Model: CB750 K8
About 2000 miles after a rebuild, I noticed a little oil on the head fins after a ride. Not too bad, but a few drips would result. This is not a pic of my engine, but just to show where the oil leak is -
- Area A seems to be where the heaviest concentration of oil is after a ride.
- Eventually it will drip from point B after resting on the side stand.
- No oil above or below, so the head and valve cover gaskets are good.
Soooo ... You assume pucks or valve tower stud, right? That's what I did, so I recently pulled the engine, took off the valve cover and valve tower assembly, sealed the studs with some high temp thread sealer and the pucks with some non-hardening gasket seal, re-torqued the head nuts while I was in there and then put her all back together.
First ride - same exact leak.
Ran a q-tip up inside the puck area and the hole where the leftmost valve tower stud threads into and it came back dry. The immediate area around the spark plug is also dry.
The only place left that I can guess where the oil might be coming from is the nut/washer that is on the cylinder stud in front of the spark plug. There looks to be a little oil around the base of that (although it is a low point in that area so inconclusive at best). The rest of the plug cavity is pretty clean.
So my question(s) -
- Is it possible/likely for oil to come out of that cylinder stud?
- If so, what is the easiest way to seal it?
I haven't tried yet but it looks like I might be able to get that nut and washer on and off without removing the valve cover, so I might be able to remove and retorque without removing the engine again.
Thoughts?