ARP Headstuds on 1.6TD retorque or not?

[fatmobile]

 The cosworth is the 12mm stuff.
11mm work in the gas VW engines of the time.

 Something to concider with stud torque is the threads on the nuts isn't the same as the threads in the block.
 Course threads get torqued higher.
 Raceware has fine threads on the nut and a special lube so the torque is lower.

The problem with the stock 11mm headbolts is they are too short.
 They probably only have 1/2" into the block.
 Lots of stress in a small area.
 The studs go deeper and grab more threads,.. not sure if the metal is better.
 Also since the studs hold still and don't turn and grind on the threads as they are tightened
they aren't as likely to break the threads.

ARP part numbers: 204-4706 is 12mm
204-4701 is for the 11mm block

[libbydiesel]

The ARP Cosworth studs are 12mm and should not be used now that ARP has released VW diesel specific 12mm studs.  The part # that Fatmobile posted (204-4706) for the 12mm studs are for the correct VW studs. 

[Ohiobenz]

I'm pretty sure the ARP headstuds were 12mm.
I torqued to the 125 ft/lbs using the ARP provided lube.
It's got a fiber gasket, plus .030" copper O-Rings in the block.
At this point I'm going to run it....
If it starts to leak I'll be surprised. I was more worried about blowing the headgasket running 20-25psi boost.

[fatmobile]

That seems a little high @ 125.

 What did ARP recommend?

 You get 25psi out of your K14?

[ORCoaster]

I just retorqued the ARP studs I have on my Pickup to 90 ft/lbs.  Seems to have helped the injection of air into the coolant system at the 10 psi boost mark. 

[RustyCaddy]

The installation instructions included in the box of 204-4706 ARP head studs i have in the garage say to go up to 125lbs on the third step so all should be good.

There isn't any mention of fiber or metal head gaskets but the application sheet specifies both 1.6 and 1.9 liter VW/Audi diesels motors.

[77highboy77]

I torqued mine to the 125 ft/lbs ARP recommends on mine (12mm studs). I also retorqued them after a number of heat cycles and got up to an 8th turn on some of the nuts, so I would highly recommend retorquing. I am running a stock replacement head gasket.

[ORCoaster]

An update for those that might like to know.  I put 90 ft-lbs on the nuts and that seems to have stopped my overheating issue.  IF it comes back again I may jump it up to 100 but after that, I think it would be better to get a different HG and start over.  Once those things blow it is hard to get them tight enough.

[RustyCaddy]

That's great!.  If I end up going to 100 ft/lbs (on the 11mm studs) before you do will post about success/failure.

[ORCoaster]

Sure will, But I really don't want to be doing that.  I have the body work to get done and fooling around with the engine keeps me from sanding and painting.