Replaced o ring, still leaks, lot when on stand. Apparently the fix is to get it machined for oil seal? Anybody done this?

 

Thanks

Hello, on my MAR there is a sort of -  'felt' washer on the gear lever shaft as well as the O ring ,  when both are in good condition the leakage is reduced , but not eliminated.

Have looked at machining the cover to accept an oil seal but haven't got round to it as I think there isn't enough thickness of metal to remove to get to the size of hole needed for an oil  seal ( I could be wrong )

  I did think of moving the side stand from the left side to the right side to eliminate the oil drip when the bike is parked up !

At the moment I have given up  on this annoying drip and just accept it as part of owning a 1970s Spanish bike 

Hope this is helpful

 

Thanks, this is so bad it siphons, will look closer.

Agreed on stand though!

Edited August 31, 20178 yr by nickyburnell

You might consider carefully polishing the o ring area of the shaft using Scotchbrite or super fine sandpaper.  

Then, use tne original o ring to get a size for it, then try a firmer rubber compound such as a 90 duro type.

Then again, if the case has corrosion pits in the o ring groove, it may be best to modify the case for a seal.

4 hours ago, pmk said:

You might consider carefully polishing the o ring area of the shaft using Scotchbrite or super fine sandpaper.  

Then, use tne original o ring to get a size for it, then try a firmer rubber compound such as a 90 duro type.

Then again, if the case has corrosion pits in the o ring groove, it may be best to modify the case for a seal.

Thanks

On ‎01‎/‎09‎/‎2017 at 11:10 AM, pmk said:

You might consider carefully polishing the o ring area of the shaft using Scotchbrite or super fine sandpaper.  

Then, use tne original o ring to get a size for it, then try a firmer rubber compound such as a 90 duro type.

Then again, if the case has corrosion pits in the o ring groove, it may be best to modify the case for a seal.

that's good advise ,

O rings come in different types of rubber and different thicknesses also,

may only need a firmer compound or  a fraction thicker material to make the difference,

if your clutch cover just slips straight over the gearshaft with no resistance/friction then the O ring may be too thin even if its the right diameter ,

problem is the easily available O rings all seem to be soft cheap rubber and not as thick as you may need

Hi, My MAR has an 20 x 14 x 5mm oil seal on the inside, not sure if this is standard or not looks like it was, an no leaks.