Topic: Cleaning the oil tank.

[Hotwheelbill]

I plan to just submerge it overnight in ..... something. I have sprayed brake cleaner as best I can but still see crud stuck to the walls. So, would Vinegar work??

[pjlogue]

I would not use anything acidic or caustic if it is just crud (old varnish deposits or oil based deposits)  Use kerosene or mineral spirits to remove organic "crud"  If you find the inside of the oil tank is rusted (unlikely if it had oil in it and hasn't gotten water in it) you can then decide what to de-rust it with. 

-P.

[flybox1]

Kerosene rinse.  Once.  Done.

[disco]

I used a plain welding rod (with no flux coating) to break up the crud. Then wrap old rag around rod to get the crud out. Follow by flush with Kero.

[754]

Rattle some nuts and bolts around in there with solvent..

[Hotwheelbill]

I like the kerosene idea. But I did not have any. So I used an entire can of brake cleaner into it and sloshed it around a good bit and emptied much of it out. I have plenty of diesel available to me so that's also what I used and it helped as well. I've been took my high pressure nozzle from the water hose and blew out as much as I could and against lost it around pretty hard. Then an acetone rinse. It looks pretty damn good to me. So it's on the bike. Third oil change still comes out milky. But then again I am still adding a little bit of diesel to it. Next Oil Change will be straight oil and a filter change. This damn bike starts on the first kick already. And has not put out a bit of smoke. So I am really hoping everything is good. This is even after I filled the top in with oil through the tappet covers.

[PeWe]

I have an CB750 K2 oil tank that has fresh powder paint.
Inside thin layer of rust I'll remove with vinegar for some days. After that flush with water, blow clean dry with air and all dust out. End with white spirit (std degreaser), shake it good again followed by a thin layer of oil and shake it to protect all surfaces inside.

No small parts in tank that will enter the oil pump direct without any filter nor strainer.

[flybox1]

I hope you are getting it nice and hot before you drain the oil.  It'll help with getting rid of the moisture.

[Hotwheelbill]

I hope you are getting it nice and hot before you drain the oil.  It'll help with getting rid of the moisture.

 probably not hot enough. I've only run it for a couple of minutes between oil changes. I have been too worried about how thin the oil mixture is. But the next Oil Change will be straight oil and I will do that. Thank you.