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Always Be Fixing Cars
Join Date: Nov 2012
Location: SE CT
Posts: 1,629
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Jetnuts on exhaust parts? What technology are the factory locknuts?
There are several threads on exhaust fasteners. I used extra fancy jetnuts from Coastfab on my alfa, and noticed that McMaster sells some but only in SAE sizes. See 98892A600 for instance for a 5/16" Silver-Plated A286 Super Alloy jetnut. This is a high temp locknut. These could be used with 4/15th studs on the X-over and similar exhaust parts where one side of the stud is not threaded into alum.
Does anyone know what type of locking action the factory M8 nuts have: Pelican Parts - Product Information: 900-910-097-02-OEM ? Are these deformed? There are no lock washers visible.
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'91 964 C4 - New Daily '73 Alfa GTV - 90% done 50% to go '65 912 - Welding in process Last edited by r-mm; 10-15-2013 at 06:56 AM.. |
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10-15-2013, 05:46 AM
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Registered
Join Date: May 2010
Location: atlanta
Posts: 1,981
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Quote:
Yes. |
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10-15-2013, 06:53 AM
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Always Be Fixing Cars
Join Date: Nov 2012
Location: SE CT
Posts: 1,629
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Are the M8 hex nuts holding the heat exchangers (#4) to headers locknuts? The PET suggests that are plain nuts.
The M8 nuts on the x-over pipe (#8) are indicated as locknuts. 
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'91 964 C4 - New Daily '73 Alfa GTV - 90% done 50% to go '65 912 - Welding in process |
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10-15-2013, 05:47 PM
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Always Be Fixing Cars
Join Date: Nov 2012
Location: SE CT
Posts: 1,629
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Sort of interesting discovery - the M8 nuts on the 930 (#7) are listed as locknuts whereas their counterparts on the NA car are not...
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'91 964 C4 - New Daily '73 Alfa GTV - 90% done 50% to go '65 912 - Welding in process |
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10-15-2013, 06:31 PM
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Senior Advisor
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high temperature lock nuts are mostly interference fit (deformed) and may not be noted in the parts catalog. i have used plain nuts and have had no problems.
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08 Cayenne Turbo |
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10-16-2013, 12:24 AM
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