Problems removing drive shaft from Johnson QD-16 10hp

[Stewart Mayer]

Hi Guys,

I just started opening up a Johnson QD-16, and I had trouble removing the lower unit gearbox.  I read up on “Leroy’s Rambling” the procedure, and it didn’t seem different than most other motors.  I removed the shift rod coupler, and undid the 5 bolts holding on the lower unit, and it detached but didn’t want to lower more than a quarter inch.  I made sure the shift rod was disengaged. So, I pried it with some force and the lower unit housing came off but left the drive shaft still inserted into the crankshaft!  The little drive pin in the shaft that engages the impeller made it’s own exit point out the top of the waterpump housing.

Am I supposed to remove the powerhead to remove the lower unit?  I haven’t seen any mention about that in my online searches.  And, if it is simply stuck and needs force to remove the drive shaft, is there a safe method to do that which doesn’t damage the driveshaft?

Thank you for any suggestions.  Stewart

 

 

[JACQUES]

sometimes the  drive shaft splines get rusted in the crankshaft.

patience required !  one option is to dribble some release agent down the upside down drive shaft and retry after a while.. THe oring may pose a problem if still installed so…..

removing the PH isn’t science  and will give you better access to the rusted splines ..soak soak soak

when done grease the splines install o-ring

see johnson  10th edition service manual page 423 for parts diagram.

 

Joining AOMCI has priviledges 🙂

1 user thanked author for this post.

Stewart Mayer

[Stewart Mayer]

Thank you Jacques,

That worked! I let it soak upside down, using a penetrating oil, and after an hour gave it strong tug and came out.  The oring was hard as a rock, and probably what kept it from coming out easily.

Thanks for the tips!

 

[Don]

Be sure to clean off those splines as well as you can by spraying the driveshaft splines with light oil and running the driveshaft up and down many times into the crankshaft.  I doubt the stiff oring was holding the driveshaft into the crank, you were lucky to get it out of there without removing the powerhead.  Be sure to replace the oring and carefully apply OMC moly lube the the driveshaft splines prior to reinstalling the gearcase.

[JACQUES]

happy ending… the best ! actually the oring is thee to help keep water out  but a good greasing and new oring will go for years till you change the impeller again.

Joining AOMCI has priviledges 🙂

[Author]

Posts