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Join Date: Dec 2006
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Porsche Crest Bolts get loose on turbo flange

The bolts that connect the turbo to the header seems to get loose with the heat. I've tried stacking an extra nut on each bolt as a lock nut. I'm thinking of switching the bolts to fine thread. Any ideas?
Old 04-15-2008, 11:26 PM
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are you using locking nuts?

I just went down to the local P-car shop and they had them. They were either copper or brass, cant remeber. make sure you dont use regular metal bolts b/c they will get stuck.
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John A.
1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.)
05 Boxster S: For the Track.
06 Dodge Ram 2500 Power Wagon: Tow Vehicle
Old 04-16-2008, 08:44 AM
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cycling has-been
 
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factory calls for:

bolts - 900 074 284 02 - (4 x $11.25 ea @ Pelican)
nuts - 900 910 099 02 - (4 x $3.50 ea)

this is the set up I used on mine with no problems - even after the system has been off/apart 2-3 times

Bill K
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Last edited by bkreigsr; 04-28-2008 at 04:13 AM..
Old 04-16-2008, 01:00 PM
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The lock nuts are steel, but they're copper coated. I haven't had one loosen, but just to be safe I replace them rather than reusing.
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2014 Cayman S
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Old 04-16-2008, 01:03 PM
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My car had the two rear nuts linked. There was not 4 nuts, but 2 nuts and 1 special part that looked like 2 nuts joined together with a piece of metal.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 04-27-2008, 02:13 PM
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wcc wcc is offline
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I used 'Stover' nuts from the local Mid-State Bolt and Screw place. They are crushed/ovaled nut that is basically a lock nut. Of course I used flat washers as well.
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Old 04-27-2008, 03:55 PM
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That's how K nuts work too.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 05-02-2008, 12:09 PM
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