[Vwdiesel] ARP stud installation

Fri Aug 9 04:47:49 PDT 2013

Hi,
In my research during my 'experiment', I discovered in the case of studs, it is the nut that wants to be relatively friction free, and not the stud... Under no 
circumstances should the stud be a 'better' fit at the top of it's hole, than at the bottom, because the stud under stretch/tension can /could lift the casting. In 
other words, it needs to be very slightly tapered. I guess in normal events, even a parallel tap gives this as all it's cutting teeth pass the entrance, whilst only 
one reaches the bottom. If the stud itself is effectively slightly tapered then, the same problem occurs.

How the heck do you test for this? Maybe run a good fitting nut down the half of the stud that is going into the casting to check for evenness, and expect the 
threading into the casting[block] to firm up near full insertion. Run each nut up and down it's own stud around the operating region to mate it to the stud.
A s you will have gathered, I don't use studs, but then as I don't load my engine very heavily, I find that 95 lbft is adequate, but someone who its looking for 
every oz of clamping pressure available [hence the use of 12.9 rated studs], more care is needed as the strength of the block is approached.

In my hand right now, is a book called "Car Service Data".by J N Searle.
It covers all Brit/Jap/Eu cars/light vans in production during 1974 to 1985. Effectively covering the '60s to '90's in some cases! No pictures, but just loads of 
numbers. 
My interest had lain in the diesel timing numbers/angles, but looking at the head bolt numbers, they reveal much variation..Eg, Rover 2.4SD Turbo 21:1 
compression '82 to'85 final torque 58lbft, Whereas, the LandRover 2.25 Series 11A ('62 to'71) and Series 111 ('71 to '83), 23:1 comp; requires 90lbft

Mark

========================================
Message Received: Aug 09 2013, 07:43 AM
From: "R. Brown" 
To: "vwdiesel at vwfans.com" 
Cc: 
Subject: Re: [Vwdiesel] ARP stud installation

I put my Raceware studs in one at a time on my 1.9D engine. I pulled one bolt at a time, 
following the Bentley tightening sequence, ran a tap on an extension down the hole, then 
lubed and screwed the stud in place:
http://www.4crawler.com/Photos/102_pana/p1020051.jpg

Same process as Loren mentions. Then I think I took that stud up to the first torque spec. 
Then repeated for the rest of the studs and then went over all in sequence rechecking the 
first, then second and final torque specs. I think I drained the oil and coolant the night 
before. I think that was 8-9 yrs. ago, no leaks or any other issues since. I do recall 
that torquing those studs was so easy compared to watching the guy that did the TTY bolts 
that did the final torque in my old '81.

On 8/8/2013 10:53 PM, lbaird119 at aol.com wrote:
> All the Raceware I've done, I just ran them in either lightly double nutted or firmly finger tight, depending on how well they went. Never have done a 
single-at-a-time installation though, always a full set with the head off. The sealant they recommend tends to lightly hold them. With the fine thread nuts, 
the studs don't tend to want to spin so it's simply a matter of having them in enough to get enough "meat" to hold the stud and not pull out. Not too critical I 
would think.
> Loren
>
>
>
> -----Original Message-----
> From: dieseltdi 
> To: vw fans ; VW TDI Mail List 
> Sent: Thu, Aug 8, 2013 7:47 pm
> Subject: [Vwdiesel] ARP stud installation
>
>
> I have done this once before in the past but I can't seem to remember the
> orrect process and no instructions seem to be available. So, if I remove ONE
> tud at a time, clean the hole and then insert the new stud, do I just tighten
> t to spec using the standard 3 step process on the instructions in the box?
> ne link I found said you should tighten the stud, then loosen it, then tighten
> t and so forth SEVEN times before the final torque is set. What say ye all?
> ayden
> “There are many men of principle in both parties in America, but there is no
> arty of principle.”
> “I do not know if the people of the United States would vote for superior men if
> hey ran for office, but there can be no doubt that such men do not run."
> “I cannot help fearing that men may reach a point where they look on every new
> heory as a danger, every innovation as a toilsome trouble, every social advance
> s a first step toward revolution, and that they may absolutely refuse to move
> t all.” Alexis de Tocqueville
>
> isit my website at: http://mysite.verizon.net/resosxp8/mydieselpages/
> roud owner of:
> 004 Jetta GL PD TDI
> 968 Beetle, my latest project, watch for details
> 982 VW Jetta Coupe with GTD turbo diesel transplant (in progress)
> nd many, many, many VWs; from a 1947 Beetle (13 Beetles total), to Vans (5 - 3
> plitties, 2 bay window (both were campers), 1 Vanagon Westy, Rabbits (3),
> armen Ghia (1), Jettas (9), Passats (2), Dasher (1), New Beetle (1), Rabbit
> onvertible (1) and Rabbit Pickups (3) most now gone but not forgotten.
>
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-- 
Roger

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