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Mpec2
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Joined: May 24, 2015
Posts: 45
Location: Chicago, IL
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 Posted: Sat Apr 20, 2024 3:22 pm Post subject: 1.7L Type 4 Original Case, what is this bolt for? |
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Can someone tell me what the bolt is for that is between the cylinder 1 lifters? Is it part of the oil relief system?
This is off of a 1.7L VW Bus engine, original case marked CB.
Don't mind the dirty case, its gotten cleaned since i took the picture 
Thanks
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timvw7476
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Joined: June 03, 2013
Posts: 2205
Location: seattle
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| Posted: Sat Apr 20, 2024 3:26 pm Post subject: Re: 1.7L Type 4 Original Case, what is this bolt for? |
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present on the dual-carb 1800 '74 case as well.
It's part of the internal oil pressure relief/regulation system. |
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Mpec2
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Joined: May 24, 2015
Posts: 45
Location: Chicago, IL
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| Posted: Sat Apr 20, 2024 3:29 pm Post subject: Re: 1.7L Type 4 Original Case, what is this bolt for? |
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Ahh thank you.
Is there a part number associated?
I want to make sure all its components are there. Is there a spring and some sort of relief valve behind it? |
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busdaddy
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Joined: February 12, 2004
Posts: 51146
Location: Surrey B.C. Canada, but thinking of Ukraine
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Mpec2
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Joined: May 24, 2015
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Location: Chicago, IL
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Clatter
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Joined: September 24, 2003
Posts: 7544
Location: Santa Cruz
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| Posted: Sat Apr 20, 2024 7:02 pm Post subject: Re: 1.7L Type 4 Original Case, what is this bolt for? |
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FWIW,
3/8” drive ratchet fits the plug perfectly.
_________________
Bus Motor Build
What’s That Noise?!? |
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Mpec2
Samba Member
Joined: May 24, 2015
Posts: 45
Location: Chicago, IL
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| Posted: Sun Apr 21, 2024 7:59 am Post subject: Re: 1.7L Type 4 Original Case, what is this bolt for? |
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Hmmm meaning it fits inside the bore where the piston would otherwise go?
I thought i found the part number (021115411A) but they seem to all be the 16mm pistons that go into the larger oil pressure relief valve found at the bottom of the case.
When i measure this control valve bore between these cylinder 1, its more like 12mm. So now im back to square one.
Anyone happen to know where these pistons can be found?
I have the triple square bolt and the spring, but that relief piston is missing in there. Might have rolled off somewhere when i moved things around  |
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raygreenwood
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Joined: November 24, 2008
Posts: 21519
Location: Oklahoma City
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| Posted: Sun Apr 21, 2024 11:49 am Post subject: Re: 1.7L Type 4 Original Case, what is this bolt for? |
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| Mpec2 wrote: |
Hmmm meaning it fits inside the bore where the piston would otherwise go?
I thought i found the part number (021115411A) but they seem to all be the 16mm pistons that go into the larger oil pressure relief valve found at the bottom of the case.
When i measure this control valve bore between these cylinder 1, its more like 12mm. So now im back to square one.
Anyone happen to know where these pistons can be found?
I have the triple square bolt and the spring, but that relief piston is missing in there. Might have rolled off somewhere when i moved things around |
The piston part # is: 021 115 411
The spring part # is : 021 115 421 A
The outer plug part # is: 021 115 431 A
I will see if I have time to measure one. Ray |
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