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Mapp gas to heat up bearing race? #3242422
07/04/24 05:43 PM
07/04/24 05:43 PM
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I have an inner bearing race stuck tight on the spindle on my 69 Dart..I bought a yellow bottle of Mapp gas in an attempt to heat it enough so can pull it off with channel locks..I am not having much success and my grandson tells me there is a special head to use with Mapp gas instead of a propane head like I tried to use. Suggestions please? Thanks! Ted wave


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Re: Mapp gas to heat up bearing race? [Re: tboomer] #3242435
07/04/24 07:00 PM
07/04/24 07:00 PM
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Eagle, Idaho
Neil Offline
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How about this method instead of the heat?

https://youtube.com/shorts/O6elvEziNhk?si=7kV061Pr5-3yiV02

Re: Mapp gas to heat up bearing race? [Re: Neil] #3242438
07/04/24 07:09 PM
07/04/24 07:09 PM
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Do you have a welder there? You can also heat the race with that. OR can you cut a couple small grooves in it with a drem tool and small cutoff wheel and then whack it with a chisel as it will snap apart. Umm air compressor and die grinder with a small cutter?


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Re: Mapp gas to heat up bearing race? [Re: Mr PotatoHead] #3242443
07/04/24 07:25 PM
07/04/24 07:25 PM
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i would support the spindle with something, then use a SHARP chisel and hit the race in 180* offsets. then 90* to the earlier 2 if needed. .
the race should shatter and almost fall off after the first 2 impacts 80% of the time. i do this with rear 8 3/4 axles bearing retainers all of the time.


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Re: Mapp gas to heat up bearing race? [Re: Mr T2U] #3242445
07/04/24 07:46 PM
07/04/24 07:46 PM
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Thanks guys...It's still on the car yet...I do have a small welder here at home and a die grinder. The dremel is a rechargeable but pretty weak. The smallest disc for the die grinder that I can find locally id 3"..


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Re: Mapp gas to heat up bearing race? [Re: tboomer] #3242447
07/04/24 08:22 PM
07/04/24 08:22 PM
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I didn't change the head when I went from propane to MAAP. Maybe I should have but the flame visually looks good so..........

Just throwing this out there, if it was me I'd weld two pieces of Redi-Rod to the race and use a steering wheel puller to pull it off. Just a thought.

Last edited by 6PakBee; 07/04/24 08:46 PM. Reason: Musing........

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Re: Mapp gas to heat up bearing race? [Re: tboomer] #3242466
07/04/24 09:15 PM
07/04/24 09:15 PM
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Originally Posted by tboomer
Thanks guys...It's still on the car yet...I do have a small welder here at home and a die grinder. The dremel is a rechargeable but pretty weak. The smallest disc for the die grinder that I can find locally id 3"..


Ted I had the same thing happen years ago , I used the dremel thin disc and chisel method.


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Re: Mapp gas to heat up bearing race? [Re: JohnRR] #3242470
07/04/24 09:28 PM
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Thanks John! Amazing what you find after a car sits that long! mad


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Re: Mapp gas to heat up bearing race? [Re: tboomer] #3242472
07/04/24 09:57 PM
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N.E. OHIO, USA
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If you're even slightly good with a cutting torch you can actually cut it off with one. I still cut off inner bearing races with a cutting torch from 2-stroke crankshafts. I was taught this by a mechanic back in the day and he said the (air) gap between the race and the crankshaft spindle will keep it from burning. Just have to be quick and smooth.

Re: Mapp gas to heat up bearing race? [Re: tboomer] #3242482
07/04/24 11:33 PM
07/04/24 11:33 PM
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Originally Posted by tboomer
I have an inner bearing race stuck tight on the spindle on my 69 Dart..I bought a yellow bottle of Mapp gas in an attempt to heat it enough so can pull it off with channel locks..I am not having much success and my grandson tells me there is a special head to use with Mapp gas instead of a propane head like I tried to use. Suggestions please? Thanks! Ted wave





Ted if you have an Oriellys, Auto Zone, Advance Auto or many more you can borrow a puller. Yank that son of a gun off.


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Re: Mapp gas to heat up bearing race? [Re: pittsburghracer] #3242494
07/05/24 05:20 AM
07/05/24 05:20 AM
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Abilene, Texas
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I replace these all the time. Read the service manual. I use a cutoff wheel and then finish it with a chisel. DO NOT UNDER ANY CIRCUMSTANCES USE A TORCH. Want to take a guess how many axles I’ve worked on that I’ve seen a previous torch job on the bearings? Plenty. I’ve made many people very unhappy when I refuse to repair the bearing on axle that I find with torch marks and tell them to bring me another axle. When in doubt, read the service manual.

Re: Mapp gas to heat up bearing race? [Re: fastmark] #3242506
07/05/24 09:23 AM
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I am working on it now...Using an angle grind with a disc...Hope to finish it today! Thanks everyone! up


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Re: Mapp gas to heat up bearing race? [Re: tboomer] #3242508
07/05/24 09:38 AM
07/05/24 09:38 AM
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Use your welder to put down a bead around the outer part of the race. The heat will expand the race, and it will almost fall off.
Works the same on inner races too, will shrink the race and fall out.

Re: Mapp gas to heat up bearing race? [Re: rustbuckett68] #3242527
07/05/24 11:14 AM
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Lol! I can cobble a farm repair but I won't touch this car with a welder! work


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Re: Mapp gas to heat up bearing race? [Re: Mr T2U] #3242543
07/05/24 12:15 PM
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Originally Posted by Mr T2U
i would support the spindle with something, then use a SHARP chisel and hit the race in 180* offsets. then 90* to the earlier 2 if needed. .
the race should shatter and almost fall off after the first 2 impacts 80% of the time. i do this with rear 8 3/4 axles bearing retainers all of the time.


DO NOT USE A CHISEL ON A BEARING RACE! Unless you like very sharp shards of splintered metal shattering in your direction. This is shop safety 101.
You can cut, heat, and use a flay chisel to budge the race down the stem once you've loosened it's grip.

You're MAP gas isn't producing enough heat. I would try an inductive heat gun, if you have access or follow one of the other suggestions.

Re: Mapp gas to heat up bearing race? [Re: Moparteacher] #3242556
07/05/24 12:58 PM
07/05/24 12:58 PM
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Well I didn't have much luck. Gonna have to take the brake back plate off... whiney


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Re: Mapp gas to heat up bearing race? [Re: rustbuckett68] #3242591
07/05/24 05:28 PM
07/05/24 05:28 PM
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Originally Posted by rustbuckett68
Use your welder to put down a bead around the outer part of the race. The heat will expand the race, and it will almost fall off.
Works the same on inner races too, will shrink the race and fall out.


THIS/\


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Re: Mapp gas to heat up bearing race? [Re: Moparteacher] #3242599
07/05/24 07:38 PM
07/05/24 07:38 PM
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Originally Posted by Moparteacher
Originally Posted by Mr T2U
i would support the spindle with something, then use a SHARP chisel and hit the race in 180* offsets. then 90* to the earlier 2 if needed. .
the race should shatter and almost fall off after the first 2 impacts 80% of the time. i do this with rear 8 3/4 axles bearing retainers all of the time.


DO NOT USE A CHISEL ON A BEARING RACE! Unless you like very sharp shards of splintered metal shattering in your direction. This is shop safety 101.
You can cut, heat, and use a flay chisel to budge the race down the stem once you've loosened it's grip.

You're MAP gas isn't producing enough heat. I would try an inductive heat gun, if you have access or follow one of the other suggestions.


When you are on the road and only have a hammer and chisel it works very well! Never had it shatter and spray metal at me, usually a couple hits with the chisel breaks it with no damage to the spindle... shruggy


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Re: Mapp gas to heat up bearing race? [Re: Rhinodart] #3242606
07/05/24 08:13 PM
07/05/24 08:13 PM
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If you use a chisel to split it wrap a rag around the race and it will contain any shrapnel

Re: Mapp gas to heat up bearing race? [Re: stumpy] #3242617
07/05/24 09:56 PM
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I have a sliver of bearing lodged next to the third knuckle in my ring finger. It's been there for 30 years. When it hit I would have bet my paycheck the finger was broken! Serious pain. Doc says it would have done more damage to remove it. Every now and then I'll be doing something and it'll hit with a sharp pain when the finger is bent juuuuust right.

Live and learn. Best of luck.

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