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Abscate
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Joined: October 05, 2014
Posts: 22668
Location: NYC/Upstate/ROW
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 Posted: Tue Apr 06, 2021 2:32 am Post subject: Re: 1973 Bus valves |
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A VW engine quickly gets to a bench top manageable weight on a rebuild. My stand got disassembled, like the patriarchy , many moons ago,
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soloyosh
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Joined: February 24, 2021
Posts: 28
Location: LHC, AZ
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| Posted: Wed May 26, 2021 3:59 pm Post subject: Re: 1973 Bus valves |
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We pulled the engine.
It appears the engine has been chewing on head material for a while.
We scored a recently running 2.0L long block from a shop.
We are going to move our carburation over from our engine.
I was going to install a new clutch kit and had a question on that. I noticed the part numbers for a 1.7 clutch and 2.0 clutch are different. Assuming the flywheels are different as well? I also see what appear to be different flywheel diameters available. What’s that all about?
We plan on rebuilding the 1.7 into a 1.8. Aaron bought a book on rebuilding VW engines.
Thanks
Brett and Aaron
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busdaddy
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Joined: February 12, 2004
Posts: 51149
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Wed May 26, 2021 4:15 pm Post subject: Re: 1973 Bus valves |
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| soloyosh wrote: |
| It was running rough. |
No kidding. 
Recycle the flywheel and clutch off the dead engine, measure the disc and get a new one of the same diameter. The 2.0's flywheel will likely not fit your bellhousing and cause starter issues, go with the one you know works.
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Wildthings
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Joined: March 13, 2005
Posts: 50351
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| Posted: Wed May 26, 2021 5:08 pm Post subject: Re: 1973 Bus valves |
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| Someone was driving that engine with their tunes turned up high so they didn't have to listen to knock, knock, knock of the engine melting itself down and beating itself apart. Someone needs to learn how to time an engine and learn to identify engine knock. |
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raygreenwood
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Joined: November 24, 2008
Posts: 21519
Location: Oklahoma City
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| Posted: Wed May 26, 2021 8:26 pm Post subject: Re: 1973 Bus valves |
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And...you can see the logo on the head. It was a factory rebuild. I wonder if that had any bearing.
Ray |
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Wildthings
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| Posted: Wed May 26, 2021 9:19 pm Post subject: Re: 1973 Bus valves |
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| Rod bearings don't tend to handle engine knock all the well, so you are going to want to access the big ends of the rods. What kind of shape are your cam and lifters in? If they are worn really funky, then a full teardown is warranted. |
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soloyosh
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Joined: February 24, 2021
Posts: 28
Location: LHC, AZ
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| Posted: Thu May 27, 2021 6:08 am Post subject: Re: 1973 Bus valves |
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| Wildthings wrote: |
| Rod bearings don't tend to handle engine knock all the well, so you are going to want to access the big ends of the rods. What kind of shape are your cam and lifters in? If they are worn really funky, then a full teardown is warranted. |
This engine will get a full teardown and a step up in bore to a 1.8L. Some of the current cylinders are missing fins.
Goal is to get the bus running under its own power and out of the way with the 2.0L.
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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 12727
Location: on a bike ride somewhere
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| Posted: Fri May 28, 2021 4:17 pm Post subject: Re: 1973 Bus valves |
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| soloyosh wrote: |
We are going to move our carburation over from our engine.
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Are you sure that is a good idea? The pictures disagree… 
Robbie
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orwell84
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Joined: May 14, 2007
Posts: 2539
Location: Plattsburgh, New York
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| Posted: Sat May 29, 2021 5:44 pm Post subject: Re: 1973 Bus valves |
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| I’m trying to figure out how that exhaust valve got buried so deep in the head. It almost looks like the seat is still there and someone machined it that way. |
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busdaddy
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Joined: February 12, 2004
Posts: 51149
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Sat May 29, 2021 7:26 pm Post subject: Re: 1973 Bus valves |
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| orwell84 wrote: |
| I’m trying to figure out how that exhaust valve got buried so deep in the head. It almost looks like the seat is still there and someone machined it that way. |
Well duh!, it was obviously Hephaestus. 
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Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
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Wildthings
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Joined: March 13, 2005
Posts: 50351
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| Posted: Sat May 29, 2021 9:28 pm Post subject: Re: 1973 Bus valves |
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| orwell84 wrote: |
| I’m trying to figure out how that exhaust valve got buried so deep in the head. It almost looks like the seat is still there and someone machined it that way. |
The question is how it made it that long without the valve becoming stuck open and having a collision with a piston.
Last edited by Wildthings on Sun May 30, 2021 4:58 pm; edited 1 time in total |
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Abscate
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Joined: October 05, 2014
Posts: 22668
Location: NYC/Upstate/ROW
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| Posted: Sun May 30, 2021 1:58 am Post subject: Re: 1973 Bus valves |
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| busdaddy wrote: |
| orwell84 wrote: |
| I’m trying to figure out how that exhaust valve got buried so deep in the head. It almost looks like the seat is still there and someone machined it that way. |
Well duh!, it was obviously Hephaestus. |
May he live long and prosper...
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orwell84
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Location: Plattsburgh, New York
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| Posted: Sun May 30, 2021 7:35 pm Post subject: Re: 1973 Bus valves |
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| So that is extreme heat recession? At some point the seat came out and the piston beat the fragments against the cylinder head? I had a piece of debris in one cylinder and it beat up the piston and head like that. It made a huge racket. Turning up the radio wouldn’t have helped. |
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Wildthings
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Joined: March 13, 2005
Posts: 50351
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| Posted: Sun May 30, 2021 8:40 pm Post subject: Re: 1973 Bus valves |
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| I believe the damage here is due to detonation. The piston and head where very close to their melting points and the detonation just blow out big chunks of molten metal as it happened. This would explain the damage around the one exhaust port as well. I am guessing that the engine was built with a very loose deck which caused an echo chamber for the shock waves helping set off each detonation. |
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