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birddog1 Samba Member
Joined: March 11, 2006 Posts: 953
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Posted: Sun Jun 13, 2021 12:49 pm Post subject: PICT 34 volume control screw question |
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I've spent my VW life with pre-70's bugs so I'm having me some fun working on a 73 lately. The "new" fangled distributors and carb specifically. I'm getting close to the finish line. But a question on adjusting the carb volume control screw.
I've looked at the Volkzbitz site where he has instructions on the initial setting up of the PICT34. He notes for the volume screw "turn the volume screw in until it comes to a stop,then turn out 4 full turns".
So I'm wondering, I can feel there's a point when closing it where the 0-ring on the screw is making resistance but the screw isn't all the way seated. I'm a little nervous about pushing ahead out of fear of messing up the 0-ring.
Do I keep going until it's fully seated or does "comes to a stop" mean when the o-ring is giving resistance?
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kreemoweet Samba Member
Joined: March 13, 2008 Posts: 3900 Location: Seattle, WA
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Posted: Sun Jun 13, 2021 2:17 pm Post subject: Re: PICT 34 volume control screw question |
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When that screw is "closed" it seats metal-to-metal, and is clearly
different than the friction given by the o-ring. _________________ '67 bug: seized by the authorities
'68 bug: seized by the authorities
'71 kombi: not yet seized by the authorities
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busdaddy Samba Member
Joined: February 12, 2004 Posts: 51163 Location: Surrey B.C. Canada, but thinking of Ukraine
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Posted: Sun Jun 13, 2021 2:56 pm Post subject: Re: PICT 34 volume control screw question |
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But......, if the O ring is sticking and it requires an inordinate amount of torque to turn it is possible to wind the tip of the screw right through the seat down in the carb, I've seen people who have no sense of torque do it.
When in doubt remove the screw and oil the O ring. _________________ Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
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Слава Україні! |
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birddog1 Samba Member
Joined: March 11, 2006 Posts: 953
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Posted: Sun Jun 13, 2021 3:26 pm Post subject: Re: PICT 34 volume control screw question |
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busdaddy wrote: |
But......, if the O ring is sticking and it requires an inordinate amount of torque to turn it is possible to wind the tip of the screw right through the seat down in the carb, I've seen people who have no sense of torque do it.
When in doubt remove the screw and oil the O ring. |
It's a new o-ring and very grabby.Taking more torgue than I like to move it. I was worried about popping it out of the groove and tearing up the o-ring, but running the screw through the carb is also interesting lol.
I like the oil idea.
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planenut Samba Member
Joined: April 12, 2012 Posts: 334 Location: Georgia
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Posted: Sun Jun 13, 2021 4:24 pm Post subject: Re: PICT 34 volume control screw question |
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You'll know when it actually bottoms out. |
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Tim Donahoe Samba Member
Joined: December 08, 2012 Posts: 11740 Location: Redding, CA
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Posted: Sun Jun 13, 2021 11:49 pm Post subject: Re: PICT 34 volume control screw question |
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I wrote Tim awhile back, about a volume control o-ring that seemed a bit stiff—like it was dry, and the screw didn’t move as easily as it once did. He told me to just grease the o-ring. Doh! Captain Obcious to themrescie .
Once the o-ring is lubed, you should be able to feel the real resistance of the screw as it bottoms out.
Tim _________________ Let's do the Time Warp again!
Richard O'Brien |
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