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TR2/3/3A TR3 throttle linkage bell crank.

DavidApp

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During the restoration of my TR3A I found that there was a lot of wear in the throttle linkage at the bell crank mounted on the manifold. My parts kit car came with 2 bell crank link assemblies both worn.
I ordered both the bell crank and pivot for the bell crank from one of the normal parts houses. When it arrived there were several issues with it.
First the holes where the link rod assemblies screw in were not threaded. They were just pilot holes.
Second the bell crank has unequal legs so if the boss is welded on the wrong side the bell crank does not fit.
Third the pivot was not for a TR3A, Maybe for a TR2 but not the TR3A
When I contacted the supplier I was told the holes are done that way so you can thread to suit your application. When I asked about the other problems I was told that they were always like that.
So I managed to make a workable unit from my 2 assemblies and a washer to take up some slop.

I have now got a 3 in 1 Lathe/Mill/Drill so I made my own Bell crank and pivot. I had thought about adding an oilite bush to make it last longer.
Going to put it on the car next week.

David
bell crank assembly 2.jpg
bell crank assembly.jpg
 

Madflyer

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GREAT JOB I need to do the same with my TR 6 not so much tooling I may be able to oversize and add bushing. I will post my fix
 

CJD

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Very Nice! Even having the minimal ability to machine simple parts comes in really handy.
 
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DavidApp

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I have added a brass washer between the bell crank and pivot.

Anyone else had the issue that the pivot bracket supplied looks like the drawing in the Moss catalogue and does not fit the TR3 manifold?

David
 

Sarastro

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Looks nice. I also have some simple machine tools, a Sherline mill and lathe. They have been really useful.

I also found the bellcrank in my TR4A to be pretty worn. I was able to fix it with a little machining, improving the throttle control.
 
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DavidApp

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The one on the right is correct for my TR3A and the one on the left is what I got from the supplier who said that is all they sell.

David
pivot brackets.jpg
 
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DavidApp

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Either there is another source of the correct pivot or people are fixing/ living with the worn pivot.

David
 
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DavidApp

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I installed my home made bell crank assembly a few days ago and it is a great improvement on the one I made to work with washers to take up the slop.
While I had the carbs off the engine I decided to fix the leaking float bowl grommets on the front carb. I had ordered new grommets from TRF. Put them on and found it still leaks.
I removed the carbs again and checked that I had grommets centered on the float bowl neck and reassembled it again.
Still leaks.

Any ideas on what I am missing.

David
 
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