Cb360 oil leak

dantyler92

dantyler92

New Member
First off, I'm sorry for clogging the feed with questions, just keep having issues and you all a great help!

My CB is leaking oil from what I think is the bottom left of the crankcase. (Could be completely wrong on that but attaching a picture of where). It's coming out pretty fast and has never been an issue until today. When I turn the bike off there is a hiss coming from what appears to be near the leak that had never been there before today.

I have just gotten done rebuilding the carb and doing my cam chain adjustment and valve clearance adjustments, maybe doing the am chain improperly caused it?

As always thanks everyone for their insight!

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In your other thread you mentioned a cracked valve inspection cap. It may be coming from there.
 
Take that cover off and look. Probably your shifter seal, but you'll never know until you look.
 
Both the case covers have a drip of oil on them in the pic, so it's difficult to tell.

Possibilities are the clutch pushrods seal, final drive seal, gearshift seal, neutral switch, or generator gasket or alternator wire seal.

All easy to replace apart from the final drive seal.

Whip off the final drive cover and see what's happening.

Steve

As above
 
Thanks everyone for the responses. I'm going to open it up today and check all the seals and try to track down the leak. I'll let you know what I find!


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78f2d9811146937fe57172a77c5fb5df.jpg



Here is the culprit. Started leaking right when I fired it up. Anyone know where I can find good instructions for replacing it? I've looked a bit but have been unsuccessful



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Also I just read something about putting hondabond on seals to stop them from leaking? Would that be an option, id love to not wait a week on shipping and get back to riding asap


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That neutral switch retainer is missing. It's not holding it in like it should.
 
You also need to find out why the case pressurised and moved it in the first place.
The oil pressure feeding to gearbox isn't high enough to push it out
Seal looks like it's been damaged by drive chain.
You could probably remove sprocket, wash everything down with some brake or carb cleaner and 'glue' it back in. I would look at mounting a plate of some sort to hold it in position.
I've used a light spring and a washer on the gear change shaft to stop seals coming out (washer to prevent seal getting damaged) should be possible to do the same on clutch push rod seal but you don't have much clearance to drive chain so a retaining late would be a better option.
It's a common mod on CB350 'race' bikes so you should be able to find some pictures (or maybe even someone who makes plate?)
 
Any thoughts on that? It's back to running fine but there is a ton of white smoke from the exhaust during acceleration and from what I've read it seems like oil is being forced into the Pistons and burning?


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Wow, we must have hit post at almost exactly the same time ;D
Valve guide seals are pretty common failure as they are probably over 40 yrs old and really crusty
You need to do compression and leakdown tests to rule out rings and valves first though
 
Are the valve seals anything super complicated to replace? I don't have the means to do compression and leak down tests unless I bring it in to have them done.

Also, can I ride the bike safely enough while I wait for parts?


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As long as you check oil level daily and don't get a ticket for producing smoke you should be able to ride it for a while.
If plugs start getting wet with oil it means you've got cylinder damage rather than vale guide seals, but, if it's the exhaust guide seals it will never cause any damage (as long as oil is kept topped up)
What happens on exhaust side is the oil 'evaporates' inside the pipe so never gets into combustion chamber, that's what happened with mine but I 'panicked' and stripped motor when I got home. Couldn't find any cylinder, rings or valve damage but when I pulled valves the exhaust side seals were shot, itake side just a bit crisp and not leaking
Probably beating on it for 50+ miles caused heat build up on exhaust side and seals failed (well, 50+ to Daytona and about 40 miles back before it 'broke' 8) )
Not too shabby for a 40 yr old motor with minimal servicing
I didn't even changer the oil as it looked new (wanted to see how far it would go) I think it had been in dealers for cam chain tensioner mod and never ridden after it was delivered 'home'
 
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