malmac wrote: ↑Tue Mar 09, 2021 3:49 amWhat an interesting post. The photos are good and the idea quite achievable.gray7252 wrote: ↑Sun Mar 07, 2021 4:55 pmI may have what flyingtpot is referring (or it's a custom job). I have a 1956 R69 where the final drive has had a vent added by previous owner. Body of 'vent' is aluminum, and the vent hole is about 1/16" dia. I grabbed a piece of wire and stripped it back about 2.5" and fed it into the hole, and it appears to go all they way straight through.
The main drive casting looks like it had a flat (slight counterbore) machined into it for this to sit flat.
You have me thinking, as I have a non vented final drive that is ready to be rebuilt with all new bearings and seal.
Thanks.
Mal
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Non Vented Final Drive on my ‘55 R50
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Re: Non Vented Final Drive on my ‘55 R50
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Re: Non Vented Final Drive on my ‘55 R50
Having done both types (fill plug and top of housing) of these design mods, my preference is the top of the housing. The gear oil level is than the furthest distance from the vent hole.
Bikesmith01 wrote: ↑Thu Mar 11, 2021 7:36 pmIt's a pretty straightforward job. I made a very small (about 1.5mm) hole from the inside of the plug through to the outside, then enlarged it only part of the way through from the outside. So any oil that comes through the 1.5mm hole will hopefully collect in the 'reservoir' inside the plug. Then I brazed in the vent plug.
Once I get the bike back up and running I'll follow up to let you know if it works. If not, I still have undrilled plugs
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Re: Non Vented Final Drive on my ‘55 R50
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1955 R50 / 1973 R75/5 / 1974 R90/6 Hack / 2015 RT
Yard Art 1968 +/- Hodaka & SACHS
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Re: Non Vented Final Drive on my ‘55 R50
Yes I will give it some thought. It is just I have some other projects which have to come first. The next one is building the frame for my son's K1100 to mount his side car. He has a K100 with sidecar but the frame on the 1100 ends up being different so we need to make a whole different framework.flyingtpot wrote: ↑Fri Mar 12, 2021 9:59 pmRecommended that you do it Mal. For you, it is a straightforward design item. The time to do the mod is definitely best when the housing is 'empty'.
malmac wrote: ↑Tue Mar 09, 2021 3:49 amWhat an interesting post. The photos are good and the idea quite achievable.gray7252 wrote: ↑Sun Mar 07, 2021 4:55 pmI may have what flyingtpot is referring (or it's a custom job). I have a 1956 R69 where the final drive has had a vent added by previous owner. Body of 'vent' is aluminum, and the vent hole is about 1/16" dia. I grabbed a piece of wire and stripped it back about 2.5" and fed it into the hole, and it appears to go all they way straight through.
The main drive casting looks like it had a flat (slight counterbore) machined into it for this to sit flat.
You have me thinking, as I have a non vented final drive that is ready to be rebuilt with all new bearings and seal.
Thanks.
Mal
So the vented diff housing will have to wait in line.
Mal
Toowoomba- Australia
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Re: Non Vented Final Drive on my ‘55 R50
1955 R50 / 1973 R75/5 / 1974 R90/6 Hack / 2015 RT
Yard Art 1968 +/- Hodaka & SACHS
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Re: Non Vented Final Drive on my ‘55 R50
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
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Re: Non Vented Final Drive on my ‘55 R50
Edit to add that this looks like it may be the ultimate answer https://bmwclassicmotorcycles.com/index ... -dome.html
1955 R50 / 1973 R75/5 / 1974 R90/6 Hack / 2015 RT
Yard Art 1968 +/- Hodaka & SACHS
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Re: Non Vented Final Drive on my ‘55 R50
[/quote]
Yes I will give it some thought. It is just I have some other projects which have to come first. The next one is building the frame for my son's K1100 to mount his side car. He has a K100 with sidecar but the frame on the 1100 ends up being different so we need to make a whole different framework.
So the vented diff housing will have to wait in line.
Mal
[/quote]
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Re: Non Vented Final Drive on my ‘55 R50
When these machines were designed, BMW would not allow a service item like a filler plug serve as the production FD vent design. For BMW, designing the FD with a housing having a top mounted vent was trivial on this series machine.
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Re: Non Vented Final Drive on my ‘55 R50
Chris
1955 R50 / 1973 R75/5 / 1974 R90/6 Hack / 2015 RT
Yard Art 1968 +/- Hodaka & SACHS