There seems to be some doubt as to whether penetrating oil will actually penetrate the threads of the hex bolt on BMW brake rotors. Ultimate goal being not to strip the bolt head upon removal attempt.
Discuss...
There seems to be some doubt as to whether penetrating oil will actually penetrate the threads of the hex bolt on BMW brake rotors. Ultimate goal being not to strip the bolt head upon removal attempt.
Discuss...
Oil and heat.
HTC DNA, Williamsburg, VA
Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs l Maple Interior Trim
Have you seen the penetrating oil article?
Recently “Machinist Workshop Magazine” did a test on penetrating oils. Using nuts and bolts that they ‘scientifically rusted’ to a uniform degree by soaking in salt water, they then tested the break-out torque required to loosen the nuts. They treated the nuts with a variety of penetrants and measured the torque required to loosen them.
This is what they came up with:
Nothing: 516 lbs
WD-40: 238 lbs;
PB Blaster: 214 lbs;
Liquid Wrench: 127 lbs,
Kano Kroil: 106 lbs
(ATF)/Acetone mix (50/50): 50 lbs.
Course ATF/Acetone mix is flammable and probably not a good idea to heat up.
Also perhaps you can look into an Impact screwdriver too as well.
I like liquid wrench.
Impact screw driver FTW. Go by a motorcycle store or a Harbor Freight if you have one nearby, should only be $10-20.
Bruce
21 GMC Sierra - mine
16 X5 M-Sport - wife
11 M3 - 1st son
04 Tundra - 2nd son
17 X1 M-Sport - daughter
Former (mo/yr sold):
15 335xi M-Sport (8/18)
11 335is (8/17)
11 X5 AW/blk (11/15)
04 330xi blk/gray (7/15)
06 ZHP SGM/blk (6/15)
08 335xi blue/blk (4/15)
04 ZHPci MB/blk (2/14)
04 ZHPcic IR/Alc (10/13)
01 540iT anthra/blk (7/13)
04 ZHPci TIAG/blk (9/12)
03 540i M-Sport (9/12)
01 325ci (3/12)
02 325iT 5MT (10/11)
05 ZHPci (7/11)
03 330cic (2/11)
00 323ci (10/10)
I just did the same thing this weekend.
dane suggested heat and oil, no go. had a good DIY on drilling it out manually. You start with a smaller drill bit (about 2/3 width of screw head), grind it down about a half inch so it creates a centering mark then use a drill bit about .1" smaller than the actual bolt size and give it hell. eventually you'll snap the head right off and then pull the rotor. Then you can go to town on the tail of the screw. Mine was easy to get out with some oil and pliers after that.
hit me up if you need any help.
Call me Seth
CURRENT: 2016 Long Beach Blue BMW /// M2
RETIRED: ‘15 F22 M235i | '08 E90 M3 DCT "GoinHAM3" | '04 E46 M3 6MT "WEGOHAM"
'04 330i ZHP | '11 E82 135i | '08 E90 328xi | 07 E91 328xi SportWagon
Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs l Maple Interior Trim
Heat is your 1st line of defense. Take a torch, warm the bolt up nice. Then lean onto a wrench very gently... it's a bit of black art, you have to be able to gauge when the metal of the bolt begins to deform and you begin to strip the bolt. If this takes place, throw some PB blaster on it and give it an hour or so.
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