SOHC.co.uk Forums > CB350/400
Oil leak oil plug left side engine
JezzaPeach:
Erwin if it’s definitely that leaking I was thinking of suggesting looking at the CMSNL site as sometimes they state the dimensions of the O rings, but it is not shown for this one. If you measure the thickness and inside diameter with a digital caliper micrometer it could be worth trying a fractionally fatter one. eg if the thickness is say an odd 2.8mm get the common size of 3mm with the same inside diameter (cheap on eBay)
It might just provide a tighter seal? Subject to views of those better qualified than me!
royhall:
If your sure you have the correct seal and that's undamaged the only other cause is damage in the bore or to the plug. Get a strong light and magnifying glass and check for scores or even a small crack in the bore. On the plug, remove the seal and make sure nothing is underneath it causing a pressure point against the back of the seal. With hot oil at pressure it really doesn't need much damage to cause a leak.
ka-ja:
I have a parts list that describes it as O ring-9131930000-13x2.5mm
JezzaPeach:
Ditto. I thought my brake caliper was fine but the groove the seal went in was minutely corroded or discoloured and leaked.
SeanFD:
--- Quote from: Bryanj on October 04, 2020, 10:04:57 AM ---Always used paper and a pencil down the plug hole for Triumphs with a mag. Im 68 and still learning
--- End quote ---
;D ;D
That’s how I got started in motorcycle mechanics. I tried to find TDC on a CB125S – my first bike – using a pencil with the inevitable result.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version