Vintage and Classic Hondas

Crankshaft seals

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mainexile

Crankshaft seals

Stepson recently bought a 1981 cb750K that needs work. After general cleaning (carbs and engine), I removed the left (points) cover to check timing. Cavity had oil in the bottom and when started, oil leaked from all around the points plate and advance mechanism. I'm assuming that the crankshaft seal is leaking, but when I check the illustrated parts list, it shows only one crankshaft seal - on the right side. Does anyone know if the left side uses the same seal or does it have a different one. I plan to replace both end seals as well as other oil seals, but I don't know what to get for the left side. Thanks in advance.

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Re: Crankshaft seals

Administrator

An 81 does not have points.
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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
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mainexile

Re: Crankshaft seals

I'm well aware of that - I just used the terminology to identify the location. That being said, do you have any idea about the crankshaft seal?

Rodgil

Re: Crankshaft seals

There isn't a LH crank seal. The ignition ignitor runs wet, oil drains from the cavity back into the crankcase. Sealant on the outer cover is all you need.

1982 CB750F
1978 Triumph Tiger 750
197? Yamaha DT175
197? Hodaka ACE 100

Rodgil

Re: Crankshaft seals

In reply to this post by mainexile

Sorry, wrong terminology. I'ts a pulse generator behind the cover, not an ignitor, on the DOHC motor.

1982 CB750F
1978 Triumph Tiger 750
197? Yamaha DT175
197? Hodaka ACE 100

mainexile

Re: Crankshaft seals

Thanks for the info. I haven't worked on bikes since the early '70s, but I've worked on a ton of cars and boats. In those worlds, I've never seen a configuration like that...hard to comprehend that the pulse generators would be in a "wet" area.