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Registered User
Join Date: Feb 2011
Location: lincoln nebraska
Posts: 128
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Broken Zenith Idle Mixture Screw
I am new to Pelican and I have a shiny new 75 Targa W/ a 2.2T
I am in the process of rebuilding the Zenith 40 Tins. I have broken off the Idle mixture control screws in the body of the carb.  Dose any body have any idea how to get the broken piece out? any help will be greatly appreciated. 911 2.2T |
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03-12-2011, 07:50 PM
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Registered User
Join Date: Feb 2011
Location: lincoln nebraska
Posts: 128
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No I had the screw out then sprayed with carb cleaner, then screwed it back in and it broke whare the "O" ring fits on.I can't grab it with any thing but there is some of the screw up mabye an 1/8 above the threads.Inside the hole
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03-12-2011, 08:18 PM
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Home of the Whopper
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Since it was loose at one point, a reverse drill bit may work. Or a small easy out from Sears.
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1968 912 coupe 1971 911E Targa rustbucket 1972 914 1.7 1987 924S |
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03-13-2011, 05:20 AM
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Registered
Join Date: May 2002
Location: Wisconsin
Posts: 739
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I've had the same issue a couple of times before. In my experience the part of the screw that remained in the carb body was not very tightly engaged. The trick to removing was to apply just enough pressure with a small reverse drill to get it to turn, but to avoid putting so much pressure on it that the thread friction works against you. You'll be amazed at how easily the stump turns after you figure out how to grip it.
The hardest part will be to find a replacement screw ...
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1977 911S 1973 Alfa Romeo GT Veloce 1997 Lotus Turbo Esprit V8 2016 AMG C63S |
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03-13-2011, 06:27 AM
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Home of the Whopper
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I have a couple of zeniths that I have pulled parts from. I am sure I have a couple of those screws.
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1968 912 coupe 1971 911E Targa rustbucket 1972 914 1.7 1987 924S |
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03-13-2011, 06:31 AM
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Registered User
Join Date: Feb 2011
Location: lincoln nebraska
Posts: 128
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On my way to sears i'll keep you posted.
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03-13-2011, 07:58 AM
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Registered User
Join Date: Feb 2011
Location: lincoln nebraska
Posts: 128
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On a simmilar note, the rebuild kit I bought came with the wrong size "O"ring for the idle mixture screw. Any idea whare to sorce this part?
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03-13-2011, 08:02 AM
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Registered User
Join Date: Feb 2011
Location: lincoln nebraska
Posts: 128
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On my way to Sears. also I need the "O"Rings that go with the idle screws "6". The ones that came with the rebuild kit are to big and I don't know Ware to get them?
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03-13-2011, 08:42 AM
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Registered User
Join Date: Feb 2011
Location: lincoln nebraska
Posts: 128
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no luck. now just half of the remaining shaft is broken off...
What can be done??? Should I try to drill out the hole? What size? what about the threads??? I need help!!! |
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03-13-2011, 10:16 AM
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Home of the Whopper
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They are made from very hard steel, almost tool grade. You will not have any luck drilling out. A machine shop may.
I recently did this on a set of webers. Not fun. A machine shop ended up drilling out but ruined the threads. I used metal putty to fill in the hole, drilled and tapped it. Worked out good for me. Your results may vary! If you arent comfortable you may want to send out to have somebody do it for you.
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1968 912 coupe 1971 911E Targa rustbucket 1972 914 1.7 1987 924S |
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03-13-2011, 01:10 PM
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Registered
Join Date: Mar 2004
Location: Windsor, CT
Posts: 2,119
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Mcmaster carr sells metric orings. You should be able to match the old ones. I forgot the sizes i used. But look fo the id to be smaller than the shaft groove diameter and the installed diameter to be larger than the hole that it fits into.
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03-13-2011, 02:50 PM
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Registered User
Join Date: Feb 2011
Location: lincoln nebraska
Posts: 128
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Good news. I drilled out the inside of what was left inside and taped a small piece of an allen wrench and got it out...
Every thing looks good inside. I had an extra idle screw to replace the broken one. Now the "O"rings that came with the rebuild kit are to big. Any ideas Ware to get a smaller ones? Thanks everybody for the help. |
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03-13-2011, 03:17 PM
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Registered
Join Date: Mar 2004
Location: Windsor, CT
Posts: 2,119
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Mike '82 911SC, SSI, 22/29 tbars, 22F/22R Adj swaybars, Bilstein Sport, Elephant polybronze & monoballs, Cambermeister bar, turbo tierods, Carrera oil cooler, front brake cooling ducts, Sparco Sprint 5 & Recaro SRD PAX seat, Teamtech harness, DAS Sport rollbar. |
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03-13-2011, 04:13 PM
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Olive
The Turtle
Ruby
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