SOHC.co.uk Forums > CB750
oil pump rebuild
MrDavo:
The pumps are little marvels of precision engineering, I wonder if the factory primed them before assembly, or did it somehow when installed, say with a pressurized oil feed?
Trigger:
--- Quote from: philward on December 27, 2016, 08:18:50 PM ---I have been following the various start up oil pressure threads and having had difficulty getting pressure on the last rebuild, am picking up tips for the next start up (some time off yet). I am obviously going the multi recommended vaseline route but am intrigued at what point do you change the oil tp get shut of the residual vaseline from the oil - we are all so particular about our oils/viscosity, given that vaseline isn't made to lubricate with the loads on a hot engine, won't there be bearing damage if you don't change the oil ASAP?
Over to you SOHC experts!
--- End quote ---
The Vaseline will just melt when the oil is hot and mix in with the oil, along with other lubricants that you have used on the build. Just change the oil and filter after running in, 300 to 500 miles.
adriangsmith:
I fear I must be doing something wrong.
Sump and pump off, dismantled pump and packed pump with vaseline, reassembled and filled ports with vaseline and it was sucking it in well, fit back onto bike fill with oil and still absolutely no oil making it to the main gallery.
Oil was flowing well out of the tank with the pump off.
What else would stop the oil flow?
plunger valve was moving easily.
Could i have put the rotors in incorrectly? both drive pins were in and located properly.
Maybe I blocked an oil pathway when i reassembled the engine cases?
Also just found this diagram that I found useful to explain the flow and return routes.
adriangsmith:
Starting to get the feeling this oil pump is shot even though rotors show very little wear and are well within limits.
Trigger:
Are the jets in the head unblocked ?
The oil travels up the head studs, are these oil ways clear ?
Is oil getting to the oil filter bolt ?
Do all the main oil ways have there caps on tight and is the oil pressure switch nice and tight ?
Did you put a new O ring in were the crank cases fit together and the O ring fits round a dowel ?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version