……
Corvair DiagramCorvair Photo
Corvair Center
home forum corvairs calendar links Corvair Podcast
California Corvairs
Clarks Corvair
Clarks Corvair
“CORSA"



Chevy Corvair License Plate
Chevy Corvair Chrome Wheel
Corvair Center Forum :  Corvair Center Phorum - presented by CORSA The fastest message board... ever.
Corvair Center 
Tricks for removing old wheel cylinder bolts?
Posted by: statue4 ()
Date: August 18, 2022 11:30AM

I have a Corvair again cool smiley
I'm in the process of getting it roadworthy, part of which includes brakes. I'm having a real hard time removing the bolts that hold on the wheel cylinder(s). So far I've only tried the rear, right one. I remember this giving me trouble on my last Corvair, but I don't remember what tricks I used. Also, the last car was a SoCal car and this one is a Chicago/Wisconsin car (RUST). Seems like a 3/8" bolt head and I've tried hammering a smaller sized wrench on (11/32" and 9mm) but it just rounds the head. There's not enough room to fit a grinder in. I'd really like to avoid having to remove the whole assembly if possible. Thanks!

Also, if it matters, this is a late-model car

Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: jazzworkerbee ()
Date: August 18, 2022 11:36AM

I posted the same question a while back and got some fantastic advice. This wrench worked for me.

Daniel Atkinson
Tacoma, WA
65 Turbocharged Corsa

Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: RexJohnson ()
Date: August 18, 2022 11:59AM

You can remove the 4 nuts that hold the backing plate on. You can now move the plate outward to get more room. The same nuts hold on the bearing assy but you can get a lot of extra room without pulling out the bearing assy.

RJ tools
Salem,Oregon

Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: 110PG ()
Date: August 18, 2022 12:12PM

This sounds harsh but if I'm replacing them (Wisconsin), I just hit the cylinder with a good hammer and they break away in quick work. If you aren't careful (which I guess this isnt) You may need to hammer/dolly the backing plate a little.

Joe
Western WI

66 Corsa Turbo CPE
69 Monza CPE (sons car)

Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: junkman ()
Date: August 19, 2022 06:20AM

Without using brute force, you can remove them if you can put some heat onto the bolt heads. I have a small handheld torch that I use for close quarters. Get them very hot, and then use a good quality 6-point box wrench to back them out. I usually worked them on and off a few times as I back them out. This keeps any rust from building up in the threads and jamming up the bolt. Just take your time, and you should be able to get them off and hone them for rebuilding. OEM parts are superior to any off shore made parts.

---------------------------------------------------------------------------------------------------------------
Woodstock CT... Located on the Connecticut / Massachusetts border, approximately 6 miles from the center of Southbridge MA. About 45 minutes from Hartford CT. 1 1/2 hours West of Boston MA. Woodstock CT to Los Angeles CA 2,937.1 miles. 1 Mile as the crow flies to Big Bird's nest.

Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: vairmech ()
Date: August 19, 2022 04:31PM

Are you changing the wheel cylinder? If so use a chisel and just break the heads off. Get ne bolts.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: jjohnsonjo ()
Date: August 19, 2022 04:48PM

I used a dremel with off discs

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: Phil Dally ()
Date: August 19, 2022 06:00PM

I vote for the BFH technique.

Attachments:
Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: statue4 ()
Date: August 25, 2022 12:22PM

I've taken a break from that rear right one and moved on for now. The front ones were little trouble. One required me to use a torch; the other just came off easy. They also looked like they had been replaced more recently. Now I'm to the rear left and it is just a stuck as rear right. Heat didn't do the trick, so I'm going to try a chisel or Dremel next.

While I'm at it with the car jacked up I'll install new heater duct hoses.
Really looking forward to getting this Corvair on the road!

Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: statue4 ()
Date: August 30, 2022 06:46PM

Thanks for the tips everybody. What eventually did get the rear wheel cylinders off was the torch and, of course, the BFH.

Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: Phil Dally ()
Date: August 31, 2022 03:40AM

HOT WRENCH and BFH RULE!!!

Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: Lane66m ()
Date: August 31, 2022 04:13AM

Left ftont, Get speeometer cable mount out of the way for more room.

First 1/4 drive ratchet and 6 point socket. Twist them until they break. If the dont come loose, you will end up stripping heads. The deep box end wrench is useful, if a 6 point. If it is 12, you will strip the bolt heads immediately.

Theh try the stripped head socket and rachet tools.

Final act, either small chisel and hammer or Dremel tool and grinder wheel.

Good luck. Last 6 years, I had to do 9 LM cars (2 drivers and 7 to scrap) and all needed one of the above processes .

Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: KenHenry ()
Date: August 31, 2022 04:48AM

Have you posted photos of your car? We would all love to see it

Ken Henry, Rochester, NY USA
1965 Corvair Corsa
140 hp, 4 speed

Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: JimBrandberg ()
Date: August 31, 2022 04:58AM

I haven't been able to find a source for new 1/4-20 bolts with flange and 3/8 hex head. I don't like using regular bolts with 7/16 hex head as the smaller socket or wrench is easier to get in there. My usual source flangebolts.com doesn' t have anything that short. I think they're 3/8 in length if I remember right. I've got a few used ones so it hasn't been a pressing search.

Jim Brandberg
Isanti, MN
CorvairRepair.com



Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: Lane66m ()
Date: August 31, 2022 05:00AM

I saved what I could from the scrapped cars. Weren't that many. About 8 out of 28, I believe.

But I remember LMs were star-washered hex head 1/4-20 x 3/8.



Edited 1 time(s). Last edit at 08/31/2022 05:03AM by Lane66m.

Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: Phil Dally ()
Date: August 31, 2022 06:51AM

A substitute is same size bolts that hold down the top should work.

They are serrated and at least they are a genuine Corvair part. cool smiley


[ssl.corvair.com]

Attachments:
Options: ReplyQuote
Re: Tricks for removing old wheel cylinder bolts?
Posted by: Frank DuVal ()
Date: August 31, 2022 08:25PM

Quote
Jim
. My usual source flangebolts.com doesn't have anything that short.

Hacksaw, grinder, porta-band, Dremel tool, "muffler cutter" aka body shop tool with the 3" discs.winking smiley A mill if one is handy... Ha! Or a lathe.

Frank DuVal

Fredericksburg, VA

Options: ReplyQuote


Sorry, only registered users may post in this forum.
This forum powered by Phorum.