If you've run it dry, injested sand or other debris or the engine is overheating, you should look at the raw water pump first regardless of how long it's been in there.....
Assuming you are referring to your 2010 Larson in your signature.
Mercruiser says you should take the Alpha drive pump apart and inspect the pump after 300 hrs or 3 years, which ever comes first and replace the worn parts.
I couldn't imagine going to all that work to look at it, and replacing the gaskets (a must if you take it apart) and not put in a new impeller.
Thanks, think I'd want the kit to do everything # 817275K05.... Seems like something I'd do...with a manual. Dealer est $250, but has to see the drive or model/serial #'s for better estimate.. Did everything on my Volvo Penta, but that had external sea pump easy access..
The chances of the complete pump kit needing replaced in a 2010 boat is almost 0.
The housing is SS and lasts for years, don't go overboard for nothing. That carrier was a problem in the early Gen II drives, but unless it leaks, leave it alone.
Why are you going to take it to a dealer for an impeller? You came to this site to learn how to work on your boat didn't you?
Thank you Don S. for the Manuals.. The sealant they call for on the small hole gasket, I can use Permatex/Locktite Aviation Sealant ? And the spline lube?? Any other tips...
Do not use Permatex/Locktite Aviation Sealant on the orings. The small quad ring should be glued into place so it doesn't get bumped out of place, I use bellows adhesive.
