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cchris
Samba Member
Joined: March 16, 2015
Posts: 91
Location: United States
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 Posted: Mon Mar 11, 2019 5:41 pm Post subject: EGR question for 76 bus |
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Does anyone know the thread pitch on the EGR shaft that holds the tapered sleeve on I took it to my local metric nut and bolt dealer and he wasn't able to find any nut that would screw on It appears to be 5mm?
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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 13627
Location: West Coast, USA
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| Posted: Mon Mar 11, 2019 5:53 pm Post subject: Re: EGR question for 76 bus |
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That is a swedged prevailing torque nut, so it's possible the threads have been damaged.
What's wrong with the old nut? It Should be tight to thread on.
You will probably need a tool to back-wrench the shaft to keep it from spinning.
Good luck,
Robbie
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SGKent 
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Joined: October 30, 2007
Posts: 42949
Location: at the beach in Northern Wokistan
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| Posted: Mon Mar 11, 2019 6:55 pm Post subject: Re: EGR question for 76 bus |
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I don't remember but I had a couple in my misc nuts and bolts bin. It isn't all that hard to find if you go to a descent hardware store that carries bins of different sizes. Home Depot or Lowes is probably not going to have it.
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aeromech
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Joined: January 24, 2006
Posts: 17753
Location: San Diego, California
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| Posted: Mon Mar 11, 2019 7:15 pm Post subject: Re: EGR question for 76 bus |
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No expert here but from my experience, you’ll find either a coarse or fine thread. Looks course from here
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cchris
Samba Member
Joined: March 16, 2015
Posts: 91
Location: United States
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| Posted: Thu Mar 14, 2019 1:47 pm Post subject: Re: EGR question for 76 bus |
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asiab3 That was a picture i found for an example I believe you're right and the threads were slightly stretched or damaged The EGR i have was never installed it was in a bag of parts missing the nut Last smog test it passed without EGR on it this time it failed with only 2200 miles on the same motor I can't find one person who will even look at it in my town So i'm doing everything i can figure to get it to pass in California or i may have to sell it out of state  California Sucks for Vw's |
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cchris
Samba Member
Joined: March 16, 2015
Posts: 91
Location: United States
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| Posted: Thu Mar 14, 2019 1:48 pm Post subject: Re: EGR question for 76 bus |
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| Thanks everyone for the input Hopefully i'll figure this out and get it to pass smog |
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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 13627
Location: West Coast, USA
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| Posted: Thu Mar 14, 2019 8:01 pm Post subject: Re: EGR question for 76 bus |
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Where are you located?
I make house calls and my clients have a 100% passing record....
Robbie @ Air-Schooled
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Abscate
Samba Member
Joined: October 05, 2014
Posts: 24435
Location: NYC/Upstate/ROW
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| Posted: Sat Mar 16, 2019 6:00 pm Post subject: Re: EGR question for 76 bus |
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Put a 10 mm scale on it and count threads. I’ll guess 10 threads in 1 cm
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Amskeptic
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Joined: October 18, 2002
Posts: 8586
Location: All Across The Country
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| Posted: Sun Mar 17, 2019 6:57 am Post subject: Re: EGR question for 76 bus |
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| cchris wrote: |
| asiab3 That was a picture i found for an example I believe you're right and the threads were slightly stretched or damaged The EGR i have was never installed it was in a bag of parts missing the nut Last smog test it passed without EGR on it this time it failed with only 2200 miles on the same motor I can't find one person who will even look at it in my town So i'm doing everything i can figure to get it to pass in California or i may have to sell it out of state California Sucks for Vw's |
Which metric was the "fail"?
If NOX, then yes, EGR.
If CO or HC, it is within your ability to adjust.
Colin
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tommu
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Joined: November 15, 2011
Posts: 665
Location: L.A.
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| Posted: Mon Mar 18, 2019 3:27 pm Post subject: Re: EGR question for 76 bus |
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| cchris wrote: |
| Thanks everyone for the input Hopefully i'll figure this out and get it to pass smog |
Hey Chris, if you already failed smog, now would be the time to call the ARB to ask what to do about the lack of parts availability. They should exempt you from needing an EGR valve.
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