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> Front end changeover in progress..., 8/8- Alignment woes
jk76.914
post Sep 9 2010, 07:45 PM
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I'm finally getting rid of the 4-to-5 lug adapters and doing a real Porsche 5 lug front suspension. Contrary to normal practice, which is normal for me, I guess, I'm installing real 914/6 struts with new Bilstein inserts. I bought the parts about 5 years ago on eBay, and the kit was all-inclusive, with freshly painted struts and new ball joints, bearings, rotors, pads, and brake hardware, and rebuilt M calipers. My excuse is I didn't know any better at the time, or I'd have looked for a later 911 set with the later bearing type, but alas, I own it now and everything is in real nice shape.

I think I'm good to go on parts and tools, but I'm trying to find out the torque requirement for the lock bolt for the ball joint. It's an M10 x 30mm x 1.5mm pitch, going into steel threads in the strut; presumably the lower part of the strut, below the tube, is forged.

Looks like an M10 grade 12.9 bolt is good for 50 ft-lbs, but I don't want to chance stripping out the threads. Nor do I want the BJ to pop because it's too loose. Does anyone know the torque spec? Thanks! Picture below-

PS- any tips for installing this type of strut? Thanks!

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jk76.914
post Jul 22 2011, 08:27 PM
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OK, I got it. As Eric indicated, the new rubber dust boots weren't slipping along the fresh (slightly granular) surface of the piston. It isn't supposed to, except to adjust for wear. It's intended to act as a spring to pull the piston back in slightly to get it away from the rotor when you release the brakes. As the pads wear, the piston travel will increase, until there is finally some slip along the piston to reset everything. On mine, because there was no slip (no adjustment), the seals pulled the pistons too far back into the cylinder. There was enough volume of displacement between the larger diameter of the M caliper and the too long travel of the pistons that the entire volume of the master cylinder was required to just push the pistons out near the rotor. So the pedal went all the way to the floor before the pads were tight between rotor and piston.

So first, I made myself a homemade set of pads. Real organics-
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I wanted them to be thinner than the new pads, but thicker than the backing plate. My goal was to get the pistons out enough to get that first slip of the rubber dust seal along the piston-
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I installed them into one caliper...
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And pumped the brake. The brake went from "nothing" to "not bad" in about five pumps! I removed the plywood brake pads, pried the pistons back in, reassembled the real pads and hardware, topped off the reservoir, and then repeated on the other side!
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As I pumped the brakes with the "organics" in, one nice thing is that I could hear the pistons coming out of the cylinders- actually the plywood was creaking as it was being crushed! Also, when I was all done, real pads installed, I could hear the equalizer in back of me thump every time I pumped. A good sign.

Feeling good about the brakes now. Still need to bleed the rears, but I'll do that after my first drive. Now on to the toe-in.

Thanks, everyone, for the suggestions!

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Posts in this topic
jk76.914   Front end changeover in progress...   Sep 9 2010, 07:45 PM
ripper911   :bump: IDK   Sep 10 2010, 05:18 PM
ArtechnikA   I think I'm good to go on parts and tools, bu...   Sep 11 2010, 05:32 AM
jk76.914   I think I'm good to go on parts and tools, b...   Sep 11 2010, 06:26 AM
ArtechnikA   ...This means that the bolt is at least a 10.9 gr...   Sep 11 2010, 06:31 AM
jk76.914   ...This means that the bolt is at least a 10.9 g...   Sep 11 2010, 07:15 AM
jk76.914   Picked up an official Bilstein gland nut wrench fo...   Sep 29 2010, 06:34 PM
Cap'n Krusty   Picked up an official Bilstein gland nut wrench f...   Sep 30 2010, 10:18 AM
jk76.914   Well, I bought those inserts back in '02 whe...   Sep 30 2010, 06:27 PM
Eric_Shea   Factory Manual = 47ftlbs. Not following... you ...   Sep 29 2010, 07:00 PM
ArtechnikA   99.9% of them are fine. One article in Pano and ...   Sep 30 2010, 04:43 AM
jk76.914   I lucked out. Thanks for the vote of confidence. ...   Sep 29 2010, 08:23 PM
Eric_Shea   OK... 98% Just saying... T-Struts, pinch or pin a...   Sep 30 2010, 09:14 AM
ArtechnikA   Just saying... T-Struts, pinch or pin are the per...   Sep 30 2010, 06:51 PM
Eric_Shea   Don't worry Jim... that's just our Cap...   Sep 30 2010, 06:33 PM
jk76.914   Don't worry Jim... that's just our Cap...   Sep 30 2010, 06:44 PM
Eric_Shea   :rotfl: Let me know how that turns out. ...   Sep 30 2010, 06:49 PM
Eric_Shea   The struts that were on 99.9% of the T's yes.....   Sep 30 2010, 08:03 PM
jk76.914   Getting this together finally. Painted the struts...   Jun 23 2011, 06:51 PM
ArtechnikA   Is there anything unique about this washer? I wou...   Jun 24 2011, 06:41 AM
jk76.914   Is there anything unique about this washer? I wo...   Jun 25 2011, 08:05 AM
jk76.914   Painted John Deere green. I coated it with Ben Mo...   Jun 23 2011, 07:00 PM
MoveQik   You can also see the stickers Bilstein sent me w...   Jun 23 2011, 10:20 PM
jk76.914   Starting point. Those 5 lug adapters have been on...   Jun 23 2011, 07:06 PM
Eric_Shea   Nice job on the struts... nine months oughts be en...   Jun 23 2011, 10:07 PM
FourBlades   I never knew about the wrench and never got one in...   Jun 24 2011, 06:50 AM
jk76.914   I never knew about the wrench and never got one i...   Jun 25 2011, 07:52 AM
jk76.914   Just finished a fit check of most parts. Everythi...   Jun 26 2011, 06:46 PM
jk76.914   bump. :bump:   Jun 26 2011, 06:47 PM
jk76.914   (shrinking pics to make my posts more readable) ...   Jun 26 2011, 06:48 PM
jk76.914   Thinking about it, maybe the struts are different ...   Jun 26 2011, 06:51 PM
jk76.914   Oops. Forgot to mention. Those plated dust shiel...   Jun 26 2011, 06:57 PM
ArtechnikA   Couldn't say for sure, since I've never do...   Jun 26 2011, 07:56 PM
Eric_Shea   Thanks Jim... Happy to help. Just bend the shield...   Jun 26 2011, 10:39 PM
jk76.914   Got the driver's side strut out. The castle n...   Jul 2 2011, 01:36 PM
ArtechnikA   I got tired of the sliding and just put some ...   Jul 2 2011, 01:45 PM
jk76.914   Well I'm finally getting closer. I replaced t...   Jul 21 2011, 04:33 AM
ArtechnikA   Regarding brakes- The brakes seem to be bled, no...   Jul 21 2011, 04:39 AM
jk76.914   ArtechnikA- Thanks for the comments, that may be ...   Jul 21 2011, 05:05 AM
ArtechnikA   The most effective combination was 5-7 psi at the...   Jul 21 2011, 05:17 AM
Eric_Shea   Leave it like it is and bed your pads using the pr...   Jul 21 2011, 09:12 AM
jk76.914   Leave it like it is and bed your pads using the p...   Jul 22 2011, 04:06 AM
jk76.914   OK, I got it. As Eric indicated, the new rubber d...   Jul 22 2011, 08:27 PM
jk76.914   Getting there. Devil's in the details I s...   Aug 7 2011, 06:42 PM
jk76.914   Built a big T-square to set toe. Before I started...   Aug 7 2011, 07:40 PM
jk76.914   Took it for alignment on Thursday morning. They c...   Aug 8 2011, 04:17 AM


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