View Full Version : Well the Big Day arrived. Let the questions begin

11-04-2012, 10:00 AM
My TR3 was delivered last night. (Kudos to Magic Carpet Transporters). I'll apologize in advance for all the questions I know I'm going to ask. I consider myself a pretty decent mechanic and I'm armed with good manuals, but there's nothing like advice from those who have "been there".
Let's start with an easy one: When I pulled the scuttle vent knob, it came right out of the dash. Can't find a break down on the linkage anywhere. Any help?

11-04-2012, 10:22 AM
Exciting isn't it? Congrats!

Here's an old link that might help in terms of pictures:
bcf vent discussion (https://www.britishcarforum.com/bcforum/ubbthreads.php/ubb/showflat/Number/773231/Searchpage/1/Main/78672/Words/%2Bscuttle+%2Bvent/Search/true/Re_TR3A_vent_Linkage#Post773231)

11-04-2012, 10:27 AM
Congrats on the new arrival! You'll never get bored now ... :jester:

Here's another link to a recent discussion on how that vent linkage all fits together, pictures included.


Keep up the questions!


11-04-2012, 11:24 AM
When I pulled the scuttle vent knob, it came right out of the dash.
How much came out with the knob? The knob fits over a hexagonal piece, which has a button to engage the hole in the knob. The hex piece is permanently fastened (solder IIRC) to a thin rod that runs through the scuttle (and a grommet) out to the linkage under the vent, where it gets clamped by a small hex head screw into a round piece that is supposed to pivot as the mechanism moves (so the rod doesn't bend).

Mine broke next to the clamp. Since at the time I didn't know where to buy a replacement, I made my own from a bicycle spoke, a hex standoff and a small set screw.

11-04-2012, 04:51 PM
Bingo... you've been there. The hex piece stayed in the knob and pulled off of the thin rod.
I'm not convinced that it's soldered to the rod. I see a small "ramped" slot milled in the end of the hex piece. Like it may slide over some kind of a catch?
I guess I'll tear into later. Right now I just want to drive and get to know the car.

11-04-2012, 06:08 PM
Makes sense to me. I've never been able to tell that the vent does much anyway.

11-04-2012, 06:39 PM
Guys, thanks for the links.
Here's the push/pull rod that attaches to the knob.
The knob is locked onto the little white metal hex piece with a "spring pin" that allows easy removal.
The hex piece appears to be press fit or shrunk onto a 3" section of brass rod (approx 3/16" dia). This rod has a slot milled down it's length that I assume lines up with a pin that keeps it from rotating. I haven't gone into the dash to find this pin.
The brass rod then has a piece of 1/16" rigid wire attached to it (soldered?)
Finally this wire rod attaches to the lever that raises or lowers the vent.
My problem is: The hex piece pulled off the brass piece. Think I'll try super glue for the fix.

11-04-2012, 07:18 PM
My opinion, you're looking at a previous repair. Good luck with the superglue.

11-04-2012, 07:50 PM
My opinion, you're looking at a previous repair. Good luck with the superglue.

Yes, the rod should be one piece. Good luck with gluing - there is a lot of stress on that joint - it's a straight on pull - I wouldn't chance it - it's too fiddly a piece to re-do... I suggest you just buy a new piece. TRF part number 112019. They sometimes go on sale for +- 15 bucks - I see they've gone up a bit...


Best schematic of how it all goes together is from Don Elliott - check part way down in an old posting I did asking the same question a while ago...


11-04-2012, 10:18 PM
Congratulations on your new arrival.