.
Did you say you broke the bolt while heating the insert - you didn't get it hot enough! Get it cherry red & it will fall out. Heat will shift anything!

[JD-JAG66]

I got the bolts out. Both sides. But the thread is completely gone. Considering the bolts have a 9 mm diameter, I will see first if I can drill out the hole to 10mm and rethread. If not, guess I will try heating as you suggested.

[Hugo]

You might just get away with it - 3/8" is 9.6mm. Not a lot of meat on the female thread though. But then, there doesn't have to be - they don't relly have to do a lot. I would just nip them up & Loctite them in.
A 10mm bolt probably won't go through the 9/16" hole in the other bit though, so that may need drilling out.
Or you could tap them out a bigger size & make up a stepped stud. Is it both sides that have gone? If it's just the one that's out, it's easiest to make a new one.

[JD-JAG66]

I just got a mail from SNG, in which they mention that they tried out the bolts they supplied on the bonnet support frame and they screwed right in.
I did not know upon the metric thread until I read it in this forum (=here is to hoping I read it right), so I guess there must be frames with a Imperial thread as well as metric thread? Anybody?

[Hugo]

Mine are 3/8" UNF, (which = 9.6mm). Are you saying yours are metric? if they are, I would guess soebody has tapped them out in the past.
While you're here - may I ask a favour? I am looking at a Carver One on eBay, but it's in Italy and the text is in Italian! It reads as follows; “MOTO CARVER ONE POCHISSIMI ESEPLARI IN PERFETTO STATO D'USO. MOTA DA COLLEZIONE.", which I imaginemeans something like 'very beautiful example in perfect working order.' Am I about right? The item no, is 142416475247 if anybody is interested in these crazy machines.

[angelw]

Hello JD,
As Hugo states, its most likely that someone has previously tapped the holes to a metric size, if your bolts are metric.

If it is metric, the closest size to 3/8 unf would be 10mm and If the Threads are stuffed, I would bring them back to factory original size by fitting Heli-Coils. Even to "off hand" drill the holes to the Heli-Coil tapping size, the drill will tend to follow the existing hole if you have the drill reasonably aligned.

Regards,

Bill

[JD-JAG66]

Thanks guys.

Hugo, the description translation basically says
Moto Carver One, very few build, in perfect used condition, collector's bike.

Further description on the bottom of the page
MOTO CARVER ONE CABRIO BREVETTO BMW-TOYOTA POCHISSIMI ESEMPLARI MOTO FUNZIONANTE IN ORDINE.
CONTATTARE PER EVENTUALI CHIARIMENTI.

Moto Carver One Convertible, "Copyright" BMW-Toyota, very few build. Bike in running and functioning order.
Please contact for further clarifications.

Good luck?

[Hugo]

Thank you so much! Don't know what BMW / Toyota have got to do with it - these things have a little Daihatsu engine. He had a starting bid of $1,000. I bid it up to the reserve of $20,000, but now somebody has taken it up a couple of hundred more ;-(