Honda-SOHC
SOHC.co.uk Forums => CB750 => Topic started by: leadnavel on January 18, 2022, 09:24:47 PM
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I have a quandary, do I leave things how they are or do I flip the rotors to the workshop manual orientation?
On stripping down the oil pump on my 750K7 to renew the seal and O-rings I noticed that the rotors have been installed the wrong way up NB: when taking off the end cover of the rotor the ‘punch marks’ are not visible, they are on the underside and facing downwards!
This is where things get a bit more confusing, I was hoping for more clarity when I bought a second oil pump.
The rotor surfaces on my oil pump looked a bit marked/scored so not knowing if this was serious (I have subsequently found out that the light scoring on the my original rotors isn’t terminal so I will use my original pump) I bought a second hand K7 pump, primarily as a replacement and potentially for spares. I have stripped the pump and if a spare is not required will rebuild to sell on. On stripping down this second pump I also found that the rotors have also been installed with the ‘punch marks’ downward!
This is my quandary, on reassembly should I leave things as they are and insert the rotors ‘punch marks’ downwards or flip them and install as per the manual? My workshop manual does mention the the punch marks it says “Install the rotors with the puntch mark facing to the outside”. My Haynes manual does not mention punch marks on rotors at all.
My bike has 36'000 Miles on it and was working fine before strip down, although, FYI, the bike has been off the road since 1985, the engine strip down was started in 2019. I don’t know the history of the replacement pump.
Any advice on this would be welcome.
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Replace them the way you took them out. As long as the punch marks line up it doesn't matter which way up they are, but both punch marks must be the same way up.
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Thank you (again) Nurse Julie for your assistance, much appreciated.
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