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Vacuum Shift Question #403495
02/13/18 11:08 PM
02/13/18 11:08 PM
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NC usa
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41specialdeluxe Offline OP

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I need to replace the vacuum cylinder on my 41 coupe. I think the guts are worn out. It jumps out of gear, etc and I have worked on it before. I have a NOS one that I can put in so that's no problem. The rubber bushings where it attaches to the bracket are toast. What I need to know is how thick each of them need to be and whether I cam make some out of something like maybe struct or ßhock bushings.

Seems they need to be about 5/16 inch or so thick. Maybe less. Don't know.

If any of you have made up replacement rubber bushings please let me know how your method worked.

The reason I posted this here is because the issue is the same through more than one forum.

Thanks a heap,

Charlie computer

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Re: Vacuum Shift Question [Re: 41specialdeluxe] #403496
02/13/18 11:39 PM
02/13/18 11:39 PM
Joined: Jan 2002
Posts: 25,143
West Allis,Wi.
Chev Nut Offline

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Check parts book in group 4.046, part number cushion, 2 used , part # 3650270, demensions are 3/8" id, 1 1/4" od, 7/16 " thick.


Chevgene
Re: Vacuum Shift Question [Re: Chev Nut] #403515
02/14/18 02:26 PM
02/14/18 02:26 PM
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Thanks, Gene. Thats the information I needed.

I wonder if either if Steele makes them.

Thanks again,
Charlie computer

Re: Vacuum Shift Question [Re: 41specialdeluxe] #403551
02/15/18 09:58 AM
02/15/18 09:58 AM
Joined: May 2002
Posts: 1,021
N.S.W.,Australia.
CJP'S 29 Offline
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If they don't make them,get some machined up out of semi-hard,but machineable polyurethane solid rod.


CJP'S 29
Re: Vacuum Shift Question [Re: 41specialdeluxe] #403575
02/15/18 10:46 PM
02/15/18 10:46 PM
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CJP'S,

Sorry, we don't have any of that sort of thing up here. At 83 I'm quite familiar with the term semi-hard rod but that machinable polyurethane stuff is a mystery to me. Maybe I'll just go to the store and measure the thickness of some auto floor mats and sacrifice one of them if I can find a suitable one and can find a circular punch cutter thingee. Maybe I can use some garden hose gaskets. Hmmm.

Thanks for the suggestion anyway.

Best,
Charlie computer

Re: Vacuum Shift Question [Re: 41specialdeluxe] #403594
02/16/18 02:58 AM
02/16/18 02:58 AM
Joined: Jun 2007
Posts: 553
Alberta, Canada
canadiantim Offline

Oil Can Mechanic
canadiantim  Offline

Oil Can Mechanic
Joined: Jun 2007
Posts: 553
Alberta, Canada
Heavy truck mud flaps might work well for donor material. I have a couple I've cut chunks out of and whittled parts from over the years. Some farm supply stores sell a conveyor belt type material by the foot as well.


1938 Canadian Pontiac Business Coupe (aka a 1938 Chevy Coupe with Pontiac shaped front sheet metal - almost all Chevy!)
1975 4-speed L82 Vette
Re: Vacuum Shift Question [Re: 41specialdeluxe] #403598
02/16/18 04:29 AM
02/16/18 04:29 AM
Joined: Jan 2009
Posts: 542
PA.
XLVIIdriver Offline

Oil Can Mechanic
XLVIIdriver  Offline

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PA.
Maybe a piece from a junk car/truck tire would be thick enough to work

dick

Re: Vacuum Shift Question [Re: XLVIIdriver] #403618
02/16/18 06:16 PM
02/16/18 06:16 PM
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All good suggestions.

Thanks a heap.

Charlie computer

Re: Vacuum Shift Question [Re: XLVIIdriver] #403619
02/16/18 06:22 PM
02/16/18 06:22 PM
Joined: Dec 2007
Posts: 439
Iowa
Rusty 37 Master Offline
Backyard Mechanic
Rusty 37 Master  Offline
Backyard Mechanic
Joined: Dec 2007
Posts: 439
Iowa
Interesting that this thread would include suggestions about machining parts from a polyurethane rod. I am getting ready to buy some to make bushings for the lever arm shocks on my'37. The rubber parts I have are very deformed after just a couple of years.

There are numerous sources on eBay for the material "DELRIN" which is a brand name for acetal plastic. Many suppliers are selling the drop-off or leftover material from longer rods (black or white). It is not very expensive.


Rusty

VCCA #44680
Re: Vacuum Shift Question [Re: 41specialdeluxe] #403627
02/16/18 11:32 PM
02/16/18 11:32 PM
Joined: May 2002
Posts: 1,021
N.S.W.,Australia.
CJP'S 29 Offline
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"DELRIN" is a very hard non-deforming type of plastic,more suitable for making fixed & rotating bushes.I used to machine it all the time at work making electrical motor cable bushes the steelworks motor repair shop I worked at for 34 years.
Polyurethane is available in quite a few colours,and different hardnesses(I think its hardness is measured in "Duros"?).You may also be able to buy a polyurethane mixing kit in the U.S.(we can here in Australia),make a mold and make your shock absorber bushes any colour(obviously black)or any hardness you want.One trick I picked up,that to machine any polyurethane that was extremely soft was to freeze it in either ice & salt water or dry ice,put it in the lathe and machine it before it defrosted.But you had to be fairly quick if using ordinary ice & salt water.


CJP'S 29

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