Driveshaft endplay, 1975 Johnson 75 HP

[R.Johnson]

That does'nt sound right! I have never run across a drive shaft that did'nt require some shimming. Do you have the old thrust bearing that you can measure, and compare to the new one?

 

[PAMeyer]

Driveshaft endplay, 1975 Johnson 75 HP

Model 75ELR76. I have the geacase apart to replace the seals and also replaced the driveshaft thrust bearing because it seemed a little rough. I then removed the original .010 inch shim and took the shaft assembly to the local shop to be shimmed. Much to my surprise, I was told it was OK as is, without any shims, so I reassembled the gearcase. I measure about .022 inch endplay on the driveshaft. Is this OK? I don't want to damage the gears. Thanks in advance for your help.

 

[PAMeyer]

Re: Driveshaft endplay, 1975 Johnson 75 HP

R.Johnson, Thanks for your reply. I don't have the old thrust bearing. I did this work over the winter and tossed it after installing the new bearing. I don't want to go back to the shop and accuse him of measuring the dimension improperly, but it just doesn't seem correct as is.

 

[PAMeyer]

Re: Driveshaft endplay, 1975 Johnson 75 HP

I had asked the dealer several months ago to show me the gauge. I wanted to measure it and determine the needed shim value in the machine shop where I work. He wouldn't show it to me because there were stored away when not in use. To measure the nut torque, I attach a clamp to the drive shaft and then apply a torque wrench to it, while holding the nut stationary. Someone in this group suggested using the end of a broken crankshaft to attach to the driveshaft. It sounds like a great idea but I haven't found a broken crankshaft yet.

 

[R.Johnson]

Re: Driveshaft endplay, 1975 Johnson 75 HP

Go back to the dealer and ask if he has shim guage 320739, or the newer guage 391185, and ask if you could see it. These numbers are stamped on the guage along with the proper tolerance that is being measured. By the way! how are you holding the drive shaft to arrive at the proper torque on the pinion nut?