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NJ2018T22

Impeller replacement 2018 T22 409 monsoon

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NJ2018T22

 Anyone do an impeller replacement on a new 409 monsoon yet... 2018 crusader 409..I have 90 hrs on it.says change every 50, so I guess it's time... I see the details in the manual, but confused if I need to adjust tension pulley and remove cam wheel, or do I use the 3 holes in the, pulley to unscrew the 3 bolts?  I just don't see how, after removing the bolts, I'll be able to remove the impeller with the front pulley wheel on?

Any help is greatly appreciated

Thx

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shawndoggy

So assuming you have the PCM pulley driven raw water pump (and not a shaft driven johnson style)...

take the belt off (loosen tensioner, remove belt).  EASY.

Leave the pulley on, but use an allen wrench to remove the three allen bolts from the raw water pump housing (IIRC, your wrench will go through the holes in the pulley to do this).  The three bolts are held in by little rubber washers and will "dangle" there on the pump face.  That's fine.  You don't need them all the way removed from the front side of the pump.

Once the bolts are loose, wiggle the pulley back and forth and the pulley and the front of the water pump will start coming out with the impeller on the pump shaft (which is attached to the pulley).

So unlike an indmar 350 engine, where the cover reveals the pump cavity with an imeller on a shaft, the whole shaft will pull out, with the impeller on it.  No need for an impeller puller.

It's REALLY easy and I've probably not explained it well.  Mucho easier than the johnson style water pump.  

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NJ2018T22

Thanks man, that helps a ton!!! 

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NJ2018T22

Just a post impeller follow up, whole job took about one hour, most time was spent removing belt cover and such.  The 3 bolts holding pump are 10mm and came right out. The impeller did however remain in the cavity when I pulled the pump off, no biggie, pair of needle nose, came right out.  I had 91 hours and the impeller was a bit deformed, but no too dry rotted.  It may have made it another season, but why risk it, so I'm glad I replaced it.  Thx shawndoggy..

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IndyFerg

Really glad I saw this...will pull this back out mid-late summer as I'll be doing the same thing for the first time.  Thanks to all for sharing the knowledge!

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onewake09

I read this post about an hour ago and decided I had nothing to do. I bought a spare impeller last fall and figured I’d wait til the off season to change. It was seriously easy. Took about 20 minutes. My impeller had a little wear but not bad. This is the first impeller change at 125 hours. Thanks for post this info. 

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ahopkinsVTX

Where did you guys purchase your impeller from? Looking to pickup a spare.

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shawndoggy
10 minutes ago, ahopkinsVTX said:

Where did you guys purchase your impeller from? Looking to pickup a spare.

Nautiqueparts.com is a good source especially if you are going to buy a fuel filter too. 

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onewake09

Bakes. Part number is RP061022. No puller needed. Comes with new large O ring and the 3 smaller ones. I reused my originals. They looked fine. Kept the new ones in the boat tool box. That part number is a OEM PCM part btw. I’m sure there is another brand but this is the one i found through bakes. 

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onewake09

That’s cheaper than bakes for sure. 

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WAKEMASTER

might be a silly question, but my buddy has the same engine with closed cooling system would there be 2 impellers? ( one for exhaust and 1 for cooling system?)

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shawndoggy
23 minutes ago, WAKEMASTER said:

might be a silly question, but my buddy has the same engine with closed cooling system would there be 2 impellers? ( one for exhaust and 1 for cooling system?)

nope, just one impeller.  the cooling system is closed (like your car) and the engine water pump circulates the coolant past the heat exchanger (a water-to-coolant radiator) just like the engine water pump circulates the coolant past your radiator (an air-to-coolant radiator) in your car.  The impeller circulates the water past the heat exchanger and out the exhaust in the closed cooling setup.

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