Home › Forum › Ask A Member › Johnson HD20 Drive Shaft Question › Re: Johnson HD20 Drive Shaft Question
October 28, 2015 at 2:08 am
#26168
@ MarvK. My HS-10 is at the cottage so I couldn’t check it but I went out to the scrap heap and pulled out an HD-20 or 25 lower unit. That bolt holds the inner drive shaft casing in place. The hole goes through the inner casing. It may have had a role in the assembly process but it appears to vent/drain the inner casing. The other two holes go into the outer casing. From the parts manuals the two motors (HD and HS) seem to have a similar construction with inner casing the driveshaft runs in. That help any?
Kev