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Thread: 1973 R75/5 Back-to-road Project

  1. #166

    Surgery started...

    Quote Originally Posted by 20774 View Post
    Unfortunately, the part number I believe is the same...BMW does that from time to time. But if a dealer has the older bolts in stock, they will sell you those. But you should really ask for the shorter bolts.
    I ordered the shorter flywheel bolts (thanks again for pointing that out) and started disassembling.

    I also ordered Staburags to lube the transmission spline, as recommended by Chris Harris and was wondering if I can use that stuff on the final drive spline as well. My thought was "yes", since the movement on the transmission spline is lateral plus torque and the final drive is torque only and Staburags has the Moly in there. Any opinions on this one?
    Olaf - Austin, TX MOA #200565
    Current bikes: 2012 R1200R Classic, 1973 R75/5 www.R75slash5.com, 1969 CT 70 (108 cc engine)

  2. #167
    Liaison 20774's Avatar
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    I would use the same lube on the rear wheel splines.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #168
    Just pulled the transmission and I am wondering, does this look more like a transmission seal leak than the main engine seal? Everything I wipe off here is black and does definitely not look like my fresh engine oil. I havenít pulled the clutch and flywheel yet, so I will get more insight then.
    Assuming it is the transmission input shaft, it appears to me I can replace that from the outside without opening the transmission, right? As always, thanks for any feedback!








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    Olaf - Austin, TX MOA #200565
    Current bikes: 2012 R1200R Classic, 1973 R75/5 www.R75slash5.com, 1969 CT 70 (108 cc engine)

  4. #169
    Liaison 20774's Avatar
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    You should make sure that the oil has more of a gear oil smell, ie, more sulphur before you start yanking the flywheel, etc. Yes, the input seal to the transmission can be changed by pulling it out from the outside. Pay attention to the depth of the current seal. I tried to use some sheet metal screws and a slide hammer to get my seal out. Wasn't working too well. Went up to the dealer and he had it out in 15 seconds. He used a special puller...Lysle. Brooks discusses it in one of his rebuilds. Probably worth investing in this:

    https://forums.bmwmoa.org/showthread...al-replacement
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  5. #170
    Quote Originally Posted by 20774 View Post
    You should make sure that the oil has more of a gear oil smell, ie, more sulphur before you start yanking the flywheel, etc. Yes, the input seal to the transmission can be changed by pulling it out from the outside. Pay attention to the depth of the current seal. I tried to use some sheet metal screws and a slide hammer to get my seal out. Wasn't working too well. Went up to the dealer and he had it out in 15 seconds. He used a special puller...Lysle. Brooks discusses it in one of his rebuilds. Probably worth investing in this:

    https://forums.bmwmoa.org/showthread...al-replacement
    From the look and smell, I am pretty sure it's tranny oil. And thinking about it some more, how would engine oil even get to the transmission input shaft area? Would have to go around the clutch and flywheel somehow.

    Since I bought the fly wheel puller, main shaft seal and oil pump o-ring already, I will go in there and replace them. The seal puller tool definitely looks like a worthwhile investment. Wish me luck
    Olaf - Austin, TX MOA #200565
    Current bikes: 2012 R1200R Classic, 1973 R75/5 www.R75slash5.com, 1969 CT 70 (108 cc engine)

  6. #171
    Liaison 20774's Avatar
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    Have we discussed blocking the crankshaft in the front of the engine before the flywheel is pulled?
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  7. #172
    Quote Originally Posted by 20774 View Post
    Have we discussed blocking the crankshaft in the front of the engine before the flywheel is pulled?
    Yes, many times, but thanks anyways fro bringing it up!

    Something else just came to my mind, how do I know if the transmission output shaft seal is good? Darin and measure the cc's of the tranny oil to determine if anything migrated in or out of there?
    Olaf - Austin, TX MOA #200565
    Current bikes: 2012 R1200R Classic, 1973 R75/5 www.R75slash5.com, 1969 CT 70 (108 cc engine)

  8. #173
    Liaison 20774's Avatar
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    I'd pull it and replace it. Peace of mind. I doubt you'd be able to make a definitive decision based upon fluid measure. Unless you lost 1/2 a liter...then you'd have bigger problems.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  9. #174

    Oil leaking from fly wheel hole

    When I removed the flywheel bolts, oil came out of two of the holes, similar to what Brook Reams shows on his website (credit below the photo). He used "Permatex Ultra Grey Ridgid High Torque RTV Silicone" to fill the holes before putting the bolts in.

    Since no oil was leaking with the bolts installed, I am wondering if that is really necessary? Maybe just use a bit of thread sealer instead?

    Capture.JPG

    Photo credit Brook Reams
    http://brook.reams.me/bmw-motorcyle-...-cover-o-ring/
    Olaf - Austin, TX MOA #200565
    Current bikes: 2012 R1200R Classic, 1973 R75/5 www.R75slash5.com, 1969 CT 70 (108 cc engine)

  10. #175
    Liaison 20774's Avatar
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    Where would that oil be coming from? I don't believe it is a through bolt such that the thread side sees the inside of the engine case. Maybe it's just leaking from the backside of the flywheel or something...

    I suspect that the specs call for a dry torque, that is no lubrication on the threads. If you use a sealant, you'll need to back off the applied torque value as you could possibly apply too much when sliding friction is allowed with the lube.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  11. #176
    Quote Originally Posted by 20774 View Post
    Where would that oil be coming from? I don't believe it is a through bolt such that the thread side sees the inside of the engine case. Maybe it's just leaking from the backside of the flywheel or something...

    I suspect that the specs call for a dry torque, that is no lubrication on the threads. If you use a sealant, you'll need to back off the applied torque value as you could possibly apply too much when sliding friction is allowed with the lube.
    It's definitely not from the backside of the flywheel. It was dry when I took it out.

    So it must come from the inside of the engine somehow, but I agree, it doesn't make much sense.
    Olaf - Austin, TX MOA #200565
    Current bikes: 2012 R1200R Classic, 1973 R75/5 www.R75slash5.com, 1969 CT 70 (108 cc engine)

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