CB77 305 Sprung a Leak

akpasta · Post by **akpasta** » Fri May 18, 2012 3:53 pm

I noticed yesterday my engine has started to leak oil from a number of spots on the right side. I bought it restored, rebuilt engine with only 400 miles on it, I've put only about 1000 miles on it myself. Seems a bit early for it to start dripping, or is that just how these bikes are? Seems unlikely.

Is there a particular nut behind the engine cover or something that tends to vibrate loose, causing a number of oil leaks like this, or did I just buy bike that wasn't restored as well as it could've been? Please tell me this isn't something only a tear-down is going to fix, I paid good money for a "turn-key" restoration.

rzgkane · Post by **rzgkane** » Fri May 18, 2012 4:48 pm

I'd get a full seal kit and be ready to replace 'em all if necessary. 'Bout 4 of them in there. My Dream leaked from the same spot and most if not all the oil was coming through the starter sprocket seal. I replaced that seal and the crank seal and all is well again. Need a rotor pulling tool to get into the crank seal.

akpasta wrote:I noticed yesterday my engine has started to leak oil from a number of spots on the right side. I bought it restored, rebuilt engine with only 400 miles on it, I've put only about 1000 miles on it myself. Seems a bit early for it to start dripping, or is that just how these bikes are? Seems unlikely.

Is there a particular nut behind the engine cover or something that tends to vibrate loose, causing a number of oil leaks like this, or did I just buy bike that wasn't restored as well as it could've been? Please tell me this isn't something only a tear-down is going to fix, I paid good money for a "turn-key" restoration.

akpasta · Post by **akpasta** » Fri May 18, 2012 7:04 pm

Ya, i think it is coming from in there. When I pulled the cover to change the clutch cable out, there was a bit of oil in there, I could tell it was leaking from somewhere. It's gotten worse.

Charlie's Place recommended I check the push-rod seal underneath the clutch cover, which is a good lead, since I recently replaced the clutch cable, and my figuring out how the mechanism worked resulted in a lot of jostling of the push-rod, I also took the rod out and put it back. So I'll check that.

Vince Lupo · Post by **Vince Lupo** » Fri May 18, 2012 7:23 pm

Really stupid question -- you didn't recently lube the chain, did you?

akpasta · Post by **akpasta** » Fri May 18, 2012 7:32 pm

haha, no, it's definitely not that. I can see lots of drips below the engine, so the leak is probably pretty bad. Does NOT seem normal for a rebuild with 1500 miles to need a new seal job.

akpasta · Post by **akpasta** » Fri May 18, 2012 10:36 pm

stumbled upon Bill Silver's posts on the "Examiner" web site. Hey, I'm from San Diego too. Anyways, I see there's oil seals behind the kick-start cover and it's probably one of them, perhaps from extra pressure? or who knows. Guess I'll have to pull the cover off and see.

jensen · Post by **jensen** » Sat May 19, 2012 1:45 am

Hi,

Most people replace the seals when restoring, but forget about the surface of the shaft.
Within a few hundred miles the seal lips are in the same state as the replaced seals.

Or maybe a seal came out a bit, it happens sometimes, but mostly also because the preparation of the seal area wasn't good.

Who did the restoration ?

Jensen

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CB77 305 Sprung a Leak

CB77 305 Sprung a Leak

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