I have the following problem on my ’41 H and its driving me crazy.When I bought my H it was missing the belt pulley gearbox and pulley. Covering the gearbox opening was a thin homemade flat metal plate and a gasket. There was some minor grime build up on the plate every once and a awhile, and I chalked it up to the non-factory standard part and the fact that the bolt holes were 2X the size they should have been (they were flame cut holes, not drilled) I finally got my hands on a belt pulley gearbox, cut a new gasket, and installed it using silicone gasket sealer as an added safety. Immediately I began to see leakage out of the back of the gearbox at the gasket (By leakage I mean about 2 tablespoons of tranny oil every time I shut down). I figured I had jarred the gasket out of position sliding it into place under the gas tank. After two more tries with new gaskets and silicone, oil was still leaking. So instead of trying to replace the belt pulley as I had, I did two things. 1) I checked the flatness of both the tranny case where the belt pulley gearbox sits, and also the belt pulley flange and 2) instead of trying to slide the gearbox into place under the gas tank, I removed everything in the area to allow me to install the gearbox unobstructed from above. The flange on the gearbox was flat. On the tranny cover, at the area it was leaking, it was dished inward .015 inches, certainly not enough to cause a problem, but…. When I reinstalled the gearbox a 4th time, I used a good bit of silicone on the back side and didn’t initially torque down the bolts (I let the weight of the gearbox form the gasket). The first time out – no problems. The second run a few days later and the gearbox is leaking again! As far as I can tell the gearbox is splash lubed, so there shouldn’t be any pressure that would force the oil out the back of the flange. So does anybody have an idea about what is going on? Art
| 
