How to Replace Yamaha F225 Input Shaft Oil Seals

Replacing the input shaft oil seals and the input shaft bearing in a Yamaha outboard is relatively simple. 

Follow the steps below, and watch the Yamaha F225 input shaft seal replacement video above for reference while you work on it.

Tools and Parts Needed – Yamaha F225 Outboard Input Shaft Oil Seal and Bearing Replacement

Tools

  • Ratchet and extensions
  • Socket set
  • Flathead screwdriver
  • Bearing housing puller tool
  • Bearing driver set

Yamaha F225 input shaft oil seals replacement

Removing Yamaha F225TXRC Input Shaft Oil Seals & Bearing

Step 1. Remove the lower unit from the outboard by taking off the five mounting bolts (two on each side, and one under the trim tab) and pulling the lower unit out. 

Watch our Yamaha F225 outboard lower unit disassembly video below to see how to break down the lower unit.

Step 2. Remove the four bolts and washers from the water pump housing. Use a flathead screwdriver to pry the housing off the lower casing, being careful not to scratch the mating surface of the housing. Inspect the two pump housing O-rings and replace them if necessary.

Yamaha F225TXRC water pump housing

Step 3. Remove the metal cartridge that houses the impeller.

Yamaha outboard input shaft oil seals replacement

Step 4. Pry the metal drive shaft collar off the top of the impeller using a flathead screwdriver, being careful not to damage the nylon spacer beneath it. Next, remove the nylon spacer and the three washers. 

Yamaha F225TXRC drive shaft collar

NOTE: If you damage the collar or washers or if they’re worn out, buy the replacement Yamaha F225TXRC water pump parts here.

Step 5. Remove the impeller, and use a hammer and flathead screwdriver to tap out the woodruff key from the drive shaft.

Yamaha F225 input shaft oil seals change

Step 6. Remove the cartridge plate, the water pump gasket and the two dowel pins.

Step 7. Remove the four bolts from the bearing housing.

Yamaha F225TXRC bearing housing removal

Step 8. Pry the bearing housing off the lower unit. 

Yamaha F225 outboard bearing housing removal

If the bearing housing is in good condition, you should be able to pry it up and off the lower unit using a screwdriver. However, if the bearing is corroded and stuck in place, you'll have to use a bearing housing puller tool as follows:

Position the puller's jaws on either side of the bearing housing, then hold the jaws against the housing and pull the puller's handle up so it hammers against the top of the puller shaft.

Yamaha F225 bearing housing puller

If the bearing housing still won't break free, use a blow torch to heat the housing, then try the bearing housing puller tool again.

Yamaha outboard bearing housing removal

If the bearing housing still refuses to move, use a hammer and chisel to rotate the housing and break it free, then try the bearing housing puller tool once more.

Yamaha F225TXRC bearing housing puller

Replacing Yamaha F225TXRC Input Shaft Oil Seals & Bearing

Step 1. Clean the lower casing, the driveshaft and the driveshaft splines with contact/brake cleaner, and remove as much dirt, debris and old grease as possible.

Step 2. Install the new bearing into the new bearing housing using a bearing driver. 

PRO TIP: If you don't have a bearing driver set, use a socket that has a slightly smaller diameter than the bearing itself. The bearing must be recessed between 4.25mm and 4.75mm within the bearing housing. 

Yamaha F225 input shaft bearing adjustment

Watch the clip below to see how to complete this step.

Step 3. Install the two new oil seals into the bearing housing, again using a bearing driver or a similarly-sized socket. 

NOTE: Once installed, the seals should be recessed about 0.5mm below the edge of the bearing housing.

Yamaha F225 bearing housing oil seals

Step 4. Install a new O-ring onto the bearing housing, lightly grease the O-ring and the outer surface of the bearing housing, pack the oil seals with grease, and oil the bearing.

Yamaha F225 bearing housing preparation

Step 5. Install the bearing housing into the lower unit with the notch in the housing facing toward the front of the outboard.

Yamaha F225 lower unit bearing housing

Step 6. Apply a drop of blue threadlocker to the four bearing housing bolts and reinstall them.

Yamaha outboard input shaft oil seals replacement

Step 7. Install a new oil seal cover.

Yamaha F225TXRC input shaft oil seals replace

Step 8. Reassemble the water pump, then reattach the lower unit to the outboard and you’re done. 

 
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COVER, OIL SEAL
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