SOHC.co.uk Forums > CB750
Oil pressure issue / motor rebuild
Trigger:
--- Quote from: AshimotoK0 on November 10, 2016, 08:11:00 AM ---
--- Quote from: Trigger on November 10, 2016, 08:10:01 AM ---I think you time machine to get part number 12020-300-305 Ash ;)
--- End quote ---
Just buy quad rings . in Viton
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Yes Ash, but will not fit the OEM head gasket that CMS sell ;)
AshimotoK0:
Use later gasket part of NB gasket set or I know a sandcast guru who just used 'O'rings from RS. He fitted this arrangement on the 750K1 that UK Pete got off him, prior to selling him it . He did tell me the RS part number in an email somewhere. Will have to ask Pete if it panned out OK ITO oil leaks/head sealing.
Greebo:
--- Quote from: Trigger on November 09, 2016, 08:00:59 PM ---
--- Quote from: Greebo on November 01, 2016, 09:00:35 AM ---Another very good tip for anyone doing a rebuild, or just doing any head work.
The genuine Honda rubber "O" rings in the head that create the oil seal were found to be to thin, hence many of these bikes had leaks from the head...to stop this happening you can buy the same Diameter O rings that are slightly thicker [1mm]
So that when you torque the head down it does create a proper seal where as the stock O rings did not , this was a fault Honda never cured or modified.
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If you use a O ring 1mm thicker it will not fit in the recess or the hole in the gasket as it is a 16mm hole. The OEM O ring is 11ID x 2.4mm, 1mm thicker will give you a overall measurement of 17.8mm :o
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Well it worked on mine, & if I remember right Steve the bike builder who specialises in rebuilding the sohc engines, he bought the washers from a local shop that supplies O rings for all sorts of applications, he said they are the same diameter as stock but slightly thicker/deeper, I am sure he said 1mm...any how he has never had a engine back with an oil leak from the head or anywhere else.... ;D
AshimotoK0:
There is an obvious split between people on forums. As such I am deffo in the 'hobbyist' camp so don't take anything I post as here being gospel or always personally tried and tested. All I can say is that where bikes are concerned & not being in the 'trade' ... I have NO trade ;) secrets. If I have any info,tips, cheapo sources etc I will share on here 100%, as I don't earn my living from it (thank God).
MrDavo:
Get a room you guys, or an O ring thread ;D
Anyhoo, I used the O rings from the Athena gasket set, they seemed to fit fine, we'll see when I get her running, though.
Here's the motor on the bench, ready to rock, shiny cam cover looking good. Apologies for the Murkovision, the inside of the phone lens gets dusty in my pocket somehow, I sent it away to get cleaned a while back, but its getting foggy again. I have proper cameras, but tend to keep them away from oily fingers.
After Leigh and Ed turned up, we chucked it in and checked the dates we had written on the wall, on August 3rd when it came out, predicting when it would go back, Leigh's was 3 October, I was 1 December and Ed was 1 January 2017, so I win. Leigh accused me of sitting on my hands until victory was assured.
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