Home › Forum › Ask A Member › Johnson HD20 Drive Shaft Question › Re: Johnson HD20 Drive Shaft Question
This has the makings of an interesting question. I was curious so I went out and had a look at a couple of HD-20s in the garage. I have one that’s pre-war. The bottom filler is definitely a grease plug and a grease fitting will screw into place while the vent is higher up on the leg and has a smaller slotted screw. A green postwar HD was similar. Then in the clean out pile I found a gear case and lower leg from an indeterminate HD 20 or 25. The two lubricant screws were more modern with shoulders, coarse threads and gaskets. The top hole was clearly marked for hypoid. I’m with aquasonic in that if it doesn’t leak out you’re probably ok 🙂
BTW I’m convinced that those things multiply in the dark.