[Jimm]

I’m trying to track down a slight oil leak from the front on the engine on the left side. Since the oil pressure switch is covered in oil and is up wind while riding, I think it’s the smoking gun. (This pics is after washing with degreaser)

Can anyone tell me the switch should stick this far out of the switch nut? Maybe this is the wrong switch?

Finally, can anyone tell me if there should be a crush washer or gasket between the switch and the switch nut? the parts diagrams says no by the looks of it.

cheers

 

[ubertalldude]

Switch has tapered threads if I remember correctly, so no washer.

 

[Jimm]

Thanks ubertalldude. The switch came off with the switch nut so it was a tight fit.

 

[Spockster]

Agreed, no washer between the switch and adapter. That does look like the correct switch. Replacements can be pricey, I got one for a Ford at $8, but had to re-thread it, the original has British Pipe Threads, BPT, if I recall.

Make sure the oil isn't coming from the weep hole located just below the crankcase vent, higher than the oil switch. A bad o-ring on the spark plug well will cause an oil leak there. Here's a thread with a pic:

Oil leak: another common issue

again while my motor is out I thought I'd post some decent pics of another common issue: oil leak in the front cylinder if the front of your engine is covered in oil from the exhaust down this could be why, in the pic below is the front of the motor, you see a little tube sticking out with a...

www.vn750.com

 

[ubertalldude]

Good call, spockster. I almost forgot about that potential leak point. Also worth looking at the crankcase breather/vent, it’s in a similar location on the front of the engine above the switch

 

[Jimm]

Thanks spockster. I can see oil on the crank case and cylinder barrel, but not the spark plug seal as far as I can tell. The radiator is still on the bike, but I can feel the weep hole. Thanks for bringing this to my attention. Makes much more sense than a leaking oil pressure switch.

 

[Spockster]

Thanks spockster. I can see oil on the crank case and cylinder barrel, but not the spark plug seal as far as I can tell. The radiator is still on the bike, but I can feel the weep hole. Thanks for bringing this to my attention. Makes much more sense than a leaking oil pressure switch.

You're welcome.

It's not uncommon for an oil sender to leak from the switch body. Might have to clean it all up and see where the oil appears first.