SOHC.co.uk Forums > CB750
Oil pressure issue / motor rebuild
Trigger:
--- 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.
--- End quote ---
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
Trigger:
--- Quote from: Oddjob on November 09, 2016, 09:42:47 PM ---Maybe he meant he still uses a 16mm but it's a 3.4mm thickness rather than 2.4mm thick? That would result in the 11mm ID being reduced slightly as when it squashes down it will spread a little more, don't expect that the ID is that critical though.
--- End quote ---
Very critical, as it is a oil way. On the F1 Honda still used 16mm ID but, put dowels and sleeves to update the gasket seal.
AshimotoK0:
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Trigger:
I think you time machine to get part number 12020-300-305 Ash ;)
AshimotoK0:
--- 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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