Stud to replace the crank bolt? - page 2 - General - VWDiesel.net The IDI, TDI, and mTDI source.

• #15 by jtanguay on 09 Dec, 2008 14:44
• Quote from: "truckinwagen"

  I will jump on this later today!
  
  so both the crank and camshaft bolts are 14x1.5?
  if so I will buy two and go for both!

  
  
  the camshaft bolt is listed as M12X1,5X35SW18 not sure what the SW18 means though... it also says hexagon head bolt (combi)
  
  now the camshaft bolt isn't as critical in this case, so the stock one should do... but the crankshaft stud idea is where its at  
• #16 by truckinwagen on 09 Dec, 2008 14:47
• just thinking, if they were the same I might as well do both, I like dealing with stud/nut way better than bolts anyway, especially when they locate the part like the crank and cam do.
  
  I will go ahead and buy one of these studs then and shove it on the motor!
  
  thank for the idea and the source!
• #17 by AudiVWguy on 09 Dec, 2008 21:10
• SO...........what kind of nut and washer are ya gonna use?
• #18 by jtanguay on 10 Dec, 2008 02:38
• Quote from: "AudiVWguy"

  SO...........what kind of nut and washer are ya gonna use?

  \
  
  yea we haven't fully decided on that.. yet.. but i do believe applying some moly lube might be a good idea to get some more torque applied.
  
  can anyone comment on that? what is the max the nut should be torqued at??? what can a 14mm stud handle???
  
  thanks
• #19 by lord_verminaard on 10 Dec, 2008 08:31
• From what I've seen, most M14x1.5 wheel studs are AT LEAST 8.8, which calls for 90 ft-lbs of assembly torque.  Most of the motorsport ones for VW are 10.9 or 12.9, although Bildon does not list the hardness on the ones they sell, I have seen similar ones at those hardness levels.  Assembly torque for 10.9 is 133 ft-lbs, and 12.9 is 145 ft-lbs.
  
  Brendan
• #20 by jtanguay on 10 Dec, 2008 10:16
• does anyone know a formula to calculate the clamping force PSI using thread pitch, etc?
• #21 by cyrus #1 on 10 Dec, 2008 18:49
• I can find out a formula that will work... My brother is a mechanical engineering student.  We will need to know the tensile strength of the material though.
• #22 by clbanman on 11 Dec, 2008 03:08
• http://www.engineersedge.com/calculators/torque_calc.htm
• #23 by jtanguay on 11 Dec, 2008 03:48
• 14mm to inch = 0.551181102
  
  Fastener Major Diameter (in.)
  =0.55
  
  Torque (in - lbs) Applied
  =110.2
  
  Axial "Clamp" Force (lbs)
  =1000
• #24 by vwt4 on 17 Dec, 2008 15:54
• Quote from: "jtanguay"

  Just a thought...  you could get wayyy more clamping force with less actual torque required that way.  i guess the problem is finding a place that sells something that big?
  
  thoughts?

  
  
  This is a very, very GOOD idea  
  
  I am seriously thinking about adding it before bolting my new crank pulley back up (and repaired crank).
  
  has anyone done it yet? pics!
• #25 by truckinwagen on 17 Dec, 2008 17:05
• well, I was going to do it, but as I was trying to figure out my fuel problem my timing slipped and I bent a few valves which means that all of my projects are on hold until after I get my head rebuild AGAIN.
  
  it really sucks pouring this much money and time into something I haven't been able to drive in six months.
  
  oh well, it gives me an excuse to port the head as it will have to come off anyway.
• #26 by jtanguay on 17 Dec, 2008 17:15
• i sent an e-mail to ARP but didn't get a response as of yet... i might try raceware as i'm sure they have 14mm studs out there with the right thread pitch on the one end, and the nice and low thread pitch (more clamping force) on the nut end.
• #27 by zukgod1 on 18 Dec, 2008 07:45
• I had much better luck calling ARP, E mail can be ignored I think.