Initial Start Up of a Honda CB750 Motor After Rebuild (Oiling):

Fancy assembly lubes are a great idea and a must. But, what happens when your oil pump or oiling system will not pump up in a safe period of time?

What is a safe period of time? We have seen motor oiling systems not "pump up" for several minutes. So, the question is...how long are the assembly lubes expected to last if the oiling systems has not pumped up in a reasonable amount of time?

With valve spring pressures reaching almost 100lbs at installed heights and a flat-tappet design (rocker arms), we need instant oil pressures.

Here is an oiling tech tip that some of you may not know:



Step #1

Remove the clutch cover, clutch pack and shown parts. By removing these parts, access to the oil pump gear can be obtained. The oil pump gear is located behind the clutch assembly. If you are doing a motor rebuild, install the clutch assembly last.




Step #2

Pour approx. 1 quart of oil into the lower end to submerge the oil pump pick up in the sump pan. Connect oil lines and fill oil tank.




In case you are wondering how much 1 quart of oil will fill your sump pan, almost full. Be aware the oil in the sump pan will disappear almost immediately when the motor cavities and oil filter area fills with oil.




In case you were wondering, the pick up screen is about 6.5 mm from the bottom of the sump pan. More useless information.




Sometimes, like this motor, the splines to remove the outer clutch hub can be difficult. A simple puller will do the trick.




This photo shows an oil pump gear mounted in a drill that will be used to motivate the oil pump only. Once again, the goal is to get the oil circulating immediately without turning the motor over and relying on assembly lube to last for a undetermined amount of time.



With the oil lines hooked up to a oil tank and approx. 1 quart of oil in sump pan, turn the oil pump gear with a drill counter clockwise and watch your oil pressure pop right up, unless you have other oiling problems of course.

You have now filled, bled, and pressurized the motor cavities and oil filter area with oil without turning the motor over, allowing for instant oil pressures.



The clutch area can be assembled.


To be continued (Air in oil will not lubricate.)





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