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Cj2A master brake cylinder |
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Thing 2 
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Joined: 27 Jan. 2017 Location: Greenville SC Status: Offline Points: 24 |
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 Topic: Cj2A master brake cylinderPosted: 10 June 2018 at 6:51pm |
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my 46 CJ2A needs a new master cylinder. If I give you the VIN number ( 63563 ) can you tell me which one to order. Two choices are: #1 front mounting hole is threaded. Or #2 both front mounting holes are not threaded, goes straight through.
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ndnchf
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Posted: 10 June 2018 at 7:24pm |
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According to Walck's its this one:
But why don't you just look and see what is on it now? That would eliminate any guess work. No telling what has been changed over the last 72 years.
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1948 CJ2A - It goes nowhere fast, but anywhere slow.
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Thing 2
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Joined: 27 Jan. 2017 Location: Greenville SC Status: Offline Points: 24 |
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Posted: 13 June 2018 at 8:39pm |
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I found out that you can determine which kind of master cylinder you have by measuring the bolt distance c/c. If it’s 3.25” your master is the “ front mounting hole is threaded “ variant. The other variety is straight through and wider c/c than 3.25”. Now, I still have to drive 155 miles to inspect the thing.
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Ol' Unreliable
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Joined: 25 Sep. 2016 Location: CO Springs CO Status: Online Points: 2454 |
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Posted: 13 June 2018 at 9:15pm |
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That's some useful info. Thanks!
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There's a reason it's called Ol' Unreliable
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Bruce W
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Joined: 29 July 2005 Location: Northeast Colorado Status: Offline Points: 5453 |
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Posted: 13 June 2018 at 11:29pm |
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Do they break it down into "early" vs "late"? If so, I'm sure you need the early one, I don't think that was changed until the frame was changed in '49. Or you can check and see what the CJ3A/B call for. I'd bet that they use the same as the "late" CJ2-A. You would need the other one. BW
Edit: I just checked the parts manual. The "early" master cylinder is part # A-556, and is used thru serial number 215649. Part # 647558 is used on "late" CJ2-A's after serial number 215649, and all CJ3A's. An aluminum master is mentioned for the later models, which I've never seen. If you would like, I can measure the bolt center distance on one of my '47s tomorrow. BW
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Happy Trails! Good-bye, Good Luck, and May the Good Lord Take a Likin' to You!
We Have Miles to Jeep, Before We Sleep. |
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WeeWilly
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Posted: 14 June 2018 at 9:07am |
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The master cyl. bodies are also different in shape between the early and late. The early has a round tube like shape to the reservoir while the late has more of a square shape to it.
Jim
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47 CJ2A (Ranch Hand) 48 CJ2A, 48 Willys truck, T3C 3782, M274 (Military Mule)
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tufcj2a
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Joined: 19 Apr. 2018 Location: California Status: Offline Points: 131 |
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Posted: 14 June 2018 at 8:14pm |
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Yes, I just replaced my MC, very easy to tell the difference. Just take a look at the frame and you can usually tell immediately. One version bolts through the frame, the other bolts into it.
otherwiseee measure from bolt to bolt.
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SnorriS
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Joined: 21 June 2018 Location: Grand Junction Status: Offline Points: 3 |
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Posted: 21 June 2018 at 3:53pm |
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How much pitting in a master cylinder is salvageable with hone?
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48 in process
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ndnchf
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Posted: 21 June 2018 at 4:16pm |
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Not much. A good rule of thumb is if you can feel the pit with a fingernail, it's too deep. New master cylinders are pretty cheap. For all the effort of trying to hone it and then it may or may not work, I'd just get a new one.
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1948 CJ2A - It goes nowhere fast, but anywhere slow.
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SnorriS
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Joined: 21 June 2018 Location: Grand Junction Status: Offline Points: 3 |
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Posted: 21 June 2018 at 9:03pm |
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tThat was my thought as well.
Thanks for the opinion.
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48 in process
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Ol' Unreliable
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Posted: 21 June 2018 at 10:28pm |
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How much does it cost to have a master cylinder sleeved?
BTW, welcome to the page, SnorriS! |
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There's a reason it's called Ol' Unreliable
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cpt logger
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Posted: 21 June 2018 at 10:46pm |
The last time I looked into this, the sleeve repair cost almost three times what a new master cylinder cost. Of course, YMMV.
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Ol' Unreliable
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Posted: 21 June 2018 at 11:00pm |
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I guess sleeving is for the restoration purist. The ones with m-o-n-e-y.
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There's a reason it's called Ol' Unreliable
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wadoyado
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Posted: 21 June 2018 at 11:20pm |
 Don't mean to hi-jack your thread Thing 2 but you might find this of interest. I bought this (advertised as NOS Cj2a MC repair kit). The piston measured 1 1/16" dia. Thinking I needed to ream the MC to size, I brought it to my cuz's die shop. In the process this steel sleeve came out like it was meant to be removed for the oversized repair kit. The surface was shiny smooth so I installed the oversized kit and kept my fingers crossed. Brakes work(1mi on the road) and don't appear to leak. Anyone else ever encounter this? Joe W
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"It's unbelievable how much you don't know about the jeep you've been driving all your life" (Mickey Mantle paraphrase)
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SnorriS
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Posted: 25 June 2018 at 7:42pm |
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Thanks for the welcome.
As a follow up, I bought a little brake cylinder hone. Small amount of old caked on material came out easily and left the MC in good shape. A little history on my '48. It was well cared for by the previous owner. He passed away in the mid '80's and it has sat since then. Brake fluid dries out. Gas dried out. New oil in engine and oil bath air cleaner and she turns over by hand easily. So just some system cleaning and brake cylinders cleaned out and rebuilt and I expect it will be rolling to new adventures soon. Hope to make some friends here as I have questions or post some sucsessful til I learn along the way. -S
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48 in process
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Ol' Unreliable wrote: