Airhead crank removal - BMW Luxury Touring Community
 
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post #1 of 9 Old Jun 22nd, 2014, 2:02 pm Thread Starter
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Location: Belen, NM, USA
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Airhead crank removal

I am stuck. I am trying to remove the crankshaft from a 1983 R80 and it won't come out. I have removed everything... the rods, bearing carrier, oil pump, cam, etc. What am I missing? Hints would be appreciated.

1970 BSA 441
1979 Yamaha 350 Exciter
1952 Ariel 350 Red Hunter
1946 Ariel 500 Red Hunter
1949 Velocette 350
1950 AJS 500
2001 Harley Softtail
2004 BMW R1150rt
2006 883 Sportster
2007 Vstar 1100

another 2004 RT
1972 Moto Guzzi Eldorado
1969 Moto Guzzi 750
1970 Moto Guzzi 750
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post #2 of 9 Old Jun 22nd, 2014, 5:55 pm
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Re: Airhead crank removal

I passed your problem on to my son on the MOA web site with the idea that he might be able to help. He is quite knowledgeable on airheads. Here is his reply:

Actually I wouldn't know what to do...never having been that far. I've looked at my Haynes manual and it seems he's removed just about everything your supposed to. I can't tell from his description if it won't move at all or not. The manual says to turn the shaft front bobweight to the top and pull the first journal clear of the case. Then rotate the shaft 180 degrees so the rear bobweight is at the top and withdraw the shaft completely. I have the BMW shop manual for my /7 and it says basically the same thing.

Best of luck, Bob
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post #3 of 9 Old Jun 23rd, 2014, 3:40 am Thread Starter
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Re: Airhead crank removal

I have done everything. I turned the crank as the books suggest, but still nothing. Is there anyone with first hand experience?

1970 BSA 441
1979 Yamaha 350 Exciter
1952 Ariel 350 Red Hunter
1946 Ariel 500 Red Hunter
1949 Velocette 350
1950 AJS 500
2001 Harley Softtail
2004 BMW R1150rt
2006 883 Sportster
2007 Vstar 1100

another 2004 RT
1972 Moto Guzzi Eldorado
1969 Moto Guzzi 750
1970 Moto Guzzi 750
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post #4 of 9 Old Jun 23rd, 2014, 7:51 am
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Re: Airhead crank removal

Have you tried posting your question on the Airhead Forum on the BMWMOA website? There might be some help there.

Bob
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post #5 of 9 Old Jun 23rd, 2014, 3:04 pm Thread Starter
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Re: Airhead crank removal

I can't see paying $40 to join the BMWMOA when I am a Moto Guzzi man. Surely there must bee someone who has torn apart an airhead...

1970 BSA 441
1979 Yamaha 350 Exciter
1952 Ariel 350 Red Hunter
1946 Ariel 500 Red Hunter
1949 Velocette 350
1950 AJS 500
2001 Harley Softtail
2004 BMW R1150rt
2006 883 Sportster
2007 Vstar 1100

another 2004 RT
1972 Moto Guzzi Eldorado
1969 Moto Guzzi 750
1970 Moto Guzzi 750
radarcarve is offline  
post #6 of 9 Old Jun 23rd, 2014, 3:56 pm
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Re: Airhead crank removal

My son passed along this suggestion for possibly getting some help: "I'm sure there are lots of people who have torn an Airhead apart. But you have to admit, probably not that many on the LT forum. Tell him to register on ADVRider. It's free and there's an Airhead section. Or he could register for the Airhead mailing list (at micapeak.com) and pose his question to the likes of Snowbum, Tom Cutter, Ted Porter, and Anton Largiader."


Hope this helps, Bob
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post #7 of 9 Old Jun 23rd, 2014, 5:23 pm
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Re: Airhead crank removal

My son found this YouTube video that may help: https://www.youtube.com/watch?v=hVfUDx5rBHI.

Have a look see, Bob
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post #8 of 9 Old Jun 24th, 2014, 6:27 pm Thread Starter
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Re: Airhead crank removal

Ok... got it solved. I posted on ADVrider and found someone who had the answers. Here is my reply to him on the forum...
Bill... Thanks! You have pulled me out of the confusion. As you surely know, one can never be sure about something until you learn out how to take it apart. I studied the crank end, often with a flashlight, for I knew that there was something holding it in, that I couldn't recognize. It is not apparent at all, for the guide ring looks to be just the end of the crank. But, I could see a bit of a lip under the ring that would obviously hold the crank in place and that had me confused. I ordered the guide ring puller. I am not a BMW man at this point, but, one can never have a tool that isn't valuable, especially since I have 3 R80-100 engines to tear down. Actually, the guide ring puller is primarily for removing the ring prior to replacing the main seal (I am sure you know this). I removed the seal with the guide ring in place, but I know how to do that from years of experience. I have personally rebuilt 1,800 VW, and 825 Porsche engines, and so I know my way around a block (or at least I thought I did). I love the design of BMWs, which originated about the same time as Ferdinand Porsche developed (and influenced) the horizontally opposed engine in 1922-23. I am a Moto Guzzi man now, primarily because I love the automotive influenced design, and the ease of working on them. I have /had 10 loopframes, 1968-73, and it is my touring bike now. Once again, thanks. It is a pleasure to meet someone who knows their way through the obstacles. Lee Davis

1970 BSA 441
1979 Yamaha 350 Exciter
1952 Ariel 350 Red Hunter
1946 Ariel 500 Red Hunter
1949 Velocette 350
1950 AJS 500
2001 Harley Softtail
2004 BMW R1150rt
2006 883 Sportster
2007 Vstar 1100

another 2004 RT
1972 Moto Guzzi Eldorado
1969 Moto Guzzi 750
1970 Moto Guzzi 750
radarcarve is offline  
post #9 of 9 Old Jun 25th, 2014, 7:30 am
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Re: Airhead crank removal

Glad to hear that you were able to get the information you needed on ADVrider.

Bob
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