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Fish On! Guide Service

Impeller replacement 04 Yammy 40hp

6 posts in this topic

It's time to replace the impeller on my '04 40hp Yammy 2 stroke and I'm seeking help on what parts need to be taken off to get the lower unit free. I've replaced an impeller before, just not on this unit, so If anyone can give me insight as to which bolts (or other parts) need to removed to get at the impeller, that would be greatly appreciated.

Thanks in advance,

FOGS

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If you've done it before it's fairly similar - put the motor in gear, remove all the visible bolts that connect the lower unit to the midsection (probably 4). Then, remove the trim tab via the bolt on top of it in the mid section and remove the last bolt from under the trim tab.

That's it... remove the housing, replace the water pump and away you go...

marine_man

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Thank You Sir!

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Much easier then I had anticipated. 40 minutes tops time to replace the impeller and lube the splines. The last impeller I replaced was on a 2hp Johnson without forward-nuetral-reverse and this impeller replacement felt like it went much better then the last.

Is the purpose of placing the motor in gear to prevent turning of the spline when re-installing the lower unit?

Thanks,

FOGS

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The main reason is to help keep your gearcase in the correct gear - forward or reverse. Sometimes if you leave it in neutral it gets out of sync and it can be a hassle to get it all straightened out.

Glad to hear it worked out for you.

marine_man

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When installing a new impeller you will often turn the drive shaft anyway. when you go to reinstall the lower you can rotate the prop shaft to realign the splines. as well as keeping the unit in the correct gear. take caution not to move the shift shaft or shift the motor at the control end, once the unit has been removed.

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