Alfa Romeo Forums banner

1 - 19 of 19 Posts

·
Registered
Joined
·
192 Posts
Discussion Starter #1
Hi All,
has anyone had to locate a source for the large headed screw that connects the Trunnions on the Duetto convertible top side frames to the header? I’m pretty sure I know what the answer is going to be but thought it was worth a try to ask.
thanks for looking!
Mark
 

Attachments

·
Registered
Joined
·
736 Posts
Check out Autoricambi they are a Fiat parts shop Look under the early 124 Spider under convertible top section They have 3 or 4 different type of trunnion screws that may work for what you need
 

·
Registered
Joined
·
191 Posts
Hi All,
has anyone had to locate a source for the large headed screw that connects the Trunnions on the Duetto convertible top side frames to the header?

Mark
Mark, I’ve reproduced all the fasteners for the duetto top frame, drop me a pm if interested.

Nick.
 

·
Registered
Joined
·
192 Posts
Discussion Starter #5
Mark, I’ve reproduced all the fasteners for the duetto top frame, drop me a pm if interested.

Nick.
great! i just ordered one of the fasteners that Autoricambi sells, from the tip STPHRS gave me. i'm not exactly sure it will work (as they didn't know how long the fastener is, and couldn't get eyes on one), but if it doesn't fit i'll give you a shout. i'm not worried about how it looks of course, as it's covered by the top, but i want to make sure it'll do the job correctly so as to not cause a crack in one of those aluminum side rails.
thanks for replying.
Mark
 

·
Registered
Joined
·
203 Posts
great! i just ordered one of the fasteners that Autoricambi sells, from the tip STPHRS gave me. i'm not exactly sure it will work (as they didn't know how long the fastener is, and couldn't get eyes on one), but if it doesn't fit i'll give you a shout. i'm not worried about how it looks of course, as it's covered by the top, but i want to make sure it'll do the job correctly so as to not cause a crack in one of those aluminum side rails.
thanks for replying.
Mark
FYI-I just checked the dimensions of the autoricambi and they are not the correct dimensions. I would contact VeloceSA. I'm having a friend /machinist make some for me.
 

·
chiuso per ferie
Joined
·
11,806 Posts

·
Registered
Joined
·
1,811 Posts
And you can get them in stainless steel and they never show anyway. I put in a TimeSert and some antiseize.
Brian will tell you how many, many hours I spent getting this area of the convertible top in working condition again post seized hardware. Luckily I did not break anything.
 

·
Registered
Joined
·
192 Posts
Discussion Starter #11
Mark, I’ve reproduced all the fasteners for the duetto top frame, drop me a pm if interested.

Nick.
To follow up on this thread, I bought one of the bolts sold through Autoricambi for a Fiat 124 and sure enough it didn’t work :( . The diameter and shoulder length were perfect but the thread pitch is wrong. I threw a regular M8 bolt in there and it works of course but doesn’t allow for the slight amount of movement that the original slotted, shoulder screw does. I’m guessing that movement works in conjunction with the lateral movement the Trunions provide to keep the bow from binding up when being latched.
so yes! If you have any of those slotted shoulder screws you‘ve reproduced available, I’d love to get one from you Nick!
regards
Mark
 

·
Registered
Joined
·
1,811 Posts
Put something in there so the next enthusiast is not fighting a seized bolt.
All those bolts and trunnions get jammed up on the frames and are a real bear to get out on the originals. The pins break and you need a specialist to help restore the rear pins. Luckily, there are good people out there to help.
 

·
Registered
Joined
·
1,811 Posts

 

·
Registered
Joined
·
192 Posts
Discussion Starter #14
Put something in there so the next enthusiast is not fighting a seized bolt.
All those bolts and trunnions get jammed up on the frames and are a real bear to get out on the originals. The pins break and you need a specialist to help restore the rear pins. Luckily, there are good people out there to help.
Yeah I reassembled everything with anti seize compound so as to prevent any future seizings😁
 

·
Registered
Joined
·
191 Posts
Hi Mark,

You confirmed the information another board member gave me. It would appear that there are at least two different versions of the trunnions and screws. The originals from my ‘67 Duetto from which the replacements were machined are M8 1.25 mm pitch!

Seems like at some point the pitch was changed either from or to 1.00mm ??
Saluti
Nick

2BEE21AB-321C-404A-A281-1309A6457500.jpeg
 

·
Registered
Joined
·
192 Posts
Discussion Starter #18
Interesting. I think mine might have been 1.25 per mm also. Someone had forced a coarse thread bolt in at some point as a replacement, so I used a bolt with 1.0 threads per mm to check the threading; of course it didn’t go in smoothly as the threads were damaged from that coarse thread bolt being forced in But I assumed the correct threading to be 1.0 per mm (as that is the common pitch available for 8mm bolts); So, I ran a 1.0 per mm tap through the trunnion thinking I was cleaning up the threads. I most likely just changed the threading incorrectly. I had better just stick with what I have, as changing the threads in the trunnions again will likely destroy them.
thanks for clearing that up for me and for offering to help.
regards
Mark
 
1 - 19 of 19 Posts
Top