1970 CL175 leak at right cylinder cover tachometer

[jayache80]

Hello all,

As you can see in the pictures below, I have a leak coming from the right cylinder cover that houses the tachometer cable. Does this require a new gasket or oil seal? Or both?

Thank you

[rortiz5]

Have the same issue on my CL175k5. For me it's leaking on the bottom right corner pan screw. I replaced the gasket twice and even bought a like new condition housing of ebay and it's still leaking the same. I'm not really sure where to go from here.

[mikeonabike]

There is a small seal in the tacho drive, Have a look on CMSL Honda Cb175k4 Super Sport England Right Cylinder Head Side Cover - schematic partsfiche

[Gixxer-18]

+1 on Tacho drive Oil seal. The gasket could leak, but you'd see the oil outside the Tacho box not inside. To remove the old seal; screw a self tapper into the seal and pull it out. Use a socket to drift the new one back in, and protect it by using the old one as a buffer. Pull it out again with the self tapper.
HTH
Nigel.

[Simo]

As above the oiling path to the cam/ cam journals /head would mean oil outside the journal if the Gasket or Gasket faces were bad.
The only way to get oil in the area shown is via the Tach drive and the oil seal is the most likely culprit

[Richard_Pitman]

Memory may be failing me here, but I thought the seal simply pulled out along with the tacho drive mechanism, gripping the flats on the drive pin with pliers ?

[ajk4send]

Although in my CB125 (1972) construction for this parts is almost the same. I had the same problem, but it was due to leak from tacho gear. I have replaced part no 11 from partsfiche drawing. It is available in Honda service in Europe (part no in Honda documentation has a reference for new replacement number).
Tacho gear is lubricated by motor oil.

[Richard_Pitman]

Just for reference, the oil seal IS simply removed by pulling out the whole drive gear assembly using fine nosed pliers.

Don't misplace the small washer on the far end, easy to leave this behind then find that the gear doesn't go back into position when refitting. Put the washer on the end of the shaft to avoid this happening.

A suitably sized thin walled socket will push the new seal home into its housing. I assembled the seal onto the shaft first, then refitted as a complete assembly, using plenty of oil on it.