I have a Johnson F4B-903
water pump on my
Yanmar 3GM-30F
diesel. I'm looking to do an annual
service on this
engine and want to replace the
raw water impeller and also carry a spare impeller. The previous owner has onboard a spare Johnson 810B impeller with a threaded pin inside. I'm seeing mention online of the Johnson 810B-1 impeller with a smooth pin and no paper
gasket? I'm confused about the difference between the 810B and the 810B-1 impellers and whether or not they are interchangable? Does an impeller with a threaded rod have to be replaced with another impeller with a threaded rod? Or does this not really matter? Is the 810B-1 just the newer and backwards compatible version? I'm not sure what's actually on my
engine yet because I haven't opened up the
water pump">raw
water pump yet. Just trying to figure out what to order.
Thank you!
From spxflow (parent company) website:
09-810B-1 F4 MC97 (for cooling)
Impellers | Johnson Pump - Marine | Product Detail