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Old 08-30-2016, 04:37 PM
Join Date: Dec 2007
Posts: 5,061
Used MAP gas to heat allen head bolts, thinking of taking it to tire shop.

Besides using MAP gas torch on the allen head bolts, I soaked them AGAIN in PB Blaster. I am unable to get the bolts to budge while using my braker bar. I do have an extension I can place on the breaker bar (handle for my Sears Craftsman 3 ton floor jack) but I'm going to need a friend to stand on the tire while I try to break loose the allen bolts holding the rotor to the hub using the four foot extension bar from the floor jack. I'm using a 10mm HEX BIT. I'm concerned that I may strip the allen heads. I'm thinking of taking the entire hub/rotor/tire to a tire shop and ask them to remove it using an impact wrench.

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Old 08-30-2016, 05:09 PM
Join Date: Jan 2016
Posts: 1,329
Having done this job in the past, I've always removed the tire, remove the caliper and safely hang it out of the way, remove the split nut and then remove the entire hub/rotor from the spindle (keeping the bearings from dropping out onto the ground!).

Then get the hub into a bench vice, take your 10mm Allen tool and place it into the bolt head and give it a couple hard hits straight on to shock and hopefully loosen the threads from the rust locking it in place, then with the part secured in the vice, apply force to those Allen bolts making sure you keep the tool fully seated, straight and square as you apply force. They usually break free when you're hanging on the breaker bar!

I don't know that heating the heads will help a whole lot the bolt threads and what threads they interface with is where apply heat will make the most difference.
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Old 08-30-2016, 06:33 PM
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Join Date: Aug 2011
Location: Carolina
Posts: 1,416
Having a friend stand on the tire will probably make it doable. Use that jack handle again.
Current fleet
1992 300D "IceBerg"
1984 300D "Blues Mobile"

1978 300CD "El Toro" Gone on to be born again
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Old 08-30-2016, 07:35 PM
Registered User
Join Date: Aug 2015
Posts: 67
pull hub off turn upside down on ground and remove bolts with impact then replace rotor and reinstall bolts with blue locktight
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Old 08-30-2016, 11:37 PM
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Waiting for his Model 3..
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
Just bolt the hub back into the wheel, have a buddy stand on the wheel / tire, then use your big breaker bar.

Mine required this. Once I broke them free they came out by hand

1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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Old 08-31-2016, 12:10 PM
Senior Member
Join Date: Sep 2002
Posts: 2,795
While applying pressure to loosen the allen bolts have a helper hit the breaker bar with a hammer in such a way as to drive the socket into the bolt. We use this technique all the time to remove stubborn wheel bolts. If you can, use a cheater bar over the breaker bar handle.......
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Old 09-01-2016, 08:24 PM
Join Date: Dec 2007
Posts: 5,061
After lots and lots of PB Blaster and multiple treatments with MAP Gas, I took the front hub/rotor off the 1991 560SEL to a tire shop. They used an air impact wrench; all the bolts were loose within 30 seconds!!! I'm now in the market for an impact wrench. Any particular brand/model that you may care to recommend?

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