Straightening a 36B Top....

Posted by: 57-Chevy

Straightening a 36B Top.... - Thu Sep 07 2017 08:50 PM

I picked up another Tokheim 36B a few months back. It was leaning over and a tree had grown into the top. It pretty much looked like a lost cause and was bent inward and downward.

This is the second 36B top that I have straightened. I thought I would take a few pics. and share here on oldgas. I hope this will help and encourage someone else to try and save their top. They can be straightened with heat, pressure, and a lot of patience!

1) Build a heavy duty steel support jig.
2) Have lots of clamps, angle, channel, flat bar, etc. on hand
3) Slowly heat the pot metal top. (I used a Reddy Heater)
4) Slowly apply pressure with each carefully placed clamp a little at a time. Don't go too fast. I would move the bent section a little and place back in front of the heat. I was heating it hot enough that it would almost burn you with gloves on. A lot of the car guys say you can work pot metal at about 300 degrees or so.
5) Once straightened, turn off heat and let it cool on its own. I didn't take the jigs or clamps off until a couple days later. The end result speaks for itself, perfect top again! And NO cracks!

Before:



Posted by: 57-Chevy

Re: Straightening a 36B Top.... - Thu Sep 07 2017 08:52 PM

During:
Posted by: petropumps

Re: Straightening a 36B Top.... - Thu Sep 07 2017 09:00 PM

That's amazing. Had no idea you could do that with pot metal.
Posted by: Craig Osbeck

Re: Straightening a 36B Top.... - Thu Sep 07 2017 09:38 PM

Good job
Posted by: Speedracer

Re: Straightening a 36B Top.... - Thu Sep 07 2017 09:54 PM

Very, very nice job. Good save.
Posted by: RandyM

Re: Straightening a 36B Top.... - Fri Sep 08 2017 06:34 AM

NOW! That is a great post. Thank you for sharing.
Posted by: shavron

Re: Straightening a 36B Top.... - Fri Sep 08 2017 08:15 AM

Thank you for posting that. I'm a newbie
Posted by: 57-Chevy

Re: Straightening a 36B Top.... - Fri Sep 08 2017 08:37 AM

Ron, that one can be straightened! Just remember patience!
Posted by: tulareone

Re: Straightening a 36B Top.... - Fri Sep 08 2017 10:15 PM

Can I just send you mine -- what you charge-- ruben
Posted by: BrianH

Re: Straightening a 36B Top.... - Sat Sep 09 2017 06:10 PM

That is nice work. Good job on straightening out the original part without cracking it!

BrianH
Posted by: shavron

Re: Straightening a 36B Top.... - Sun Sep 10 2017 02:56 PM

I haven't got mine apart, but it should fit into an oven and set it to 300 deg.
Posted by: Done4

Re: Straightening a 36B Top.... - Sun Sep 10 2017 03:46 PM

Did you get flight control approval on the oven thing? The
Posted by: shavron

Re: Straightening a 36B Top.... - Sun Sep 10 2017 05:53 PM

We'll see, I'll keep you posted.