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#675067 - Thu Sep 02 2010 05:41 PM 235 vacuum advance question
Ferndale53 Offline
Shop Shark
Registered: Sat Jan 10 2009 04:52 PM
Posts: 303
Loc: CT
This is probably a stupid question, but how the heck do I mount the vacuum advance on the distributor?? heres a picture of the vacuum advance I have. I've looked at the shop manual and flipped through Denny's pictures, and still couldn't figure it out. I bought the engine without a advance on it, so I never got to see how it should be.

Vac advance picture
_________________________
1953 Chevy 3600

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#675092 - Thu Sep 02 2010 07:05 PM Re: 235 vacuum advance question [Re: Ferndale53]
tclederman Online
Registered: Tue Sep 18 2001 12:00 PM
Posts: 23450
Loc: Jarvisburg, NC
IInsert the distributor into the assembly and slide the assembly up the distributor post.
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#675096 - Thu Sep 02 2010 07:29 PM Re: 235 vacuum advance question [Re: tclederman]
Ferndale53 Offline
Shop Shark
Registered: Sat Jan 10 2009 04:52 PM
Posts: 303
Loc: CT
Thats exactly what I did, but nothing happens when I put vacuum to the unit. The arm can't be shoved into the advance at all. When I have the unit off the distributor, I can push the plunger in, but it pushes the clamp away from the advance, which than doesn't line up with the hole on the advance.


Edited by Ferndale53 (Thu Sep 02 2010 07:30 PM)
_________________________
1953 Chevy 3600

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#675108 - Thu Sep 02 2010 08:25 PM Re: 235 vacuum advance question [Re: Ferndale53]
tclederman Online
Registered: Tue Sep 18 2001 12:00 PM
Posts: 23450
Loc: Jarvisburg, NC

From whom did you get the advance unit and what is the part number?
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#675118 - Thu Sep 02 2010 09:02 PM Re: 235 vacuum advance question [Re: tclederman]
Ferndale53 Offline
Shop Shark
Registered: Sat Jan 10 2009 04:52 PM
Posts: 303
Loc: CT
I got the advance from classic parts:
http://www.classicparts.com/1947-62-Vacuum-Advance-6-Cylinder/productinfo/83-274/

The clamp doesn't come with it, but I found one in a pile of parts that was with the truck.
_________________________
1953 Chevy 3600

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#675131 - Thu Sep 02 2010 10:05 PM Re: 235 vacuum advance question [Re: Ferndale53]
tclederman Online
Registered: Tue Sep 18 2001 12:00 PM
Posts: 23450
Loc: Jarvisburg, NC

It looks to me that the unit you received is not the unit in the catalog.

Call Classic Parts and tell them you received the wrong part. If that does not work, ask to speak with a technical support person and ask him/her if you may send to them a photo of the unit you received and a photo of the unit you tried to buy.

Would someone else reading these posts look at both photos and give their opinion?

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#675142 - Thu Sep 02 2010 10:23 PM Re: 235 vacuum advance question [Re: tclederman]
bowtietim Offline
Shop Shark
Registered: Thu Dec 08 2005 12:00 PM
Posts: 3277
Loc: Kansas
Looks like the collar is different to me,you might check that.
_________________________
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Look deep before you leep !!!

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My 1951 Chevrolet 3100

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#675156 - Thu Sep 02 2010 10:48 PM Re: 235 vacuum advance question [Re: bowtietim]
Ferndale53 Offline
Shop Shark
Registered: Sat Jan 10 2009 04:52 PM
Posts: 303
Loc: CT
Originally Posted By bowtietim
Looks like the collar is different to me,you might check that.


I think your onto something. The '54 manual shows the curved collar like I have:
http://chevy.oldcarmanualproject.com/shop/1954truck/54ctsm0619.html

But, this thread says that the '54 manual shows the car, not truck vacuum advance

So I have a new truck vacuum advance, but the collar from a car 235.
_________________________
1953 Chevy 3600

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#675160 - Thu Sep 02 2010 11:02 PM Re: 235 vacuum advance question [Re: Ferndale53]
tclederman Online
Registered: Tue Sep 18 2001 12:00 PM
Posts: 23450
Loc: Jarvisburg, NC

The back surface of the "vacuum pot" is not flat on your unit. The back surface of the original pot and the back of the unit in the Classic Parts photo is not the same as on your unit. I have bought two units from Classic Parts and they look like the photo in your catalog, not like the unit your received. I think they sent you the wrong unit.

The collar from a car is different from the collar from a truck but either one will work with the right unit (as long as you bend the vacuum line).
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#675226 - Fri Sep 03 2010 07:56 AM Re: 235 vacuum advance question [Re: tclederman]
hoyt Offline
Shop Shark
Registered: Fri Jun 17 2005 12:00 PM
Posts: 391
Loc: Kirkwood, MO
It looks like the clamp collar might interfere with the hold-down bolt on the octane selector. Maybe a clamp from a truck and a vacuum unit for a car? The entire units can be switched (with re-positioning the vacuum tube), but can the collars be switched?
Hoyt
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