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View Full Version : TR2/3/3A TR3 Throttle linkage pics needed



newmexTR3
07-12-2013, 02:59 PM
Hey all,

Long time no talk. Just finished up 3 months of work on the TR: reupholstered dash, added wood veneer to instrument cluster, installed new wiring harness, installed uprated heater (https://www.revingtontr.com/shop/product_display.asp?mscssid=0CJEF1N30H9V9LX2H07J30 SNLS6M0C33&CarType=TR3&ProductID=RTR1395K), fixed throttle linkage bushings, etc etc... It was one of those, "might as well fix that bit since i'm doing this bit" jobs that snowballed, but I'm happy with the results. Got her back on the road just in time to drive from Brooklyn to Cape Cod for the holiday. Also sprung for the ferry ride out to Martha's Vineyard, which had great driving. Pics coming soon!

With everything back together I have a new weird problem- the throttle linkage is binding somewhere between the firewall and the front carb once the car warms up (at least that's where i think it is. When it's hot, the linkage wants to stay open about 10%. Interestingly, it's worse when I put it in reverse, which makes no sense to me.

While cold, the linkage returns to its proper place easily. All ball joints are new and lubricated and return spring is new, and I installed brand new nylon bushings on both sides of the linkage rod that runs behind and perpendicular to the engine, so I'm somewhat mystified. I have a feeling the geometry may be slightly off- ie the lengths of the two link rods may not be set correctly. So, does anyone have measurements of the long and short link rods and/or pics of their linkage that they could share? I'm particularly interested in the angles of the throttle lever that attaches to the throttle shaft and the lever assembly that attaches to the pedal shaft- I have no idea what stock looks like.

Here's two pics that hopefully illustrate what I'm talking about. Cheers in advance.

28086
28085

mrv8q
07-12-2013, 03:20 PM
Here's one I have handy, HTH
https://i125.photobucket.com/albums/p52/mrv8q/IMG_1419.jpg[/URL]

newmexTR3
07-12-2013, 03:33 PM
Nice. Thanks Kevin!

TR3driver
07-12-2013, 05:45 PM
Just a thought, since you didn't mention it. I found that wear in the bell crank pivot was letting the crank drag against the bolt head that holds the bracket to the intake manifold. You can see in Kevin's photo how the crank almost touches the bolt head anyway.

newmexTR3
07-13-2013, 11:04 AM
Thanks Randall.

A question- how loose is the bell crank pivot supposed to be? I know there is supposed to be some play, but mine seems to have a ton. I think that may be the issue. It's not binding on the bolt head, but it does seem to be getting hung up on the shaft itself, probably because it's so worn.

Anyone else have a few more pics?

newmexTR3
07-15-2013, 10:10 AM
Giving this a bump. Any pics would be appreciated. Thanks.

CJD
07-16-2013, 08:12 AM
Sorry, I don't have any pics, but my bellcrank has almost no play.

TR3driver
07-16-2013, 09:45 AM
Thanks Randall.

A question- how loose is the bell crank pivot supposed to be? I know there is supposed to be some play, but mine seems to have a ton. I think that may be the issue. It's not binding on the bolt head, but it does seem to be getting hung up on the shaft itself, probably because it's so worn.
I think it should have almost no side to side play, just loose enough to turn freely.
They don't seem to be available new, but I was able to file the pivot back to some semblance of round and use a piece of thinwall brass tubing to sleeve the lever to fit. Also filed a bit off the head of the bolt :)

But I'm still having some trouble in that area myself, so I can't really claim it's right yet. Just haven't taken time to revisit the subject.

newmexTR3
07-16-2013, 10:25 AM
Thanks Randall & John- that must be the issue. Mine has a ton of play.I wonder if Mr. Joe Curto (https://joecurto.com/) has some replacement bits laying around.

martx-5
07-16-2013, 11:47 AM
Hey Gavin, good to see you come out of hiding.

Joe might be a source. You could just drop in, he's right around the corner from you.

I had a similar problem with a sloppy bell crank. I fortunately had a good spare on a manifold that I bought off ebay.