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ironbuttjohn 01-09-2020 01:38 AM

torque for master cylinder bolt
 

What is the amount of torque used on the bolt on the back to the '48 master cylinder? This is the one that holds the brake lines on.

51 MERC-CT 01-09-2020 05:49 AM

Re: torque for master cylinder bolt
 

Have never seen a torque value for it.

Mart 01-09-2020 06:09 AM

Re: torque for master cylinder bolt
 

I believe he's talking about the 1/2" threaded banjo bolt that holds the brass distribution block on the back of the cylinder. I don't know the torque. I just use a suitable sized spanner (wrench) and make sure it is tight.

Sometimes you need to use judgement and develop a feel.

Mart.

richard crow 01-09-2020 09:36 AM

Re: torque for master cylinder bolt
 

if your using dot 5 use new brass washers & tighten as tight as a craps ass

fordv8j 01-09-2020 10:21 AM

Re: torque for master cylinder bolt
 

Quote:

Originally Posted by richard crow (Post 1839504)
if your using dot 5 use new brass washers & tighten as tight as a craps ass

be careful, I twisted one off...make sure you have the copper washers on both sides of fitting

19Fordy 01-09-2020 10:28 AM

Re: torque for master cylinder bolt
 

No specified torque. Just tighten it up enough to seat and seal in the copper washers.

rotorwrench 01-09-2020 10:36 AM

Re: torque for master cylinder bolt
 

If copper washers are new, they should be annealed soft. If they are old, they need to be annealed. It's best to use new but you can heat them up red hot and quench them in water to anneal them. It doesn't take much torque to get a seal. Hollow banjo bolts break easily so snug them good and see if they leak. Tighten until they don't leak within good reason. That's about the best I can say.

Frank Miller 01-10-2020 08:47 AM

Re: torque for master cylinder bolt
 

The other thing that is easy to break is the brass fitting when screwing in the brake light switch. I had a hell of a time sealing the one on my 49. Never thought to anneal them first.

Newc 01-11-2020 02:01 AM

Re: torque for master cylinder bolt
 

Rotorwrench has it down. Aircraft spark plugs use copper washers, and we kept a supply of annealed ones for each job. Trainees got to do it. Newc

glennpm 01-11-2020 07:13 AM

Re: torque for master cylinder bolt
 

For annealing copper, rub some hand soap on the washer. Heat it up and when the soap blackens or turns to soot, you have the right temperature. Copper can either be air on water/oil quenched and with keep the anneal, softness, either way. Water quench will remove the black oxide.

PeteVS 01-11-2020 09:40 PM

Re: torque for master cylinder bolt
 

Quote:

Originally Posted by glennpm (Post 1840136)
For annealing copper, rub some hand soap on the washer. Heat it up and when the soap blackens or turns to soot, you have the right temperature. Copper can either be air on water/oil quenched and with keep the anneal, softness, either way. Water quench will remove the black oxide.

Thanks! I was just going to ask!

ironbuttjohn 01-12-2020 07:58 AM

Re: torque for master cylinder bolt
 

Thanks to everyone for the comments. I have broken this bolt in the pass on another project, real pain in the butt.

Mart 01-12-2020 09:36 AM

Re: torque for master cylinder bolt
 

Well, the torque is a bit less than what you used last time then.

Sorry couldn't resist.

Mart.

PeteVS 01-18-2020 03:44 PM

Re: torque for master cylinder bolt
 

Here's a link to how to anneal copper...
https://www.wikihow.com/Anneal-Copper

Kube 01-18-2020 06:57 PM

Re: torque for master cylinder bolt
 

Quote:

Originally Posted by Mart (Post 1840483)
Well, the torque is a bit less than what you used last time then.

Sorry couldn't resist.

Mart.

Great observation and funny!


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