SOHC.co.uk Forums > CB750
Problem with initial valve adjustment after rebuild
leadnavel:
--- Quote from: K2-K6 on May 23, 2022, 11:13:36 AM ---It's more a foible of the manual description and giving different information for two different tasks than anything wrong.
To set the cam originally (installation) you do as you've done with mark lining across am carrier split, and notch at 12 o'clock. The notch is not visible for setting tappet clearance with cover on and so not really significant.
Buuuuut, setting it like you are now with it all visible, put the camshaft notch at the bottom 6 o'clock and it will then conform to the schematic of which valves to set clearances at.
You've not got anything wrong, just how some things are explained in the text.
--- End quote ---
Thanks K2-K6 I will have a look at this this evening.
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leadnavel:
Thanks for you assistance guys, thanks for taking the time to help me out. I was able to have a tinker this evening and i'm now able to set the valve clearances, perfect. I was indeed getting pre occupied with the key/notch on the end of the camshaft! Now it's on to priming of the oilways prior to the initial start-up, now that's a whole another story, requests for assistance will probably be posted soon. Cheers
K2-K6:
Oil pressure initially from rebuilding;- take off oil filter, remove spark plugs, look into small hole in oil filter housing with a torch (not the central hole for bolt) spin engine until oil is present in the small hole, refit filter then spin for oil pressure.
Then check oil arrives at BOTH sides of head to oil camshaft either side of cam chain.
leadnavel:
I’ve read numerous posts regarding problems priming the oil ways on these darlings so I thought that I’d cracked it when I came across this option on cycleexchange
“Initial Start Up of a Honda CB750 Motor After Rebuild (Oiling)â€
http://www.cyclexchange.net/Tech%20Tips%20Oil%20Related.htm
All I seem to be getting when I use the drill attachment is the scavenge side of the pump emptying the sump pan and filling the oil tank, there’s no oil leaving the oil tank! No oil coming anywhere at the top end.
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K2-K6:
The assembly lubrication seals the bearings very effectively and air locks the system, preventing the pressure side of the oil pump from accepting the oil feed from tank. It just spins and does nothing.
Take the oil filter off (this stops the airlock from happening) turn pump by whichever method you want and watch for oil coming towards filter housing (all the pressure side has to go through this route to important bearings) as soon as you see oil present there, then the pump is primed.
Filter back on and it'll deliver everything else from then onwards.
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