Vac Advance can replacement
Thread Starter
Team Owner
Joined: Jun 2001
Posts: 23,375
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From: Virginia USA
Vac Advance can replacement
The vac advance can on my MSD 8572 Tach drive distributor has failed, won't hold vacuum verified with my mity-vac. Has anyone been able to replace it without removing the distributor or is it even possible. It's just two allen head screw with a Jesus clip. Really simple but I don't think I'll be able to get the shaft out it's hole.
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Yes, its swappable still on the car. Don't make more work for yourself stabbing the dizzy, setting the timing, etc.
However, take a big bath towel and place it around the entire dist. Have a magnet on a stick ready if you need it for lost screws.
I believe once the canisters screws are removed, you have to tilt the canister unit to clear the rod.
Pretty easy stuff.
All the better if it's up on ramps, closer to you. Save your back.
However, take a big bath towel and place it around the entire dist. Have a magnet on a stick ready if you need it for lost screws.
I believe once the canisters screws are removed, you have to tilt the canister unit to clear the rod.
Pretty easy stuff.
All the better if it's up on ramps, closer to you. Save your back.
Thread Starter
Team Owner
Joined: Jun 2001
Posts: 23,375
Likes: 1,066
From: Virginia USA
Yes, its swappable still on the car. Don't make more work for yourself stabbing the dizzy, setting the timing, etc.
Yes, I just looked at it closer and the shaft on the cans can move up and down a lot so I shouldn't have an issue getting the old one off.
The one that's on there is a B26. I have a B1 in my Box-O-Stuff. I e-mailed our Guru Lars to see what he thinks I should run on my mostly stock ZZ4 crate engine. I think the B1 should be fine.
These are the spec according to Lars paper:
B1 - Starts @ 8-11 Max = 8 @ 16
B26 - Starts @ 5-7 Max = 8 @ 11-13
Last edited by theandies; Aug 23, 2024 at 10:25 AM.
Tech Contributor
Joined: Aug 1999
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From: At my Bar drinking and wrenching in Lafayette Colorado
Don't use the B1 - it is completely unsuitable for your application and does not meet the requirements of "The 2-Inch Rule." No - It will not be fine - it's junk. Install a B26.
Lars
Lars
Burning Brakes
Joined: Apr 2020
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From: Western NY
If you can not get it out the way described above then you can use snap ring pliers to open the snap ring that holds the breaker plate/ magnetic pick up plate down and lift it up to give clearance to remove the vac canister then reverse the process. this will work for sure.
Pat
Pat
Thread Starter
Team Owner
Joined: Jun 2001
Posts: 23,375
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From: Virginia USA
If you can not get it out the way described above then you can use snap ring pliers to open the snap ring that holds the breaker plate/ magnetic pick up plate down and lift it up to give clearance to remove the vac canister then reverse the process. this will work for sure.
Pat
Pat
Is my vette stock?? HAHA
Joined: Oct 2015
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From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
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Dont foirget to put some rags over your carb in case something flies into the air....alwasys a bad feeling with the air cleaner off
