What's up fellas?? Recently moved my homebuilt S+S Shovelhead rigid and got a low mileage '98 Springer Softail. Cadallaic Style compared to a big tire rigid..my a$$ thanks me...Doing the general service and adding parts I've acquired so far. Finished up with a thorough wash/polish. My primary drive has a small leak...The problem with that...it's leaking dead in the middle on top..I had noticed it before and tightened the bolts..Given the location...the gasket is clearly visible and looks fine, I suspected maybe the vent was plugged and causing a pressure build-up inside the case. Futher inspection revealed a drop of silicone on the back side of the inner primary...looks to me like it's a makeshift plug. It's dead in the middle on the backside of the inner primary cover..I'm suspecting someone may have removed the vent line and plugged the hole. I don't have a manual...YET...Can someone post up?? All info is greatly appreaciated...Anyone know where an exploded view is on-line?? It's good and warm here in the Southland..Ride safe and have fun..El Dee

 

Behind the clutch pressure plate there is a "bullet" with a concave end that mates with the clutch release push rod and the other end is slightly convex that pushes against the pressure plate. That extension (bullet) has a flat ground on it to let it breathe thru the transmission shaft using the transmission vent. No actual vent on the primary housing(s) at all.

 

Maybe the chain adjuster threads in the inner prim was drilled thru by mistake on a monday at HD or maybe friday I have seen this before Don't know the cause but silicone was there

 

I wonder if someone dropped the inner primary & chipped the case. It's aluminum. It would be an easy fix once the inner is removed.

 

The silicone is where I would approximate the chain adjuster to be. Looks to be doing the leaking when parked. This is why I suspected a vent issue. Like I said it's dead on top in the middle. Mounting surfaces and gasket appear good.