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SantaCruzMike
Samba Member
Joined: October 19, 2015
Posts: 10
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 Posted: Thu Dec 19, 2019 6:47 pm Post subject: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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After installing a nice used engine in my 67 bus, I realized the flywheel on it was 6 volt. Obviously, with a 67, I have a 12 volt transmission.
The bus runs great with the replacement engine, but the 12v starter screeches like a banshee, and would soon be destroyed by a 6v flywheel.
I do, however, have a 6 volt starter. Would one of the following work, at least until the next time I pull the engine?
A. Install the 6 volt starter with no bushing and run the dang thing?
B. Have a machinist reduce the diameter of the 6volt starter shaft where it goes into the transmission so that it fits inside of a 12volt starter bushing?
Also wondering if I will have to change the clutch along with the flywheel?
Here are two photos: one of the new clutch and 6 volt flywheel that I installed, and one of the old 12volt clutch and flywheel in a dark corner of the shed...
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Busstom
Samba Member
Joined: November 23, 2014
Posts: 3853
Location: San Jose, CA
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| Posted: Thu Dec 19, 2019 6:57 pm Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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| SantaCruzMike wrote: |
After installing a nice used engine in my 67 bus, I realized the flywheel on it was 6 volt. Obviously, with a 67, I have a 12 volt transmission.
The bus runs great with the replacement engine, but the 12v starter screeches like a banshee, and would soon be destroyed by a 6v flywheel.
I do, however, have a 6 volt starter. Would one of the following work, at least until the next time I pull the engine?
A. Install the 6 volt starter with no bushing and run the dang thing?
B. Have a machinist reduce the diameter of the 6volt starter shaft where it goes into the transmission so that it fits inside of a 12volt starter bushing?
Also wondering if I will have to change the clutch along with the flywheel?
Here are two photos: one of the new clutch and 6 volt flywheel that I installed, and one of the old 12volt clutch and flywheel in a dark corner of the shed... |
The trans doesn't care which FW you run...and the starter will chew the FW, not the other way around. And don't run a 6V starter in the 12V bushing!
Pull the engine back out, because as you know, it's EXTREMELY SIMPLE, and change the starter bushing to a 6V version if you're set on using the FW and not mucking around with setting end play on the 12V replacement FW. The starter will whine a bit and spin faster, but it will probably last a while. Really should just swap the FW and seal, re-set the end play, and run the proper starter/flywheel, done.
Oh, and yes, if all is typical, you WILL need a 200mm pressure plate and clutch disc. |
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earlywesty
Samba Member
Joined: May 03, 2004
Posts: 2358
Location: In the woods, Ontario
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| Posted: Thu Dec 19, 2019 7:04 pm Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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| You could tap the 12v bushing and pull it out and tap a 6v bushing in. Then run the 6v starter on 12v. It wont be fun in the bus though. Should really just pull the motor and fix it right likely. |
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SantaCruzMike
Samba Member
Joined: October 19, 2015
Posts: 10
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| Posted: Thu Dec 19, 2019 7:12 pm Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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| To be clear, I have a 12 volt transmission. So, I can't put a 6volt bushing in it without boring out the bushing hole to a larger size. |
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earlywesty
Samba Member
Joined: May 03, 2004
Posts: 2358
Location: In the woods, Ontario
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| Posted: Thu Dec 19, 2019 7:25 pm Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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| SantaCruzMike wrote: |
| To be clear, I have a 12 volt transmission. So, I can't put a 6volt bushing in it without boring out the bushing hole to a larger size. |
I think the hole is the same size, bushings are different inner diameter? Either way, ypu know what to do... |
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hazetguy
Samba Member
Joined: April 06, 2001
Posts: 10773
Location: iT StiNgeD iTseLf tO dEAd
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| Posted: Thu Dec 19, 2019 7:36 pm Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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| buseric wrote: |
| SantaCruzMike wrote: |
| To be clear, I have a 12 volt transmission. So, I can't put a 6volt bushing in it without boring out the bushing hole to a larger size. |
I think the hole is the same size, bushings are different inner diameter? Either way, ypu know what to do... |
The bore is not the same size in the transmission case between 6v and 12v.
Op, you need to get a "12 to 6" bushing. They are thin and can be tricky to install, but that's what you need (as well as a 6v starter).
Upper right in this pic: https://www.thesamba.com/vw/forum/album_page.php?pic_id=323827 |
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SantaCruzMike
Samba Member
Joined: October 19, 2015
Posts: 10
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| Posted: Thu Dec 19, 2019 7:42 pm Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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Wow, I didn't know a "12 to 6" existed. I have a six volt starter, so it looks like the super thin "12 to 6" is all I need.
I'm sure they are delicate to install! I've cracked a standard 12 volt bushing (lower left) while trying to install it. The "12 to 6" (upper right) is even thinner.
https://www.thesamba.com/vw/gallery/pix/323827.jpg |
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earlywesty
Samba Member
Joined: May 03, 2004
Posts: 2358
Location: In the woods, Ontario
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| Posted: Thu Dec 19, 2019 7:42 pm Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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| Thanks fornthe clarification jon. |
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hazetguy
Samba Member
Joined: April 06, 2001
Posts: 10773
Location: iT StiNgeD iTseLf tO dEAd
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| Posted: Thu Dec 19, 2019 7:50 pm Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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Empi makes the bushings, probably others do too. There are several in the classifieds right now. Yes, they are thin and sorta delicate. Order 2 in case you damage one when installing it (or to have as a spare, they tend to wear more rapidly than other bushings).
Using a fully supported installing tool/bushing driver (one that fits inside the bushing while driving it in) helps a lot. A "regular" 6v bushing installer works.
Also, use sufficient grease on the starter shaft and bushing to help prevent wear.
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Wayne S. Johnson
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Joined: April 12, 2006
Posts: 1265
Location: GILROY, CA
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Wayne S. Johnson
Samba Member
Joined: April 12, 2006
Posts: 1265
Location: GILROY, CA
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| Posted: Thu Dec 19, 2019 8:00 pm Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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| buseric wrote: |
| You could tap the 12v bushing and pull it out and tap a 6v bushing in. Then run the 6v starter on 12v. It wont be fun in the bus though. Should really just pull the motor and fix it right likely. |
Not fun for the flywheel, starter or you when the tow truck bill is more than a Hybrid starter.
Flywheel after running a 6V starter on 12V.
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Last edited by Wayne S. Johnson on Fri Dec 20, 2019 1:09 am; edited 1 time in total |
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Eric&Barb
Samba Member
Joined: September 19, 2004
Posts: 24764
Location: Olympia Wash Rinse & Repeat
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| Posted: Thu Dec 19, 2019 8:02 pm Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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One can also bush the 6 volt starter gear to fit on the 12 volt starter shaft.
Big problem is if the 6 volt FW is the 180 clutch type and the engine is much bigger than a 1200cc the clutch will not last long.
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Busstom
Samba Member
Joined: November 23, 2014
Posts: 3853
Location: San Jose, CA
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| Posted: Thu Dec 19, 2019 8:04 pm Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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| hazetguy wrote: |
| buseric wrote: |
| SantaCruzMike wrote: |
| To be clear, I have a 12 volt transmission. So, I can't put a 6volt bushing in it without boring out the bushing hole to a larger size. |
I think the hole is the same size, bushings are different inner diameter? Either way, ypu know what to do... |
The bore is not the same size in the transmission case between 6v and 12v.
Op, you need to get a "12 to 6" bushing. They are thin and can be tricky to install, but that's what you need (as well as a 6v starter).
Upper right in this pic: https://www.thesamba.com/vw/forum/album_page.php?pic_id=323827 |
I had no idea, either...I've only done 6 to 12's, so I always ASSumed the ID was the only difference.  |
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SantaCruzMike
Samba Member
Joined: October 19, 2015
Posts: 10
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| Posted: Thu Dec 19, 2019 8:21 pm Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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Thanks Hazetguy!
Super helpful. |
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npbusguy
Samba Member
Joined: February 08, 2006
Posts: 1658
Location: Budapest, Hungary
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gears
Samba Member
Joined: October 28, 2002
Posts: 4391
Location: Tamarack, Bend, Kailua
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| Posted: Sun Dec 22, 2019 10:41 am Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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I'm surprised no one's suggested installing a 12V solenoid on your 6V starter. Your "accident" was one of my favorite mods (for high compression engines) .. but retaining the 6V solenoid will ruin your flywheel teeth.
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thom
Samba Member
Joined: October 12, 2000
Posts: 5943
Location: Sacramento
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| Posted: Sun Dec 22, 2019 11:50 am Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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I ran a 6v starter in my 12v panel for 20 years without any problems
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Clara 
Samba Member
Joined: June 14, 2003
Posts: 12401
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| Posted: Mon Dec 23, 2019 11:05 am Post subject: Re: Accidentally put a 6v flywheel in my 67 bus. Any way to run it? |
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looks like it has the big clutch so good there.
There is a new starter that works on 12V or 6V FWs. It was in a 55 truck I bought which was 12V and had a 6V big clutch FW with a 12V tranny and 12V system. Not sure how it worked, but it did. I swapped a 12V FW onto that engine, and kept the 6V one for a different bus. I bought another starter just like it at Autozone. Short, which is nice. |
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