Orientation of impeller blades

[NormanS]

A wipe with Fairy or similar, when inserting the impeller is just as good. All this anxiety about the impeller blades is entirely unwarranted. When the pump is working, the blades are dragged over the cam, and HAVE to take their correct position.

 

[ghostlymoron]

The direction of rotation is usually marked on the cover plate. The best way to insert an impellor is to push and twist in the direction of the arrow.

 

[RichardS]

Yanmar provide little tubes of glycerine to lubricate the impellor while dry. I assumed, as a previous poster pointed out, this was because silicon grease, or stern gland grease, could react with the elastomer. I nicked a wee bottle of the wife's icing glycerin ( don't tell her )

I though that stuff in the sachets was the very thin liquid silicone grease you can buy. Either way, I didn't use it as it's so thin that I thought it would immediately wash out from behind the Speedseal Life PFTE bearing. I used proper thick silicone grease which was still there behind the PTFE some weeks later.

Richard