DDK - Die Deutschen Klassiker

I spoke to one of our mechanical engineers. High tensile bolts are heat treated to achieve this high tensile property. By plating them and in the process heating them to 200c you are annealing the steel. Not sure what the effect of this is but I'd suggest that the evidence speaks for itself. He said simply get a new set of correct high tensile bolts and chuck the others away !!

If you simply zinc plate and passivate high tensile fasteners you will get/risk hydrogen embrittlement. This will manifest itself in total failure of the fastener under stress, ie done up tight.

Sometimes they will snap there and then, or in my experience over time!

I did this to some allen bolts and did not have then 'cooked' and every head on the suspension bolts snapped off over night.

You will have to throw them away and get some already plated properly. Lots of people do this but I've used Namrick for decades, always high tensile, always bright zinc plated with clear passivation (silver in colour) and NEVER a failure on my 911 and race cars.

Just buy new bolts and don't bother with 'shiny'

Thanks guys - good info.

Interesting to see how weak they became from the plating process. Not sure if it's heat or zinc embrittlement or what, but they're weak - very weak!

I've already ordered a full replacement set of bolts and schnorr washers - it was only twenty quid from Porsche.

Once that package arrives, the car will be ready for an MOT!

My god...

It's "hydrogen embrittlement" if you fancy a Google & light bedtime reading. I doubt 200C is enough to change the tensile properties but I'm defiantly not qualified to have that opinion.

Darren65 wrote:For a photographer this thread is becoming a bit 'wordy!'.....

This evening I adjusted the left rear trailing arm angle, then took these, just for you.

So the back still needs to come down. And the front.

Can anyone recommend anyone for a four-wheel alignment / corner balance? Preferably in the London, South or South East area...

Looks gorgeous

It lives! Nearly there, good work that man!

Absolutely the dog's danglies!

It looks great.
I know you know but don't forget to fit the wheel nuts before the mot!

Looking great

Sent from my MotoE2(4G-LTE) using Tapatalk

jamie wrote:

Darren65 wrote:For a photographer this thread is becoming a bit 'wordy!'.....

This evening I adjusted the left rear trailing arm angle, then took these, just for you.

....it's a start!

Car looks f@*king lush!

Rear end/exhaust is off the scale!

Serious congrats, awesome work.

Thanks chaps

Feeling quite good about it right now.

jb wrote:It looks great.
I know you know but don't forget to fit the wheel nuts before the mot!

... and tighten the track rod bolts. And the track rod adjustment lock nuts.

!