SOHC.co.uk Forums > CB350/400
Oil in my air filter
Athame57:
--- Quote from: McCabe-Thiele (Ted) on August 17, 2023, 10:27:17 AM ---Out of interest what is the condition of the inside of your vent pipe itself not just the long section but the drain section as well, it might look good on the outside, it could be well deteriorated internally.
--- End quote ---
I did look down the air vent tube yes, unblocked and looking ok to me, it is after all only 5 years and about 11,000 miles old. The bottom of the air box, and drain below were messy but unblocked. I'll do what you said when I do the valve clearances, I've also got the carbs off for converting to the Viton O-rings I got off Julie. If things don't improve maybe the top end rebuild I have in mind led by the need for a new cylinder base gasket might show something up.
Oddjob:
For peace of mind do a compression test, I had an engine in doing something similar and it was because the rings were allowing compression past them and into the crankcase, that forced oil out of the engine via the venting system. A compression test would show if that is the problem in this case.
Trigger:
--- Quote from: Athame57 on August 17, 2023, 01:04:46 PM ---
--- Quote from: McCabe-Thiele (Ted) on August 17, 2023, 10:27:17 AM ---Out of interest what is the condition of the inside of your vent pipe itself not just the long section but the drain section as well, it might look good on the outside, it could be well deteriorated internally.
--- End quote ---
I did look down the air vent tube yes, unblocked and looking ok to me, it is after all only 5 years and about 11,000 miles old. The bottom of the air box, and drain below were messy but unblocked. I'll do what you said when I do the valve clearances, I've also got the carbs off for converting to the Viton O-rings I got off Julie. If things don't improve maybe the top end rebuild I have in mind led by the need for a new cylinder base gasket might show something up.
--- End quote ---
Is the air box foam pad oily ?
Athame57:
--- Quote from: Trigger on August 17, 2023, 02:58:47 PM ---Is the air box foam pad oily ?
--- End quote ---
Yes, I wash it out now and then with petrol.
McCabe-Thiele (Ted):
--- Quote from: Athame57 on August 17, 2023, 01:04:46 PM ---
--- Quote from: McCabe-Thiele (Ted) on August 17, 2023, 10:27:17 AM ---Out of interest what is the condition of the inside of your vent pipe itself not just the long section but the drain section as well, it might look good on the outside, it could be well deteriorated internally.
--- End quote ---
I did look down the air vent tube yes, unblocked and looking ok to me, it is after all only 5 years and about 11,000 miles old. The bottom of the air box, and drain below were messy but unblocked. I'll do what you said when I do the valve clearances, I've also got the carbs off for converting to the Viton O-rings I got off Julie. If things don't improve maybe the top end rebuild I have in mind led by the need for a new cylinder base gasket might show something up.
--- End quote ---
I'm curious about the need for a new cylinder base gasket as if you are blowing oil out that might be due to excessive crank case pressure rather than seal & gasket failures.
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