Back in beige
Moderator: Bootsy
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Back in beige
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 !!
Tim Bennett
RHD Targa 2.2T EFI, Triumph ITB's, EDIS and Megasquirt.
"Old enough to know what's right and young enough not to choose it"
#1153
RHD Targa 2.2T EFI, Triumph ITB's, EDIS and Megasquirt.
"Old enough to know what's right and young enough not to choose it"
#1153
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Re: Back in beige
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.
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.
73T 911 Coupe, road/hillclimber 3.2L
Lola t 492 / 3.2 hillclimb racer
Boxster 987 Gen II 2.9
Lola t 492 / 3.2 hillclimb racer
Boxster 987 Gen II 2.9
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Re: Back in beige
Just buy new bolts and don't bother with 'shiny'
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Re: Back in beige
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...
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...
'68 912
Re: Back in beige
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.
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Re: Back in beige
This evening I adjusted the left rear trailing arm angle, then took these, just for you.Darren65 wrote:For a photographer this thread is becoming a bit 'wordy!'.....
'68 912
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Re: Back in beige
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...
Can anyone recommend anyone for a four-wheel alignment / corner balance? Preferably in the London, South or South East area...
'68 912
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Re: Back in beige
Looks gorgeous
The simple things you see are all complicated
I look pretty young but I'm just backdated yeah
I look pretty young but I'm just backdated yeah
Re: Back in beige
It lives! Nearly there, good work that man!
1970 911 2.2 S
2004 996 GT3 mk II
Renault 5 GT Turbo
BMW i3 REX
Jaguar F-Pace S 3.0 supercharged.
McLaren 12C spider
2004 996 GT3 mk II
Renault 5 GT Turbo
BMW i3 REX
Jaguar F-Pace S 3.0 supercharged.
McLaren 12C spider
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Re: Back in beige
Absolutely the dog's danglies!
Re: Back in beige
It looks great.
I know you know but don't forget to fit the wheel nuts before the mot!
I know you know but don't forget to fit the wheel nuts before the mot!
#1370
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Re: Back in beige
Looking great
Sent from my MotoE2(4G-LTE) using Tapatalk
Sent from my MotoE2(4G-LTE) using Tapatalk
“A REMINDER. I would be grateful if those members who have borrowed bits from me in emergencies (e.g starter motor, oil cooler, etc) would return them and/or contact me”. – Chris Turner RIP
- Darren65
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Re: Back in beige
....it's a start!jamie wrote:This evening I adjusted the left rear trailing arm angle, then took these, just for you.Darren65 wrote:For a photographer this thread is becoming a bit 'wordy!'.....
Car looks f@*king lush!
Darren
72T 2.5... http://ddk-online.com/phpBB2/viewtopic.php?f=10&t=56183
73 2.4E ... http://ddk-online.com/phpBB2/viewtopic.php?f=10&t=44242
77 Carrera 3.0...to 74 3.0RS ... http://ddk-online.com/phpBB2/viewtopic.php?f=28&t=63389
72T 2.5... http://ddk-online.com/phpBB2/viewtopic.php?f=10&t=56183
73 2.4E ... http://ddk-online.com/phpBB2/viewtopic.php?f=10&t=44242
77 Carrera 3.0...to 74 3.0RS ... http://ddk-online.com/phpBB2/viewtopic.php?f=28&t=63389
- Darren65
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Re: Back in beige
Rear end/exhaust is off the scale!
Serious congrats, awesome work.
Serious congrats, awesome work.
Darren
72T 2.5... http://ddk-online.com/phpBB2/viewtopic.php?f=10&t=56183
73 2.4E ... http://ddk-online.com/phpBB2/viewtopic.php?f=10&t=44242
77 Carrera 3.0...to 74 3.0RS ... http://ddk-online.com/phpBB2/viewtopic.php?f=28&t=63389
72T 2.5... http://ddk-online.com/phpBB2/viewtopic.php?f=10&t=56183
73 2.4E ... http://ddk-online.com/phpBB2/viewtopic.php?f=10&t=44242
77 Carrera 3.0...to 74 3.0RS ... http://ddk-online.com/phpBB2/viewtopic.php?f=28&t=63389
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Re: Back in beige
Thanks chaps
Feeling quite good about it right now.
!
Feeling quite good about it right now.
... and tighten the track rod bolts. And the track rod adjustment lock nuts.jb wrote:It looks great.
I know you know but don't forget to fit the wheel nuts before the mot!
!
'68 912