Oil and air leak in the alternator case ('85 VF500F)

Hello everyone,

I am working on restoring an '85 Interceptor and today while doing a leak down test (using about 40psi) turning the crank all the way to TDC on #1 where I started with, I have heard air leaking out from the left side. I took off the alternator cover and I can hear air leaking from somewhere behind the alternator. Putting the cover back on changes the hissing sound which seems to indicate the source is that area.

I have also found some engine oil - not too much in the alternator case while taking the cover off. Is it normal? Is there a seal behind the alternator?

Appreciate any feedback!

 

The alternator area is not sealed from the crankcase. There are air passages. It is normal to have a little oil in there when you pop the cover.

As for your leak down test...

 

inspect the valve stem tops carefully to check for distortion

 

Check for air bubbles in the radiator, pull the oil fill cap and listen for air there, also listen for air escaping into the exhaust or intake tracts. That way you can narrow it down to blown head gasket, bad piston rings, or faulty valves.