Parts Catalog Accessories Catalog Tech Info Tech Forums
 
  Search our site:    
 Cart  | Project List | Order Status | Help    
  Join us November 1st for Casino Night at the Pelican Parts Open House!
Benefiting LuMind - Research and Treatment for individuals with Down Syndrome
Go Back   Pelican Parts Technical BBS > 1- Porsche Technical Forums > Porsche 911 Technical Forum

Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
fxeditor's Avatar
 
Join Date: May 2005
Location: Burbank, CA
Posts: 727
Garage
Stuck Shock Bolt!!!!

Hi All,
I have been trying to get the rear lower shock bolts off my car for the better part of the day and I am out of ideas! I've tried PB Blast (applied last night), impact wrench, big a$$ breaker bar, and even using a jack to press up on a flare-nut wrench! The only thing that all this has accomplished is starting to round off one of the corners of the bolt! I haven't tried heat yet because I don't have a propane torch but I think I might pop down to Home Depot and pick one up. The other thing I was going to try was to get a higher end impact gun. Can anyone else think of something to try?




Thanks for any advice you can give,

Michael
__________________
-- '91 Bianchi Forza (the daily "driver")
-- '87 Diamond Blue Coupe
-- '92 Miata
-- '06 Scion XB (the wife's)
-- '01 Audi S4 (Sold)
Old 02-21-2010, 01:39 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #1 (permalink)
Registered User
 
Join Date: Oct 2004
Posts: 8,517
I'm going to wait awhile until I recommend another pipe wrench approach. I don't want it to get old.
Old 02-21-2010, 02:00 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #2 (permalink)
Registered User
 
holtjv's Avatar
 
Join Date: Apr 2006
Location: Austin
Posts: 1,625
Looks like it's already pretty rounded off.

I'd go the route of the dremel and be done with it in 10 minutes.
__________________
Warren Hall (Early S Man), 1950 - 2008
------------------------------------
2006 Tri D675 Scorched Yellow
2006 Ducati Sport Classic mono SOLD
1979 SCWDP #0020 Talbot Yellow SOLD
Old 02-21-2010, 02:44 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #3 (permalink)
Registered User
 
HarryD's Avatar
 
Join Date: May 2002
Location: Portland, Oregon
Posts: 8,617
I do not which impact wrench you used.

short story. To do my wheels, I bought one of the those 250 ft-lb Harbor Freight units. All it did was make noise and use air. It couldn't loosen a 94 ft-lb lug nut off the stud. I got their 625 ft-lb unit and a quick tap and off it comes.

Try a better Torque wrench.
__________________
Harry
1970 VW Sunroof Bus - "The Magic Bus"
1973.5 911T Targa - "Smokey"
2008 Ford Fusion
2009 MB C300

Last edited by HarryD; 02-21-2010 at 05:34 PM.. Reason: typo!!
Old 02-21-2010, 02:55 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #4 (permalink)
Registered User
 
wdfifteen's Avatar
 
Join Date: Mar 2008
Posts: 9,293
Quote:
Originally Posted by fxeditor View Post
Hi All,
I have been trying to get the rear lower shock bolts off my car for the better part of the day and I am out of ideas! I've tried PB Blast (applied last night), impact wrench, big a$$ breaker bar, and even using a jack to press up on a flare-nut wrench! The only thing that all this has accomplished is starting to round off one of the corners of the bolt! I haven't tried heat yet because I don't have a propane torch but I think I might pop down to Home Depot and pick one up. The other thing I was going to try was to get a higher end impact gun. Can anyone else think of something to try?




Thanks for any advice you can give,

Michael
I feel your pain. You really need to preserve the hex on the end of that bolt. Given the state of the bolt head at this point, I would make sure I had a good 6 point impact socket and go at it with an impact wrench. Even if you have to buy the tools, it's the best way to go. Once the head of that bolt it toast you are in a world of hurt and you'll be wishing you'd spent the $200 or whatever.
I hate to bring it up at this point, but PB Blaster and other penetrating oils work on the threads. You should have been shooting it at the joint between the shock and the casting that the bolt threads into. Not that it would have done you much good...
__________________
.
Old 02-21-2010, 03:01 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #5 (permalink)
Weekend Mechanic
 
targamaniac's Avatar
 
Join Date: May 2008
Location: Toronto, Canada
Posts: 682
Send a message via MSN to targamaniac Send a message via Yahoo to targamaniac
Hey there, I had a lot of fun last night doing the same thing you're doing. I higher torque impact gun is a must for this kind of thing, although it should move if you use a straight bar with a 4 or 5 foot pipe extension. To make things far easier, and to minimize damage to the thread of the bolt and the trailing arm, and reduce the amount of force you need to use to remove the bolt, use a jack under the brake disk to compress the shock and remove pressure on the bottom bolt (this assumes you haven't already removed the top bolt). Good luck.

J
__________________
86 911 Carrera Targa
Old 02-21-2010, 03:27 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #6 (permalink)
 
Now Available for Ordering:   101 Projects For Your BMW 3 Series 1982-2000  [more info]
Registered User
 
rbuswell's Avatar
 
Join Date: Feb 2006
Location: Castle Rock, Colorado
Posts: 523
Garage
Porsche Crest I had the same trouble a couple years back

Michael, keep using the PB Blaster (over and over and over again) perhaps over a couple day's time without trying to break it loose. File down the parts of the bolt head you've rounded and then get a really good six point socket (at least 1/2 and maybe even 3/4 inch drive). Put the longest breaker bar you can find or borrow on it and THEN put about a 36" to 48" steel pipe (about $3-4) from Home Depot over the shaft of the bar. BTW, use a socket and breaker bar that will be replaced if you break it/them (Craftsman, etc.) and wear really good protective clothing and eye protection. Also make sure you have it really secure on the jack stands. It will break loose! But it's a bugger especially if it has never been off.

The bolts aren't that expensive or hard to get so try not to worry too much about them.
__________________
1982 911SC Coupe (Zinc Metallic w/ Dark Blue interior)

Last edited by rbuswell; 02-21-2010 at 03:37 PM.. Reason: Oh, and one more thing ...
Old 02-21-2010, 03:32 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #7 (permalink)
Registered User
 
175K911's Avatar
 
Join Date: Sep 2007
Location: Wheaton, IL (Chicago 'burbs)
Posts: 2,497
Heat may be your friend. When I tried to get the shock bolts out of my current '86, they wouldn't budge. Tried everything else and finally put head to the control arm. About a minute into the heating process there was a puff of smoke and out the bolt came.
Apparently somewhere in the history of the car before I owned it someone put Loctite on the bolt and it needed heat to melt before the bolt would turn. But be careful, the last thing you want to do is damage the threads in the control arm.
__________________
Ed
'86 911 Coupe (undergoing an endless 3.6 transplant)
'10 Yukon Denali, the tow vehicle
'97 BMW 528i (the sensible car, bought new)
'12 Vintage/Millenium 23' v-nose enclosed trailer
Old 02-21-2010, 03:43 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #8 (permalink)
Registered User
 
Join Date: Oct 2002
Posts: 1,378
Quote:
I'm going to wait awhile until I recommend another pipe wrench approach. I don't want it to get old.
Bingo ! but did you use the correct size when trying to get it off yourself ? looks like you used the wrong size to begin with ...
__________________
87 Carrera Backdate
Old 02-21-2010, 03:50 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #9 (permalink)
Registered User
 
rbuswell's Avatar
 
Join Date: Feb 2006
Location: Castle Rock, Colorado
Posts: 523
Garage
Porsche Crest Good stuff

Quote:
Originally Posted by 175K911 View Post
Heat may be your friend. When I tried to get the shock bolts out of my current '86, they wouldn't budge. Tried everything else and finally put head to the control arm. About a minute into the heating process there was a puff of smoke and out the bolt came.
Apparently somewhere in the history of the car before I owned it someone put Loctite on the bolt and it needed heat to melt before the bolt would turn. But be careful, the last thing you want to do is damage the threads in the control arm.
I think I used a little heat too but I didn't get a puff of smoke or anything. I doubt the Loctite theory since I don't believe even really good Loctite will stand up to that much torque ... they just get rusted and set in and they don't want to let go. The best thing I can tell you is what I told you before and that is that they will come loose. It is soooooo scary when they won't budge but with enough force and PB Blaster they will eventually give up. You will hear a really funny sound like a door creaking and then they will slowly get looser and looser. The bolts are really hard so they can stand some abuse.
__________________
1982 911SC Coupe (Zinc Metallic w/ Dark Blue interior)
Old 02-21-2010, 04:07 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #10 (permalink)
Registered User
 
HarryD's Avatar
 
Join Date: May 2002
Location: Portland, Oregon
Posts: 8,617
Quote:
Originally Posted by rbuswell View Post
...
The bolts aren't that expensive or hard to get so try not to worry too much about them.
FWIW,Per the PET (http://www.porsche.com/all/media/pdf/originalparts/en/E_911_89_KATALOG.pdf), the bolts may be an unusual size M14x1.5 85 mm. Per Pelican they are NLA. I looked in the McMaster Carr Catalog (http://www.mcmaster.com). They offer a 80 and a 90 mm version.

In my 73, the lower shock is mounted by a nut and bolt. I think you car is the same.
__________________
Harry
1970 VW Sunroof Bus - "The Magic Bus"
1973.5 911T Targa - "Smokey"
2008 Ford Fusion
2009 MB C300

Last edited by HarryD; 02-21-2010 at 04:19 PM..
Old 02-21-2010, 04:16 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #11 (permalink)
Registered User
 
Join Date: Oct 2004
Posts: 8,517
Quote:
Originally Posted by Dutchie View Post
Bingo ! but did you use the correct size when trying to get it off yourself ? looks like you used the wrong size to begin with ...
The Ingersoll Rand impact wrenches are terrific, to keep in mind for the next time you buy one.

For now, you can heat the thread area of the trailing arm for a few minutes with a mapp gas torch (two tanks, including the oxygen). This will expand the thread area, and loosen the bolt. Then try with a 6-point socket, as already noted.

Once the hex shaped edges are damaged or start to get rounded, you can either cut the bolt head off with a dye grinder (why people always use Dremels is sort of ??), or some other cutting tool, then take the bolt off with a pipe wrench, or you can go straight to a pipe wrench now.

Get a big azz pipe wrench, not a teeny tiny one. One that is about 3' long and made out of steel. You will use this thing for the rest of your life, so buy a good one. It will take that bolt right out, so be ready.

Always always wrench downward. Do not loosen this bolt upward unless you want to knock yourself silly right on the forehead. Forget about re-using that bolt. It's gone.
Old 02-21-2010, 04:48 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #12 (permalink)
 
Now available:  101 Projects for Your Porsche Boxster!
Registered User
 
rbuswell's Avatar
 
Join Date: Feb 2006
Location: Castle Rock, Colorado
Posts: 523
Garage
Porsche Crest

Quote:
Originally Posted by HarryD View Post
FWIW,Per the PET (http://www.porsche.com/all/media/pdf/originalparts/en/E_911_89_KATALOG.pdf), the bolts may be an unusual size M14x1.5 85 mm. Per Pelican they are NLA. I looked in the McMaster Carr Catalog (McMaster-Carr). They offer a 80 and a 90 mm version.

In my 73, the lower shock is mounted by a nut and bolt. I think you car is the same.
I hope it doesn't come to this but one or both of these places should have them:

AAA Metric Supply Inc.

MARYLAND METRICS 'HOME PAGE'

I believe Michael's car doesn't have a nut, only a bolt into the trailing arm.
__________________
1982 911SC Coupe (Zinc Metallic w/ Dark Blue interior)
Old 02-21-2010, 04:51 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #13 (permalink)
Registered User
 
Join Date: Oct 2004
Posts: 8,517
He should be able to find a good used one at a wrecking yard.
Old 02-21-2010, 04:52 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #14 (permalink)
Registered User
 
rbuswell's Avatar
 
Join Date: Feb 2006
Location: Castle Rock, Colorado
Posts: 523
Garage
Porsche Crest Keeps getting better

Quote:
Originally Posted by rusnak View Post
For now, you can heat the thread area of the trailing arm for a few minutes with a mapp gas torch (two tanks, including the oxygen). This will expand the thread area, and loosen the bolt. Then try with a 6-point socket, as already noted.

Once the hex shaped edges are damaged or start to get rounded, you can either cut the bolt head off with a dye grinder (why people always use Dremels is sort of ??), or some other cutting tool, then take the bolt off with a pipe wrench, or you can go straight to a pipe wrench now.

Get a big azz pipe wrench, not a teeny tiny one. One that is about 3' long and made out of steel. You will use this thing for the rest of your life, so buy a good one. It will take that bolt right out, so be ready.

Always always wrench downward. Do not loosen this bolt upward unless you want to knock yourself silly right on the forehead. Forget about re-using that bolt. It's gone.
Quote:
Originally Posted by rusnak View Post
He should be able to find a good used one at a wrecking yard.
You won't have to torque it back on that much (60 lbs. if memory serves) so if you can save the bolt you should. It'll be fine going back on if you can get a decent purchase on the hex head and you've cleaned the threads in the trailing arm. If you use a monkey wrench the bolts a goner.

+1 on pushing the wrench down. Not only can you whack your forehead pretty good but you can actually lift the car off the jack stands (especially since you have the engine out).

+1 on the junkyard bolt except you'll have to get it off the junker too. Best bet is to not make the bolt worse and just get it off with a little patience. That's my $.02 anyway.
__________________
1982 911SC Coupe (Zinc Metallic w/ Dark Blue interior)
Old 02-21-2010, 05:07 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #15 (permalink)
Registered User
 
Join Date: Oct 2004
Posts: 8,517
I guess one could pad the jaws of the pipe wrench, but that would make it more prone to slipping.

The large, well made pipe wrench will hold tension much better than the small Harbor Freight ones. This will make the jaws much kinder to the metal, and less likely to bite down. It's the floppy, clanky small pipe wrenches that do harm to the subject metal, not the larger or better made ones.
Old 02-21-2010, 05:16 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #16 (permalink)
Registered User
 
fxeditor's Avatar
 
Join Date: May 2005
Location: Burbank, CA
Posts: 727
Garage
Hooray they're out! Getting the high-end impact gun did the trick. Thanks to everyone for your help.

Michael
__________________
-- '91 Bianchi Forza (the daily "driver")
-- '87 Diamond Blue Coupe
-- '92 Miata
-- '06 Scion XB (the wife's)
-- '01 Audi S4 (Sold)
Old 02-21-2010, 05:19 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #17 (permalink)
Registered User
 
fxeditor's Avatar
 
Join Date: May 2005
Location: Burbank, CA
Posts: 727
Garage
Hooray they're out! Getting the high-end impact gun did the trick. Thanks to everyone for your help.

Michael
__________________
-- '91 Bianchi Forza (the daily "driver")
-- '87 Diamond Blue Coupe
-- '92 Miata
-- '06 Scion XB (the wife's)
-- '01 Audi S4 (Sold)
Old 02-21-2010, 05:19 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #18 (permalink)
Registered User
 
HarryD's Avatar
 
Join Date: May 2002
Location: Portland, Oregon
Posts: 8,617
Quote:
Originally Posted by fxeditor View Post
Hooray they're out! Getting the high-end impact gun did the trick. Thanks to everyone for your help.

Michael
Great!!!

Will you be able to reuse the bolt?
__________________
Harry
1970 VW Sunroof Bus - "The Magic Bus"
1973.5 911T Targa - "Smokey"
2008 Ford Fusion
2009 MB C300
Old 02-21-2010, 05:35 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #19 (permalink)
Registered User
 
Join Date: Sep 2002
Location: Westchester County, NY
Posts: 1,197
Garage
Glad to hear you got it out. Sometimes temporarily maxing out the limits are your compressor's pressure switch can do the trick too. Some cut out around 90PSI but the pressure relief valve can withstand up to 125 or so. They're all different.
__________________
1986 930, 1969 Mach1, 2003 540 Sport
Old 02-21-2010, 05:36 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #20 (permalink)
Old 02-21-2010, 05:36 PM
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 



All times are GMT -8. The time now is 10:12 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.