17 replies to this topic

[mark205gti]

Brand new head studs and nuts... this occurred during torquing. I was even using ARP lube. Is this common or just a flaw in the product.

 

 

 

 

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[Spider]

I've not had that happen with a Head Nut - yet.

 

I've had similar a few years back happen on Big End Nuts. That was the day I swapped to ARP 'down stairs' and I won't go back now.

[mark205gti]

Haha. Yeah. I’m glad I used ARP on the conrods and mains. At least this is an easy fix up top!

[Rorf]

Please tell us which company supplied these nuts - their quality control looks bad and we need to stay away from them

[mk1leg]

looks like theres a fault on the nut small mark on lower half

[Benoit_Dupont]

Quality of parts those days...

[Fast Ivan]

Do the instructions call for lube? ARP or not, if it doesn’t call for lube then you may very well have over loaded then.

Edited by Fast Ivan, 13 October 2019 - 10:03 AM.

[Spider]

Do the instructions call for lube? ARP or not, if it doesn’t call for lube then you may very well have over loaded then.

 

From the Part Number on the Bag, and it's appearance, it does look to be a Factory Item. In answer to your question regarding lube - yes

 

[mark205gti]

So I was torquing up in stages following that exact diagram that MokeSpider posted from my Haynes. I do them quarter of a turn at a time with the wrench and then move to the torque wrehnch; 25 ft-lb (lowest reading on torque wrench), then 30, 40, 50. This nut let go at probably like 35 when it started plastically deforming and then 'pang'!

 

I even put a bit of the lube on the face of the head as well. But this one was never going to reach full torque. Must have been a defect and could be what mk1leg saw. I'll look more closely next time im in the garage at that mark.

 

They are just the standard factory item. I don't feel like it is the suppliers problem so don't need to blame them, but I've emailed them to ask for replacement. But it does make me weary of the nuts. I've gone back to the original head nuts, which actually are feel more solid and weigh more. I don't see any issues with the studs from the same kit, but will look at switching them all out for an ARP or competition set after the engine is run in (mainly due to postage times to NZ).

[Rorf]

Brand new head studs and nuts... this occurred during torquing. I was even using ARP lube. Is this common or just a flaw in the product.

 

I recognize the writing on the packet and so know the company that sold them - very worrying indeed.

[Mini Manannán]

 

Brand new head studs and nuts... this occurred during torquing. I was even using ARP lube. Is this common or just a flaw in the product.

 

I recognize the writing on the packet and so know the company that sold them - very worrying indeed.

 

 

 

Me too!  I've seen that handwriting many, many times

[JonnyAlpha]

Oh dear - I have just bought some Conrod ARP Nuts and Bolts, mine came in an ARP sealed packet - shouldn't these have come in the same ARP packaging?

[gazza82]

Oh dear - I have just bought some Conrod ARP Nuts and Bolts, mine came in an ARP sealed packet - shouldn't these have come in the same ARP packaging?

Not sure that broken head nut was ARP if that's what you meant ...

Edited by gazza82, 14 October 2019 - 06:41 PM.

[Curley]

Are you sure these are genuine? All the ARP bolts I've ever ordered have never come in hand written plastic bags. The mini set should be in a blue box.

[PoolGuy]

I think the thread title is slightly misleading, I think the op is asking 'do you start buying ARP because the standard nuts do this'? The broken nut is a Mini******** supplied item surely?