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10-15-2013, 05:44 PM | #1 |
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Join Date: May 2010
Location: Mesquite, NV / Gurnee, IL
Posts: 298
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Columbia Guys ?
When at a stop light with the car running, my idle speed increases when I depress the clutch. I have traced it to a vacuum leak within the Columbia shift tank. I assume the leather seals are shot. Who makes a good replacement? I have disassembled it already and put some red grease on them but I am still getting the rpm fluctuation.
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10-15-2013, 05:50 PM | #2 |
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Join Date: Jul 2011
Location: SF Bay Area
Posts: 6,644
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Re: Columbia Guys ?
Columbia Two Speed Parts www.columbiatwospeedparts.com
Reproduction Repair Axle Parts and Controls for the Columbia Overdrive Two Speed Axle 1935 - 1948
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10-15-2013, 06:19 PM | #3 |
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Join Date: May 2010
Posts: 410
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Re: Columbia Guys ?
John Connelly @ Columbia 2 speed Parts is a great source. I use Neat's Foot Oil (used to waterproof leather boots) to soften and lube the original leather discs in the shift can. Works well on 40 convert top cylinders too.
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10-15-2013, 08:01 PM | #4 |
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Join Date: May 2010
Location: charlottesville, Va.
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Re: Columbia Guys ?
Make sure your vacumn can is not pitted on the inside. Do not uae grease. Use needsfoot oil on the leather seals. You could also have a vacumn valve leake.
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10-16-2013, 06:54 AM | #5 |
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Join Date: May 2010
Posts: 4,750
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Re: Columbia Guys ?
Beside the diaphragm there is a shaft seal. Not only does the cylinder have to be pit free the shaft has to also.
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10-16-2013, 06:57 AM | #6 |
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Location: Connecticut
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Re: Columbia Guys ?
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10-16-2013, 08:10 AM | #7 |
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Join Date: May 2010
Location: Florida and Penna.
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Re: Columbia Guys ?
The small shaft seal can be bought locally. When it leaks you will usually see rear gear oil in the cylinder. The only thing I found that works on the leathers is MMO. Everything else including neadsfoot oil get gummy and the shift is not crisp. I have 18 Columbia's and tried all types of oils. Make sure you have at least 3/8" ID hoses, fittings and tubing. G.M.
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10-16-2013, 05:08 PM | #8 |
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Posts: 500
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Re: Columbia Guys ?
And I solved my leak problem by using hose clamps at each rubber hose end.
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