Impeller Confusion-gctid813573

[alleng8304]

1986 Bayliner 2150, AQ 225D

Raw Water pump in my boat # is 856952 (on face plate) and impeller # for this pump is reported as 875811 as per dealer/

Tonight when I took out old impeller, the # is 3862465

Now I am really confused. Alsothye one I took out is 10 blades and 856952 is 12 blades.

Please help- overheating

[green650]

Hmmm...

https://www.amazon.com/repair-856952.../dp/B01MZHBJRH

[2850Bounty]

"alleng8304" post=813573 wrote:
1986 Bayliner 2150, AQ 225D

Raw Water pump in my boat # is 856952 (on face plate) and impeller # for this pump is reported as 875811 as per dealer/

Tonight when I took out old impeller, the # is 3862465

Now I am really confused. Also the one I took out is 10 blades, and 856952 is 12 blades.

Please help- overheating

[color]blue wrote:
Your boat/engine is approx 31 years old. Your crankshaft seawater pump may have been replaced by now.

OEM may have been Johnson.... or it may have been Jabsco!

Questions:

How many screws secure the cover...... 4 or 6?

Is the impeller splined to the shaft...... or is it keyed to the shaft?

How deep is the impeller cavity? In other words..... what would the ideal thickness of the impeller be IF it sat proud of the pump by .010" or so?????

I have a reason for asking these questions!

.[/color]