New impeller stiff?

erikgreen

Captain
Joined
Jan 8, 2007
Messages
3,105
Hey all -

I've just about got my drive on my Sea Ray (pre alpha R drive)ready to go with its replacement lower thanks to the folks here... I got the two halves mated tonight and it looks like a drive again.

But I've noticed that the input shaft is moderately hard to turn - I can feel and hear the flaps on the impeller rubbing against the inside of the pump... both pump and impeller are new. I did put a little grease on the inside of the pump housing to help get the impeller on. I turned the drive shaft clockwise as viewed from the top when I installed the top of the pump housing to get the impeller blades pointing the right way. It all went together ok.

Is it possible the brand new impeller, seals, and water pump are creating a lot of friction on the input shaft? I did check the lower half before installing the new housing and the drive shaft turns the prop shaft nice and smoothly.

Also, should I run a pressure or vacuum test with oil in the drive, or dry as it is now?

Erik

PS: I just found out that I can't seem to shift into forward, although reverse works... gonna have to split the halves again and check the shift shaft.. it worked the first time I put 'em together, but I forgot the allen bolt near the zinc and had to split 'em again.... third try's the charm, right?
 

dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,333
Re: New impeller stiff?

yes, the impeller can cause friction and you will hear the veins moving in the pump assy

pressure test the drive DRY! if there is oil in it you will blow out seals

also, rotate the splined shaft and shift the drive fwd, n, rev while turning it to simulate how it will work when on the water

should hold 15 + psi for 10 + min
 
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