The Ford Barn

ironbuttjohn · 01-09-2020, 01:38 AM

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

Have never seen a torque value for it.

Mart · 01-09-2020, 06:09 AM

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

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

fordv8j · 01-09-2020, 10:21 AM

Quote:

Originally Posted by richard crow

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

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

rotorwrench · 01-09-2020, 10:36 AM

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.

zuburg · 07-07-2021, 05:26 PM

So are you saying new copper washers from the parts store such as from Dorman that are described for brake lines need annealing? I thought they would be ready to use since they were described for brake lines?

51 MERC-CT · 07-07-2021, 06:30 PM

Quote:

Originally Posted by zuburg

So are you saying new copper washers from the parts store such as from Dorman that are described for brake lines need annealing? I thought they would be ready to use since they were described for brake lines?

Only used washers should be annealed in order to re-use.

Ross F-1 · 07-08-2021, 08:43 PM

Quote:

Originally Posted by 51 MERC-CT

Only used washers should be annealed in order to re-use.

Depends. I get my washers at NAPA and they are hard as rock. Not sure if they are Dorman or what.

Got to watch out too, our chinese brothers are putting out copper-coated washers, not clear what's underneath.

FlatheadTed · 08-04-2021, 05:44 PM

Zuburg ,Leaks at the M/C rear
Inspect the matting face often the casting is not machined well a smooth face is necessary around the thread and Then you have a better chance for the washers to seal ,The one we had a continued problem with we removed the M/C and re faced the rough cast end to clean it up , over tightening can distort/crush the block, it should have a washer as has been said on the M/C side , Ted

Frank Miller · 01-10-2020, 08:47 AM

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

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

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

Quote:

Originally Posted by glennpm

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

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

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

Sorry couldn't resist.

Mart.

Kube · 01-18-2020, 06:57 PM

Quote:

Originally Posted by Mart

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

Sorry couldn't resist.

Mart.

Great observation and funny!

PeteVS · 01-18-2020, 03:44 PM

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

JSeery · 07-08-2021, 11:19 PM

The idea is to soften the copper so it will seal, new or used, they need to be soft.

01-09-2020, 01:38 AM	#1
ironbuttjohn Member Join Date: May 2010 Location: North Carolina Posts: 71	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.

01-09-2020, 05:49 AM	#2
51 MERC-CT Senior Member Join Date: May 2010 Location: East Hartford, Ct Posts: 5,898	Re: torque for master cylinder bolt Have never seen a torque value for it. __________________ DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES Last edited by 51 MERC-CT; 01-09-2020 at 06:15 AM.

01-09-2020, 06:09 AM	#3
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 8,743	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.

01-09-2020, 09:36 AM	#4
richard crow Senior Member Join Date: May 2010 Posts: 1,767	Re: torque for master cylinder bolt if your using dot 5 use new brass washers & tighten as tight as a craps ass

01-09-2020, 10:28 AM	#6
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,920	Re: torque for master cylinder bolt Sponsored Links (Register now to hide all advertisements) No specified torque. Just tighten it up enough to seat and seal in the copper washers.

01-09-2020, 10:36 AM	#7
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,419	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.

07-07-2021, 05:26 PM	#8
zuburg Senior Member Join Date: Jun 2015 Location: Raleigh, NC Posts: 332	Re: torque for master cylinder bolt So are you saying new copper washers from the parts store such as from Dorman that are described for brake lines need annealing? I thought they would be ready to use since they were described for brake lines?

08-04-2021, 05:44 PM	#11
FlatheadTed Senior Member Join Date: May 2010 Location: Auckland Posts: 4,700	Re: torque for master cylinder bolt Zuburg ,Leaks at the M/C rear Inspect the matting face often the casting is not machined well a smooth face is necessary around the thread and Then you have a better chance for the washers to seal ,The one we had a continued problem with we removed the M/C and re faced the rough cast end to clean it up , over tightening can distort/crush the block, it should have a washer as has been said on the M/C side , Ted __________________ http://www.flatheadted.com Flathead Ted brake Floaters , Last edited by FlatheadTed; 08-05-2021 at 03:23 AM.

01-10-2020, 08:47 AM	#12
Frank Miller Senior Member Join Date: May 2010 Location: Auburn, MA Posts: 2,106	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. __________________ “The technique of infamy is to start two lies at once and get people arguing heatedly over which is true.” ~ Ezra Pound

01-11-2020, 02:01 AM	#13
Newc Senior Member Join Date: May 2010 Posts: 2,480	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

01-11-2020, 07:13 AM	#14
glennpm Senior Member Join Date: Sep 2014 Location: Wiscasset, Maine Posts: 1,980	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.

01-12-2020, 07:58 AM	#16
ironbuttjohn Member Join Date: May 2010 Location: North Carolina Posts: 71	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.

01-12-2020, 09:36 AM	#17
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 8,743	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.

01-18-2020, 03:44 PM	#19
PeteVS Senior Member Join Date: May 2010 Location: FP, NJ Posts: 2,770	Re: torque for master cylinder bolt Here's a link to how to anneal copper... https://www.wikihow.com/Anneal-Copper __________________ Don't never get rid of nuthin!

07-08-2021, 11:19 PM	#20
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: torque for master cylinder bolt The idea is to soften the copper so it will seal, new or used, they need to be soft.

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