1997 90hp Johnson m# 90JTSLEUA
Changing water pump and noticed side to side play in drive shaft( not end play)
What is acceptable? Nothing in my factory manual about this.
I don't think I have ever seen any specs on side play for the drive shaft, sorry I can't help you out.
I am sure someone with experience on your engine will come along and help you out.
This is a 2 piece driveshaft and sideplay is normal for them, so much if you lay unit on its side without waterpump housing it will press side of seal and leak oil out.