BUSY BOLTERS Are you one?  The Shop Area
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Jul 21st, 2025 | | | | Joined: May 2015 Posts: 11 'Bolter | | 'Bolter Joined: May 2015 Posts: 11 | I am going to disc front brakes three of the bolts holding the backing plate on came off easy the fourth in the lower front will not move the nut is off any ideas. Already tried lots of pb blaster and hammer I do not have a torch. Thanks | | | | | Joined: May 2015 Posts: 9,830 Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums | | Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums Joined: May 2015 Posts: 9,830 | I would go down to your local hardware and buy a propane torch. It would work fine for heating the area to break that bolt free.
From your description, I assume it's rusted into the hole thru the spindle. A little bit of heat around the hole will help release it - it doesn't need to get red hot. If you can access the head of the bolt with a socket, use a breaker bar and start working it back and forth. Avoid hammering on the threaded end of the bolt or you'll mushroom it and you'll then need to cut the mushroomed end off. The largest hammer you can find is the best thing to use. Hitting it with dinky hammer is more likely to damage things.
Heat, PB, hammer, and repeat as necessary. It'll eventually come out.
Kevin 1951 Chevy 3100 work truckFollow this saga in Project JournalPhotos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together. | | | | | Joined: Feb 2016 Posts: 1,841 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,841 | Heat is magic, you can also get a MAPP gas hand torch which will heat it faster than propane.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | MAPP gas comes in Yellow cylinders.
Ed
Last edited by EdPruss; 01/28/2025 4:04 PM.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: May 2015 Posts: 9,830 Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums | | Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums Joined: May 2015 Posts: 9,830 | They say MAPP gas can't be used in some propane torches, but I've done that and haven't blown up. 
Kevin 1951 Chevy 3100 work truckFollow this saga in Project JournalPhotos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together. | | | | | Joined: May 2015 Posts: 11 'Bolter | | 'Bolter Joined: May 2015 Posts: 11 | | | | | | Joined: Feb 2016 Posts: 1,841 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,841 | I think the MAPP torch tip can better withstand the higher heat than the propane tip. I know when I used a TurboTorch with acetylene it didn't like being throttled down, the tip would be bright red unless you turned the torch up all the way, it has to pull in enough air to help cool the tip. I think the MAPP tips are designed to do that.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| | | | | Joined: May 2015 Posts: 11 'Bolter | | 'Bolter Joined: May 2015 Posts: 11 | Got it out thanks again for the help | | |
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