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I have a 1971 Commando with an external oil filter. I cannot remember if the tap is on or off when in line or at 90 degrees. I would appreciate any help
The only exception is for…
The only exception is for stop cocks (drain down taps) where it is normal for the tap to be off when in line with the pipe. That prevents vibration from causing the weight of the tap lever to drop down and empty the tank or boiler.
Only way to be sure is to…
Only way to be sure is to remove it from the oil line and inspect it internally
External oil filter
Thank you for your comments
I think I need to detach too be certain
Rule of thumb, if the tap handle is in line with the pipe, that is the "open" position. eg petrol taps, plumbing fittings etc.