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I am trying to replace the impeller on my Yamaha 2CMH outboard and I can't get the impeller housing to slide off the drive shaft.

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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reddevil6
  • 1673 Answers

SOURCE: Hoover Elite II Model # u4689-910 Impeller replacement

I have had to use a dremmel tool to cut the plastic around the shaft, you can also something sharp and a hammer to break away the remainer of the fan. There are no threads on the fan so to keep truning it may or may not get it off. Just have to watch and not damage the motor shaft and housing.

Posted on Feb 05, 2008

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  • 11 Answers

SOURCE: pump seals

The impeller is threaded on to the shaft. The trick is to hold the shaft in order to untread the impeller. The surest method is to disassemble the back of the motor, exposing the opposite end of the shaft. There should be a spot to put a wrench in order to hold the shaft immobile. Then, it's simply a matter of unthreading the shaft. A strap wrench does a great job of holding the impeller without damaging it.

Posted on Jan 03, 2009

Fame_Guru
  • 483 Answers

SOURCE: Yamaha outboard motor manual

You got it :

http://www.yamaha-motor.com/outboard/service/viewmanuals/outboard_manuals.aspx

here !

Posted on Mar 20, 2009

  • 135 Answers

SOURCE: I have a 1979 Sears gamefisher 7.5 hp outboard

TRY TURNING THE FLYWHEEL TO HELP LINE UP THE SPLINES ...
OR PUT THE LOWER UNIT IN GEAR SO THAT WHEN YOU ROTATE THE PROPELLER THE SHAFT TURNS... THAT SHOULD HELP YOU LINE IT RIGHT UP


HOPE THIS HELPS

Posted on Aug 08, 2010

john224
  • 1378 Answers

SOURCE: I have a proline 1.5hp

Keep trying - It is stuck and will likely break but you have to remove it to change the seal. It is not uncommon to need to replace the impeller when the seal fails since the water gets behind the impeller shaft and rusts the metal causing the impeller to bind. If you still cannot get it free pull the motor thru-bolts and lock the rotor once removed from the motor in a vice. Use a large pair of channel locks to break the impeller free...replace it if necessary.

John

Posted on May 16, 2011

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You should change your impeller.
It is located at the top of the gearbox, around the vertical engine shaft.
First, disconnect the gear control. Underneath the steering bracket, you'll see a long nut with a counternut. ( Maybe you'll have to shift FWD or BWD to get better access ). Loosen the counternut 1/4 turn and then turn the long nut up ( 2 open box wrenches 10mm ).
Then remove the 4 bolts holding from lower to upper the gearcase ( just above the anti-cavitation plate )
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To reassemble the waterpump, grease the cup in the housing with PTFE or silicone grease, and while pushing the housing down over the impeller, rotate the shaft clockwise.
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put it in forward gear. Drop the lower off by releasing the bolts and nuts holding it holding the lower on. (one is hiding under the back pick up screen)- some models had a plug in the back top of the exhaust/intermediate housing hiding an allen head bolt pointing down.

Once released, put a protector in a vise and clamp the lower to the bench.

2 screws or bolts will hold the water pump cover on. (the drive shaft runs thru it) Clean the carbon and rust off the drive shaft will allow the pump housing and impeller off the lower. Retrieve the funny looking key drive which runs the pump.

Inspect the shaft, the lower unit oil for water. and find all the pieces of the water pump impeller which may have gone places they shouldn't have.- including the outlet tube from the power head. Check this by putting a tube on the end and blowing- you should hear and feel the pressure in the exhaust and tell tale hole.

Now take the model number , the old pump parts to the marina for a replacement. Do a side by side comparison at the marina so you get the right stuff. Check the inside drive of the rubber impeller and see if they are exactly the same.

NOW- put the new wear plate / gaskets and drive key on, hold in place with grease. Slide the impeller on the key and spin the drive in both directions to be sure it has the impeller and will securely turn it.

Put grease in the cup of the pump housing to prevent dry start and help seat the impeller blades. Spin the shaft as you lower the housing in the pump so the blades all face in the right direction (clockwise). Screw in the bolts. Grease up the seal the watertube goes in and the spline end of the drive shaft.

Up the hole it all goes, now you only have to spline the shifter (it hasn't moved has it?) The drive shaft and the water tube all at the same time.

Check the shifter for correct position and bolt it down

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Okay this is on total memory. The shift shaft for a lot of those engines goes right up through the pilot shaft and exits just in front of the block under the carburetor(s). You will see the **** linkage arm connected to this shaft sometimes it's double nutted. See if you can slide the lower unit back up to the housing and put a bolt in it to hold then undue the shift shaft linkage, Remove the bolt and drop the lower unit. Be careful of the water tubes and check make sure the rubber grommets are in place in the pump housing not on the tubes. Clean up the pump housing and install the new impeller kit.
Put the impeller down the shaft on top of the impeller plate, lightly grease the inside of the housing the impeller plate and impeller. Then lower the pump housing down to the impeller while turning the drive shaft clockwise lightly push down on the impeller housing. This will fold the impeller blades all in the correct position and provide lubrication to the pump until the water gets into the pump. To make life easier re-grease the drive shaft spline and the water tube grommets this will ad ease in reinstalling the lower unit. be careful to make sure you thread the drive shaft, water tubes and shift shaft all in at the same time. After installation you may find you need to adjust the **** linkage.

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Cheers, Timo.

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In the leg, undo the gear link and undo the bolts that hold the lower half of the leg on, they are above the water intake pointing up, don't forget the bolt neat the prop. Wiggle the leg off and put it on the bench. The drive shaft protrudes from the center of the water pump housing, remove the bolts and slide the housing off. When you replace the impeller make sure the fins are folded in the correct direction to avoid pinching. Be sure to align the water cooling pipes when reassembling the leg.

Cheers, Timo

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