Mike 66 Posted 30September, 2019 Report Share Posted 30September, 2019 Hi through a lot of internet surfing I have had no luck in identifying the bolts that tie the steering into the front suspension rack cross member 91134110101. ( I had a lot of parts in boxes!) not sure if should be m12 ... either that or threads are stripped in the alloy? Quote Link to comment Share on other sites More sharing options...
81SC Posted 30September, 2019 Report Share Posted 30September, 2019 Mike, The Porsche PET Katalog is a valuable resource when it comes to parts identification. You can download a copy from the Porsche website. Just use the drop down menu to select the appropriate model & year range, then click on the display box to open the PET pdf & then save this document to your computer. https://www.porsche.com/australia/accessoriesandservice/classic/genuineparts/originalpartscatalogue/ Item 8 on the PET shows the bolts to be M10 x 35mm for the 1975 on 911. I took a stab that your car is a 1976 model because of the date code on the front crossmember in your first photo. Quote Link to comment Share on other sites More sharing options...
Merv Posted 30September, 2019 Report Share Posted 30September, 2019 It is hard to be sure but the above schematic may suggest an M10 of some pitch. Mike do you have a tap and die set? If so then carefully test the thread and the particular thread pitch with a few M10 bolts to see the closest you can find. If needed clean the thread with a suitable tap. Quote Link to comment Share on other sites More sharing options...
Mike 66 Posted 30September, 2019 Author Report Share Posted 30September, 2019 Thanks again @81SC And @Merv thanks for the tips and links And yes correct 1976, the bolts I ran through into the steering rack where m12 and pulled straight out although I could feel them scrape across the threads. Which surprised me as I didn’t have much clearance from the cross member support( although as you can see it’s been clear coated so this may have reduced this diameter) I might have to retap! thanks again Quote Link to comment Share on other sites More sharing options...
81SC Posted 1October, 2019 Report Share Posted 1October, 2019 The steering rack holes are counterbored to 12mm above the 10mm x 1.5 pitch threaded hole, so I think that is why you're getting an M12 bolt to go into the steering rack mounting hole. The part that I don't understand is the 12mm bolt going through the front crossmember, normally this hole is about 11mm in diameter. In this photo of my steering rack you can see the counterbored hole above the 10mm threaded section. This is a M10 x 1.5 pitch bolt threaded into the rack, you can see the counterbore clearance around the M10 bolt, which would explain why you are getting a M12 bolt to go into this bolt hole but not engage a thread. Quote Link to comment Share on other sites More sharing options...
Merv Posted 1October, 2019 Report Share Posted 1October, 2019 Nailed it! Quote Link to comment Share on other sites More sharing options...
Mike 66 Posted 1October, 2019 Author Report Share Posted 1October, 2019 Thanks @81SC @Merv yes that does sense and confit by the photos.. thank you. I was trying to use 25and 30mm x m12 so they probably were only just getting to the tapered m10 thread start. . I was going to pull out the whole rack tomorrow to see what was going on .. you have save me a great deal of time. I will have another shot tomorrow. Again appreciate your help mike Quote Link to comment Share on other sites More sharing options...
Mike 66 Posted 4October, 2019 Author Report Share Posted 4October, 2019 @81SC m10 35mm worked a treat. Car now back on all fours after 12 months on a rotisserie.. the first of many monumental occasions for me! Thanks again Quote Link to comment Share on other sites More sharing options...
81SC Posted 4October, 2019 Report Share Posted 4October, 2019 On 30/09/2019 at 12:05, Mike 66 said: 12 minutes ago, Mike 66 said: @81SC m10 35mm worked a treat. Car now back on all fours after 12 months on a rotisserie.. the first of many monumental occasions for me! Thanks again Happy to help Mike. Can you share what you used & how you got that finish on your fuel tank, as seen in the photo. Quote Link to comment Share on other sites More sharing options...
Mike 66 Posted 4October, 2019 Author Report Share Posted 4October, 2019 Hi @81SC i used the Upol grey gravitex then clear coated with epoxy 2 k clear. Many coats. It gave the look of the “original” as you can’t get the grey wurth here but also easy to keep clean.. if it ever gets dirty as I found the straight gravitex.. like any other rubberised coatings get dirty very easily and you can’t get the dirt out of all the “pores” of the rubber coating i did the same underneath as well but used body 2 k epoxy then tinted raptor liner, then body colour and finally 2k. Clear.. looks great and again will hopefully stay that way for a long time Quote Link to comment Share on other sites More sharing options...
Stew F Posted 15October, 2019 Report Share Posted 15October, 2019 On 30/09/2019 at 19:01, Merv said: It is hard to be sure but the above schematic may suggest an M10 of some pitch. Generally, if not specified otherwise, metric fastener pitches can be assumed to be Metric Course. M10 would be an M10x1.5, whereas M/Fine threads would (should) normally written as (in this case, a 1mm pitch) M10x1.0 (in most cases), or M10-1.0 (occasionally, but technically, not the correct way). Quote Link to comment Share on other sites More sharing options...
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