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98 25hp prop shaft

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Karl1964

New member
I have recently found out that what I thought was a 06 model is actually a 98 model. My net question is how much trouble is it to change the prop shaft seal. I have quite a bit of grease leaking from around the shaft and I plan on fixing that while I have the boat out of the water. Thanks
 
Hi,
If you remove the prop and thrust washer, you can then remove the propshaft holder. See the link below.:


The propshaft holder is held in the case by two bolts. See item 12.
It comes out of the case holding all the parts seen on the page except 7, 18 and 20.

While it's definitely possible to replace the seals (items 23) while it's still in the case, it's easier, in my opinion, to access and change them with the holder and transmission disassembled. That gets the propshaft out of your way. It's a very simple dog clutch type transmission and easy to take apart and reassemble.

The ease with which you'll have removing the holder assembly from the case is going to depend on the condition of the case.

If the case was left lowered in the water for any length of time, corrosion might present you with a problem. If not, it should be fairly simple to remove the two bolts and carefully pry it out an 1/8" or so and then slide it out. Just be cautious and don't force it at all. Those cases can break easily.

Also, tilt the nose of the case slightly upward when removing or replacing the holder to keep the shift pin and ball (items 5 and 25) from falling out inside the case.

The job is probably easier than it sounds.

Good luck.
 
The propshaft, along with most of the transmission components, comes out with the holder as an assembly and has to be"broken down" to get the shaft out of the holder and out of the way. I think most folks can disassemble and reassemble using the parts page attachment I sent you above as a guide. It's not difficult and no special tools required. However, I know not everyone will be comfortable trying to do that.

Once out, you can choose to disassemble the components for ease of changing the seals in the holder or leave the whole thing assembled and remove and replace the seals.

The problem with replacing the seals without disassembly is that you have to work around the propshaft which is a real hindrance. Especially when trying to press in new seals.

One option, if you find that the case is compromised due to corrosion and the holder doesn't want to come out is to "pick" the seals out while the holder remains in the case. You can then fashion a seal installation tool using PCV pipe to slip over the propshaft.

But, believe me, removal and disassembly is actually easier in the long run and gives the best opportunity to get the seals pressed in properly.

Don't forget to order a new propshaft holder seal (item 24 in the link) when you order the two shaft seals.

I also recommend ordering 2 new prop thrust washers (item 16).
One for now and a spare for later.

The reason I suggest a spare is that the thrust washer is a high wear item.

Monofiliment line wrapping around the propshaft of an outboard is a top cause for shaft seal failure. You should remove the prop periodically and inspect for that. Especially if you operate in regularly fished waters.

Inspection and replacement of the thrust washer can be done at that time.

Doing those preventive things will save you time and money.

Good luck.
 
jgmo said:
The propshaft, along with most of the transmission components, comes out with the holder as an assembly and has to be"broken down" to get the shaft out of the holder and out of the way. I think most folks can disassemble and reassemble using the parts page attachment I sent you above as a guide. It's not difficult and no special tools required. However, I know not everyone will be comfortable trying to do that.

Once out, you can choose to disassemble the components for ease of changing the seals in the holder or leave the whole thing assembled and remove and replace the seals.

The problem with replacing the seals without disassembly is that you have to work around the propshaft which is a real hindrance. Especially when trying to press in new seals.

One option, if you find that the case is compromised due to corrosion and the holder doesn't want to come out is to "pick" the seals out while the holder remains in the case. You can then fashion a seal installation tool using PCV pipe to slip over the propshaft.

But, believe me, removal and disassembly is actually easier in the long run and gives the best opportunity to get the seals pressed in properly.

Don't forget to order a new propshaft holder seal (item 24 in the link) when you order the two shaft seals.

I also recommend ordering 2 new prop thrust washers (item 16).
One for now and a spare for later.

The reason I suggest a spare is that the thrust washer is a high wear item.

Monofiliment line wrapping around the propshaft of an outboard is a top cause for shaft seal failure. You should remove the prop periodically and inspect for that. Especially if you operate in regularly fished waters.

Inspection and replacement of the thrust washer can be done at that time.

Doing those preventive things will save you time and money.

Good luck.
Click to expand...
That helps alot. Thanks for the info
 
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