SOHC.co.uk Forums > CB750

oil pump rebuild

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MrDavo:
Just an afterthought, as I've done this in the last fortnight, so have been through all the 'what could possibly go wrong' thought process, when you are working out which of the oil pump ports is connected to the feed from the tank, to stuff the Vaseline into,  it's NOT the one connected to the big hose right in front of you, that's the return hose, though it doesn't look as if it would be. The feed hose is the one hiding at the back.

Easy mistake to make, been there done that.

adriangsmith:
oil seal part number is 91208MN1771
Dimensions 11 x 15 x 3 mm.

https://www.davidsilverspares.co.uk/parts/by-part-number/hpart_91208MN1771/

adriangsmith:
Well, at long last I have oil pressure.
This was the third strip down of the pump after trying and failing with the vaselene trick.
Took me 3 hours to get all the vaselene out!
So the pump was fully strippe dand ultrasonically cleaned.
Replaced the shaft oilseal and checked all wear limits on the rotors, all of which were well within tolerance.
Reassembled the pump with the rotors and housing lightly smeared with grease to help give an initial pull.
immersed pump in the drained oil from the last attempt and primed the pump whilst holding the non return plunger open.
This released all the air and the pump was bled with 5 minutes.
Loosly assembled pump back onto engine and filled the oil tank allowing it to drain through the lines before tightening the oil pump.
I did this to minimise any chance of an airlock on the supply side.
Left the oil filter off and kicked over until oil was seen at the filter inlet.
It took another 5 minutes of kicking to get oil up into the main gallery and the light went out.
Time for a rest now and then friday hopefully make sure i have oil to both sides of the cam and then see if she will fire up!


I will say that there is an error in Ash's megamanual pg. 304. (shown below) The arrow showing the direction to turn the gear is pointing the wrong way.
Had me puzzling for half an hour how i could have managed to build it back up wrong!
Finally checked the rotation of the drive cog in the engine and worked out the drawing was wrong.

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