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bnam
Samba Member
Joined: July 02, 2006
Posts: 2936
Location: El Dorado Hills CA/ Bangalore, India
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 Posted: Fri Jan 19, 2018 9:45 am Post subject: Vacuum hole on base of carb flange |
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I'm rebuilding a 34pict3 carb with #vw527_2 for use on his 73 1600 super. This carb has a hole on the left side of the flange (towards the throttle arm). What is this hole for? What's a good way to plug it?
Byas
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1971 1302LS Convertible (RHD) owned since '74
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1965 Karmann Ghia Coupe - under restoration
1966 Fiat 1500 Cabrio (with 1600 Twin cam)
1952 Citroen TA 11BL |
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bluebus86
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Joined: September 02, 2010
Posts: 11075
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| Posted: Fri Jan 19, 2018 10:15 am Post subject: Re: Vacuum hole on base of carb flange |
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| bnam wrote: |
I'm rebuilding a 34pict3 carb with #vw527_2 for use on his 73 1600 super. This carb has a hole on the left side of the flange (towards the throttle arm). What is this hole for? What's a good way to plug it?
Byas |
Automatic stickshifter cars have a vacuum port just below the throttle plate. this maybe what you are describing. if you still have the metal part number tag on your carb, it will give a clue to what thjs carb was installed on, all 34 pict 3 are not the same. the metal tag affixed to one of the top cover screws will tell you what specifically it was made for, different jets, etc..... the Orange Bentley Official VW Service book has a table in the fuel system section listing the tag numbers and what jets and such are provided. you should read the jet sizes off each jet and compare to the Service book table to find out which carb you have if the tag is missing.
For blocking an unused port, autoparts stores often carry various sized rubber caps for this purpose. ask for a vacuum port cap, use the diameter off yours for correct fit.
good luck, Bug on my fueled up friend!
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Cusser
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Joined: October 02, 2006
Posts: 31380
Location: Hot Arizona
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| Posted: Fri Jan 19, 2018 4:42 pm Post subject: Re: Vacuum hole on base of carb flange |
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| bluebus86 wrote: |
| For blocking an unused port, autoparts stores often carry various sized rubber caps for this purpose. ask for a vacuum port cap, use the diameter off yours for correct fit. |
Get a=the best quality cap you can find, the cheap ones crack and fall off within a year. Or use a short piece of rubber vacuum tubing and a wooden golf tee.
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bnam
Samba Member
Joined: July 02, 2006
Posts: 2936
Location: El Dorado Hills CA/ Bangalore, India
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| Posted: Fri Jan 19, 2018 7:34 pm Post subject: Re: Vacuum hole on base of carb flange |
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This is the hole I am referring to. There is no tube from it to cap. Ideas on how to cap this? Will RTV work?
Byas
_________________
1971 1302LS Convertible (RHD) owned since '74
Click to view image
1965 Karmann Ghia Coupe - under restoration
1966 Fiat 1500 Cabrio (with 1600 Twin cam)
1952 Citroen TA 11BL |
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sleeper bird
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Joined: August 27, 2017
Posts: 119
Location: Louisiana
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| Posted: Sat Jan 20, 2018 5:36 am Post subject: Re: Vacuum hole on base of carb flange |
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| i would drill and tap it for a pipe plug,or if a 1/8 pipe plug is to big,use a bolt with sealant,or an allen screw with sealant would work,if you dont have room for the head of a bolt |
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David_nc_72std
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Joined: August 22, 2015
Posts: 841
Location: Winston-Salem, NC
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| Posted: Sat Jan 20, 2018 6:08 am Post subject: Re: Vacuum hole on base of carb flange |
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| Does that actually lead to any passages in the carburetor? Seems like an odd location for a vacuum port, with the close proximity to the throttle arm. Looks more like a drill passage for the factory that was not used on that particular carb, so it was never capped off. |
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glutamodo 
The Android
Joined: July 13, 2004
Posts: 26325
Location: Douglas, WY
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| Posted: Sat Jan 20, 2018 9:16 am Post subject: Re: Vacuum hole on base of carb flange |
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Never seen that one before. I don't know what the 527_2's original application was, but the 527_1 was non-USA AS-engine 1600 Transporter.
And no, RTV and gasoline do NOT mix. Gasoline causes RTV to break down, swell and fall apart. I'd get some kind of actual threaded plug to put in there.
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Andy T.
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Mikedrevguy
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Joined: October 15, 2008
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Location: Medford, OR
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| Posted: Sat Jan 20, 2018 9:37 am Post subject: Re: Vacuum hole on base of carb flange |
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JB Weld?
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glutamodo
The Android
Joined: July 13, 2004
Posts: 26325
Location: Douglas, WY
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| Posted: Sat Jan 20, 2018 9:52 am Post subject: Re: Vacuum hole on base of carb flange |
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Yeah JB-Weld or PC-7, those would work too.
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Andy T.
IMAGE NOTE: It has been noted that Chrome based browsers may have issues in displaying my vast image library, which use non-secure links and are on an FTP server. Images should still be viewable if the link is clicked though.
I do not know how to fix this. All I can say is it all works fine for me with what I use, Firefox. |
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bnam
Samba Member
Joined: July 02, 2006
Posts: 2936
Location: El Dorado Hills CA/ Bangalore, India
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| Posted: Sat Jan 20, 2018 11:17 am Post subject: Re: Vacuum hole on base of carb flange |
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| glutamodo wrote: |
Never seen that one before. I don't know what the 527_2's original application was, but the 527_1 was non-USA AS-engine 1600 Transporter.
And no, RTV and gasoline do NOT mix. Gasoline causes RTV to break down, swell and fall apart. I'd get some kind of actual threaded plug to put in there. |
Came off a 1600 AF engine on a bus.
_________________
1971 1302LS Convertible (RHD) owned since '74
Click to view image
1965 Karmann Ghia Coupe - under restoration
1966 Fiat 1500 Cabrio (with 1600 Twin cam)
1952 Citroen TA 11BL |
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mascrappo
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Joined: January 11, 2012
Posts: 535
Location: New Mexico
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| Posted: Sun Jan 21, 2018 7:23 am Post subject: Re: Vacuum hole on base of carb flange |
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| Have you tried a BB, if snug lightly tap it in? Also a small piece of lead, say off a tire weight(?), would do the trick too. If you have a friend who hunts and reloads shot shells, they may have a different sized BB that may will fit as well |
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