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Seized driveshaft

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Old 12-06-2018, 05:51 PM
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Default Seized driveshaft

I have 2016 300s with 210 hours. First had a “ won’t shift into gear” problem. Removed selector cleaned lubed and all good. Went to remove lower unit on port motor and it’s seized. These are my first zukes and I always replaced water pumps at 200 hours on my yamis and even mercs and never an issue. Now I hear I need to drop every year to lube shaft. Is this normal? Thanks
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Old 12-06-2018, 08:00 PM
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You sure you got all the bolts out? You took the 7th one out under the torque tab, right?

It's pretty well documented that this /can/ happen and the easy preventative maintenance task is to drop the lowers annually and lube the shaft. I'm surprised you'd have it happen in just 2 years, especially if the installing dealer greased them when they hung the motors. (I don't honestly know if that is standard practice or not) I do my own maint and the lowers have always dropped smoothly for me. In fact usually I'm struggling to hold them up when the last bolt comes out.

Last edited by Flot; 12-11-2018 at 05:04 PM.
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Old 12-10-2018, 09:15 AM
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is it normal? no.
do we hear about it more with Zukes? it seems that way.
I just had the same issue. One of the few times where I gave up and took it to the dealer. I couldn't get the thing to budge. Port motor dropped right out, like Flot said and like always happens with me, but the starboard this time was STUCK.
My service intervals are normal, I always grease the shaft/splines, but this time there was significant rust and gunk to keep it from releasing. No clue why.
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Old 12-10-2018, 06:59 PM
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Originally Posted by coores14 View Post
is it normal? no.
do we hear about it more with Zukes? it seems that way.
I just had the same issue. One of the few times where I gave up and took it to the dealer. I couldn't get the thing to budge. Port motor dropped right out, like Flot said and like always happens with me, but the starboard this time was STUCK.
My service intervals are normal, I always grease the shaft/splines, but this time there was significant rust and gunk to keep it from releasing. No clue why.

Did the dealer get it unstuck? What was the outcome?
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Old 12-12-2018, 09:03 AM
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Originally Posted by coores14 View Post
is it normal? no.
do we hear about it more with Zukes? it seems that way.
I just had the same issue. One of the few times where I gave up and took it to the dealer. I couldn't get the thing to budge. Port motor dropped right out, like Flot said and like always happens with me, but the starboard this time was STUCK.
My service intervals are normal, I always grease the shaft/splines, but this time there was significant rust and gunk to keep it from releasing. No clue why.
Very surprising to have a seized drive shaft on a 2016 motor but I guess it's possible. Definitely make sure you get that large 7th bolt out under the trim tab.
"Rust and gunk" at the driven gear/drive shaft interface usually means that the drive shaft seals in the mount oil seal cover are worn out or missing grease in that area.
Here are a few threads about stuck Suzuki LUs. Mine is the second one below - I had to cut the drive shaft to allow for removal on one of my '06 DF250's that I had before I re-powered in 2016.
Stuck lower unit Suzuki DF300
Tell me why I shouldn't pull the powerhead on my DF225 myself and save $$$$

BTW - I just did my 500 hr maintenance over the Thanksgiving weekend which included the water pumps. I've changed them at 100 hrs, 300hrs, and now at 500 hrs. I use a good coating of TefGel on the splines to prevent any kind of corrosion. I also add grease to the shaft seals using the Zerk fitting that is in the mount cover seal on my motor. The shafts slide right out each time so I think 200 hrs is a good interval for me.

Good luck!

Last edited by fly186; 12-12-2018 at 09:08 AM.
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Old 12-12-2018, 09:20 AM
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Originally Posted by fly186 View Post
Very surprising to have a seized drive shaft on a 2016 motor but I guess it's possible. Definitely make sure you get that large 7th bolt out under the trim tab.
"Rust and gunk" at the driven gear/drive shaft interface usually means that the drive shaft seals in the mount oil seal cover are worn out or missing grease in that area.
Here are a few threads about stuck Suzuki LUs. Mine is the second one below - I had to cut the drive shaft to allow for removal on one of my '06 DF250's that I had before I re-powered in 2016.
Stuck lower unit Suzuki DF300
Tell me why I shouldn't pull the powerhead on my DF225 myself and save $$$$

BTW - I just did my 500 hr maintenance over the Thanksgiving weekend which included the water pumps. I've changed them at 100 hrs, 300hrs, and now at 500 hrs. I use a good coating of TefGel on the splines to prevent any kind of corrosion. I also add grease to the shaft seals using the Zerk fitting that is in the mount cover seal on my motor. The shafts slide right out each time so I think 200 hrs is a good interval for me.

Good luck!
i think I had over 100 hours but less than 200 on this driveshaft since it was last dropped. Definitely not enough for me to think I needed to worry.
Luckily I didn't need to cut the shaft. But was fully expecting that to be the remedy.
I grease the splines every time I drop the LU.
And for the life of me, I cannot see if mine has the zerk fitting that was introduced somewhere along the way. Mine are late 2015/early 2016 motors.
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Old 12-12-2018, 10:01 AM
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If the boat is on a trailer or a rack with the motor tilted all the way up you can just see the zerk fitting on the rights side if you look up under the engine holder using a flashlight.
Getting at it with a grease gun pretty much requires that you remove the side and oil pan skirts.
My DF300s are early 2016's and they do have the fitting.
There are also some good pictures of the location on this thread: Stuck lower unit Suzuki DF300
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