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chamilka Samba Member

Joined: March 18, 2006 Posts: 218 Location: San Diego
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Posted: Wed Feb 12, 2025 5:22 pm Post subject: 1976 Bus engine fitment to a 1975 bus - Update |
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Hello All.
My 1975 bus engine needs to be replaced or rebuilt. It was converted to a dual carburetor system, so it no longer has the original fuel injection. I found a running 1976 bus engine locally at a very affordable price. This engine is a G number engine (GD010785).
I'm wondering if this could be a straightforward direct swap, or if there’s a risk it won’t fit. My plan is to swap the carburetor setup into the 1976 engine.
Thanks
Update :
75 Bus engine code: ED 013508
76 Bus Engine Code: GD 010785
Last edited by chamilka on Mon Feb 24, 2025 6:23 pm; edited 2 times in total |
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germansupplyscott Samba Member

Joined: May 22, 2004 Posts: 7245 Location: toronto
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Posted: Wed Feb 12, 2025 5:29 pm Post subject: Re: 1976 Bus engine fitment to a 1975 bus |
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The engine will fit fine but there will be changes needed to the transmission/clutch to make it work.
Off the top of my head if you swap the flywheel and clutch components from the '75 engine to the '76 engine it should work. I might be forgetting something(s).
You probably will need to do some re-jetting of the carbs, you are going from 1.8l to 2.0l. _________________ SL |
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Wildthings Samba Member

Joined: March 13, 2005 Posts: 52283
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Posted: Wed Feb 12, 2025 8:00 pm Post subject: Re: 1976 Bus engine fitment to a 1975 bus |
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I think the length of the studs that hold the engine and tranny together are different. If you have the bellhousing and starter that goes with the '76 keeping them with the engine would be one way to go. |
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aeromech Samba Member

Joined: January 24, 2006 Posts: 17615 Location: San Diego, California
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Posted: Wed Feb 12, 2025 8:08 pm Post subject: Re: 1976 Bus engine fitment to a 1975 bus |
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Perhaps I’m wrong but in the back of my mind I want to say that I’ve read before that the cam in the fuel injection engine doesn’t play well with carbs. I don’t have any personal experience with this though.
Following up on what Wildthings said, there was a change around 1976 that included a new, longer reach starter gear and matching bell housing. You need to research this. Longer studs would be the least of your concerns because they can easily be installed or removed. _________________ Lead Mechanic: San Diego Air and Space Museum
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Capable of leaping tall buildings in a single bound |
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germansupplyscott Samba Member

Joined: May 22, 2004 Posts: 7245 Location: toronto
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Posted: Wed Feb 12, 2025 9:53 pm Post subject: Re: 1976 Bus engine fitment to a 1975 bus |
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Wildthings wrote: |
I think the length of the studs that hold the engine and tranny together are different. If you have the bellhousing and starter that goes with the '76 keeping them with the engine would be one way to go. |
Yes, good catch. Swap lower studs from old engine to new. '76 engine lower studs are quite a bit longer. _________________ SL |
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germansupplyscott Samba Member

Joined: May 22, 2004 Posts: 7245 Location: toronto
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Posted: Wed Feb 12, 2025 9:57 pm Post subject: Re: 1976 Bus engine fitment to a 1975 bus |
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aeromech wrote: |
Perhaps I’m wrong but in the back of my mind I want to say that I’ve read before that the cam in the fuel injection engine doesn’t play well with carbs. I don’t have any personal experience with this though.
Following up on what Wildthings said, there was a change around 1976 that included a new, longer reach starter gear and matching bell housing. You need to research this. Longer studs would be the least of your concerns because they can easily be installed or removed. |
The starter from the '75 will work as long as the flywheel is swapped. The 2.0 engine was paired with the 091 trans and a lot of differences, but swapping just the engine should be relatively straightforward.
Carbs-cam compatibility - probably an issue but OP is already doing this with a '75 engine (was FI) converted to carbs. It's probably not a big issue if all you need is to make the Bus drive. Might not be optimal for performance, fuel economy. _________________ SL |
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timvw7476 Samba Member
Joined: June 03, 2013 Posts: 2479 Location: seattle
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Posted: Wed Feb 12, 2025 10:02 pm Post subject: Re: 1976 Bus engine fitment to a 1975 bus |
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aeromech wrote: |
Perhaps I’m wrong but in the back of my mind I want to say that I’ve read before that the cam in the fuel injection engine doesn’t play well with carbs. I don’t have any personal experience with this though.
Following up on what Wildthings said, there was a change around 1976 that included a new, longer reach starter gear and matching bell housing. You need to research this. Longer studs would be the least of your concerns because they can easily be installed or removed. |
am running a 2.0L '76 GD code with 34 ICT Webers. It's about 75-77mph top speed, 23 mpg unloaded & driving to infuriate any one behind me.......
It does have the head shims & the dished pistons, 091 gearbox. Idles fine, revs like a 71mm crankshaft should. (slow). Those tiny intake valves & restrictive exhaust keep the torque right where VW wanted it, but the top end revs are non0existent as VW intended. The 2.0L heads are really that bad. Been 39k miles. I'm fine with it,. Over a decade & no speeding tickets! : ) |
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chamilka Samba Member

Joined: March 18, 2006 Posts: 218 Location: San Diego
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Posted: Mon Feb 24, 2025 6:24 pm Post subject: Re: 1976 Bus engine fitment to a 1975 bus - Update |
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Hi all,
thank you for your comments. I consolidated your comment (in " "). I am trying to make sure I clarify eveythign before I get the engine. please answer my questions and I really appreciate your time on this.
flywheel , pressure plate, Bellhouse , starter & transmission:
-----------------------------------------------------------
"might require to swap the flywheel and clutch components from the '76 engine to the '75 engine " - the 76 engine comes with flywheel and Pressure plate but not the clutch disc, I can buy a clutch disc for $120.
"If you have the bellhousing and starter that goes with the '76 keeping them with the engine would be one way to go"
"The 1976 2.0 engine was paired with the 091 trans and a lot of differences",
I do not have the Bellhouse or the stater from the 76 bus. I can buy a 76 starter from Jbug if needed which is bout $400, but not the bell housing
Somebody also mentioned that "The starter from the '75 will work as long as the flywheel is swapped.",
qn: I assume I don't need a 76 transmission as long as I have stater and flywheel from the 76 bus right? Do I still need the bellhousing from the 76 bus?
VW Lower Engine Case Mounting Studs:
- "length of the studs that hold the engine and tranny together are different. "
- "Swap lower studs from old engine to new. '76 engine lower studs are quite a bit longer.?"
The 76 engine will not come with the studs but I can buy them from Jbugs $10 per each.
ECU for the FI L-Jetronic
my 75 bus, although converted to dual carbs, still has the ECU in the original location still intact. the 76 bus come with the FI wiring harness but without the ECU. I don't think 76 engine will work with 75 ecu right? |
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Wildthings Samba Member

Joined: March 13, 2005 Posts: 52283
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Posted: Mon Feb 24, 2025 8:53 pm Post subject: Re: 1976 Bus engine fitment to a 1975 bus - Update |
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chamilka wrote: |
Hi all,
thank you for your comments. I consolidated your comment (in " "). I am trying to make sure I clarify eveythign before I get the engine. please answer my questions and I really appreciate your time on this.
flywheel , pressure plate, Bellhouse , starter & transmission:
-----------------------------------------------------------
"might require to swap the flywheel and clutch components from the '76 engine to the '75 engine " - the 76 engine comes with flywheel and Pressure plate but not the clutch disc, I can buy a clutch disc for $120.
"If you have the bellhousing and starter that goes with the '76 keeping them with the engine would be one way to go"
"The 1976 2.0 engine was paired with the 091 trans and a lot of differences",
I do not have the Bellhouse or the stater from the 76 bus. I can buy a 76 starter from Jbug if needed which is bout $400, but not the bell housing
Somebody also mentioned that "The starter from the '75 will work as long as the flywheel is swapped.",
qn: I assume I don't need a 76 transmission as long as I have stater and flywheel from the 76 bus right? Do I still need the bellhousing from the 76 bus?
VW Lower Engine Case Mounting Studs:
- "length of the studs that hold the engine and tranny together are different. "
- "Swap lower studs from old engine to new. '76 engine lower studs are quite a bit longer.?"
The 76 engine will not come with the studs but I can buy them from Jbugs $10 per each.
ECU for the FI L-Jetronic
my 75 bus, although converted to dual carbs, still has the ECU in the original location still intact. the 76 bus come with the FI wiring harness but without the ECU. I don't think 76 engine will work with 75 ecu right? |
Mixing clutch, starter, and bellhousing doesn't always work out. Best to stick to all 1975 parts or all 1976 parts. |
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lil-jinx Samba Member
Joined: August 14, 2013 Posts: 1560 Location: New Brunswick,Canada
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airschooled Air-Schooled

Joined: April 04, 2012 Posts: 13470 Location: West Coast, USA
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Posted: Tue Feb 25, 2025 12:00 pm Post subject: Re: 1976 Bus engine fitment to a 1975 bus - Update |
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lil-jinx wrote: |
when you swap to carbs,will you be able to get it smog /emission passed in ca |
Yes. '75 is exempt, '76 is not.
Don't need to worry about the ECU either. Almost all FI parts are compatible, (except some '79 CA electronics,) as long as the number of pins on your AFM matches the number of pins in the wiring harness plug.
Robbie _________________ One-on-one tech help for your vintage Volkswagen:
www.airschooled.com
https://www.patreon.com/airschooled |
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lil-jinx Samba Member
Joined: August 14, 2013 Posts: 1560 Location: New Brunswick,Canada
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airschooled Air-Schooled

Joined: April 04, 2012 Posts: 13470 Location: West Coast, USA
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Posted: Tue Feb 25, 2025 1:09 pm Post subject: Re: 1976 Bus engine fitment to a 1975 bus - Update |
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lil-jinx wrote: |
thanks ,i was thinking that 74 was the cut off, |
Common confusion, the Clean Air Act mandated catalytic converters on many cars starting in 1975, and our Governator arbitrarily stopped the 30-year rolling exemption with 1976 vehicles in 2006.
Robbie _________________ One-on-one tech help for your vintage Volkswagen:
www.airschooled.com
https://www.patreon.com/airschooled |
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