Reply To: RD-17 water pump update PN

[frankr]

Mumbles wrote:

I’m showing 379774 (sierra 18-3006) as the P/N for the complete kit with housing for ’55 and 391741 being used on ’74 – ’76 40 horse motors. I’ve never seen or heard of an updated housing or impeller for these motors but I could be wrong. You wouldn’t be thinking of the upgraded pump kits for the 5.5-6-7.5 horse motors would you?

391741 for 40hp 74-76 is what I came up with, thinking it would fit the old RD’s. But then I changed my mind, thinking the drive shaft diameter is different. True or not true?