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Engine Specific Info and Questions => IDI Engine => Topic started by: sparkoid on September 21, 2012, 10:43:26 am

Title: 11 mm Head bolt woes; go to studs?
Post by: sparkoid on September 21, 2012, 10:43:26 am

After a reman cyl head and new rings for my 1.6na, and intermediate headaches described here in other threads, I put the original 11 mm head bolts back, torqued 'em up in 3 stages per the Bentley, and fired up the engine to warm it up for the first re-torque.  When I did, I got a pop and no more torque out of one of the bolts.  Backed it out, bolt is fine so threads probably sheared off in the block.  I had put a dab of Permatex anti-seize compound on each bolt, and am now concerned that even using the Bentley numbers (50,70,90 Nm) I effectively over-torqued the block threads due to the lower friction from the anti-seize(?).

I know the 11's are known to be weak, and I've likely abused mine.  Am wondering if I can save the block by time-serting the threads and using ARP's or Raceware's studs along with whatever lube they supply or recommend.  Opinions?  Am I wasting my time?  If this were a horse I'd be calling the glue factory...

Title: Re: 11 mm Head bolt woes; go to studs?
Post by: libbydiesel on September 21, 2012, 10:58:41 am

Opinions?  Mine is that you're wasting your time. 

Title: Re: 11 mm Head bolt woes; go to studs?
Post by: R.O.R-2.0 on September 21, 2012, 11:10:19 am

im with libby on this..

the 11mm block is the problem..

even with $500 worth of timeserts, it wont be any better

it will be a 11mm block with $500 worth of time serts, and the same cracks..

Title: Re: 11 mm Head bolt woes; go to studs?
Post by: burn_your_money on September 21, 2012, 11:15:32 am

With all the work you've done to the engine I'd put in a timesert or something and use studs. Don't retorque after warming the engine up or running it for 1000kms, it's not necessary in my experience.

Unless you can get a cheap 12mm block that is...

Title: Re: 11 mm Head bolt woes; go to studs?
Post by: sparkoid on September 22, 2012, 08:30:33 am

Ouch!

I've calmed down from this latest frustration, but forget the 12 mm block; if I have to replace the block, its either going to be with a complete engine or an eBay ad for a roller.  The block is not cracked, just missing threads (which came out wrapped around the otherwise pristine bolt).

I already have a time-sert kit ($100, not $500:  https://www.belmetric.com/ts1115-m11x15-kit-p-1532.html?cPath=217_218_238 ), so I'll probably roll the dice with another $100 or so for studs.

Title: Re: 11 mm Head bolt woes; go to studs?
Post by: 92EcoDiesel Jetta on September 22, 2012, 10:19:26 am

Is ur vin below or equal to 176338? If so it's an 11 mm block provided it's the orig engine.