Impeller Replacement

[Troy_from _Oz]

Hi folks, I have just changed the impeller on my '71 merc 650 (4cyl) and wondered if I should have bent the vanes in one direction (which direction?) before replacing the pump housing. I searched in the forum and in some instances its suggested that you need to, and other posts say that the vanes will sort themselves out. Should I drop the l/u again and check?<br /><br />Cheers<br />Troy

 

[tmcalavy]

Re: Impeller Replacement

I've heard the vanes on a newly installed impeller will straighten and follow the clockwise rotation of the shaft, even if they are pointed backward when the pump housing goes on. Makes sense...the vanes are flexible rubber when new and the shaft turning should pull them in the right direction. Next time put the impeller in the lower housing and turn the shaft clockwise as you work the upper housing down over it. Works great for me.

 

[wilde1j]

Re: Impeller Replacement

The vanes will be forced in the correct direction at the first start. Don't worry.

 

[Trent]

Re: Impeller Replacement

Just as Wildone and Tim said...No worries! They will correct themselves!

 

[Troy_from _Oz]

Re: Impeller Replacement

Ok, Thanks for letting me know that it should be alright. As per usual...it wasnt until I had bolted it all together (and was basking in the amazement of not breaking anything up until that point that wondered if I had done the wrong thing with the vanes. I'll remember to turn the shaft next time to be sure. Thanks heaps..<br />Troy

 

[Walker]

Re: Impeller Replacement

The impellor is actually offset from center in the housing, so on one side the vanes can straighten out almost completely. As the pump rotates the vanes must bend as the edge gets closer to center. When the vanes bend the area between them decreases thus creating water pressure and the water is forced out of the housing into your cooling system.