Chain case and oil tank
Posted: Tue Jan 23, 2018 1:12 pm
Afternoon all,
I'm giving my 1951 Model 18S a bit of a winter going over and decided to replace the chain case seal with one of the modified designs. I bought a new aluminium band at the same time because mine was scruffy. I decided to removed the battery carrier and footrest to gain better access for the job. The battery carrier was a bit fiddly because of the accessibility of the mounting nuts but not too bad. However I found that I couldn't actually remove the footrest from the bike, I got the nuts off OK and the square section shaft out but there wasn't enough clearance between the chain case and frame tube to actually get the footrest away from the bike - - is this normal? If I ever needed to fully remove the footrest I think I'd need to remove the complete chain case, hence primary chain, clutch etc, this can't be right, can it?
Anyway, on to the job, I fitted a thick washer to the outer chain case mounting pillar as suggested in one or two threads to allow for the thickness of the seal, however there was no way the new aluminium band was going to fit, the radius at the point where the band clamps together is all wrong and the band actually tries to dig into the seal. As a test I fitted my old band and this went on perfectly. There doesn't appear to be a huge difference between the bands when laid on top of each other. The first picture below shows the new band, the second picture the old band. You can see how the old band is much better fit at the joint.
Am I missing the obvious (again). On the face of it the band is simply too small with the incorrect radius.
On to the the oil tank. Having removed the battery carrier I can see the back of the oil tank. There are two pipes exiting the bottom of the oil tank and pointing towards the drive chain. One of the pipes is an overflow, I tested this by spraying a little WD40 down the 'highest' pipe visible with the oil tank filler cap removed. The other pipe exiting the oil tank has a piece of rubber tube fitted that is routed to a point above the drive chain, I assume (dangerously) that this is intended as a chain oiler but I can find no reference to this in the owners handbook or Pitman. If it is a chain oiler can it be adjusted or is it preset, also, how is it controlled, i.e. what turns it off? (I'm thinking about the use of vacuum with a Scott Oiler).
Once again, thank you in advance for any advice, this forum has been really helpful to a guy brought up on Japanese motorbikes.
Chris.
I'm giving my 1951 Model 18S a bit of a winter going over and decided to replace the chain case seal with one of the modified designs. I bought a new aluminium band at the same time because mine was scruffy. I decided to removed the battery carrier and footrest to gain better access for the job. The battery carrier was a bit fiddly because of the accessibility of the mounting nuts but not too bad. However I found that I couldn't actually remove the footrest from the bike, I got the nuts off OK and the square section shaft out but there wasn't enough clearance between the chain case and frame tube to actually get the footrest away from the bike - - is this normal? If I ever needed to fully remove the footrest I think I'd need to remove the complete chain case, hence primary chain, clutch etc, this can't be right, can it?
Anyway, on to the job, I fitted a thick washer to the outer chain case mounting pillar as suggested in one or two threads to allow for the thickness of the seal, however there was no way the new aluminium band was going to fit, the radius at the point where the band clamps together is all wrong and the band actually tries to dig into the seal. As a test I fitted my old band and this went on perfectly. There doesn't appear to be a huge difference between the bands when laid on top of each other. The first picture below shows the new band, the second picture the old band. You can see how the old band is much better fit at the joint.
Am I missing the obvious (again). On the face of it the band is simply too small with the incorrect radius.
On to the the oil tank. Having removed the battery carrier I can see the back of the oil tank. There are two pipes exiting the bottom of the oil tank and pointing towards the drive chain. One of the pipes is an overflow, I tested this by spraying a little WD40 down the 'highest' pipe visible with the oil tank filler cap removed. The other pipe exiting the oil tank has a piece of rubber tube fitted that is routed to a point above the drive chain, I assume (dangerously) that this is intended as a chain oiler but I can find no reference to this in the owners handbook or Pitman. If it is a chain oiler can it be adjusted or is it preset, also, how is it controlled, i.e. what turns it off? (I'm thinking about the use of vacuum with a Scott Oiler).
Once again, thank you in advance for any advice, this forum has been really helpful to a guy brought up on Japanese motorbikes.
Chris.