Undersize Impellers

[Devilman]

Saw this listed on PB:
Undersize Impeller Kits


Anybody have any thoughts, what would be the reason for an undersize impeller? Or are these considered "blems"?

 

[SlowRyd]

I'm sure its more of a casting flaw issue, the impellers probably would not machine up perfectly true at standard size so they went an extra .010 to .015 to get them trued up.  Nothing wrong with them as long as you don't mind running the undersized wear ring. It will work fine

 

[Devilman]

I got ya... One of my plans this fall/winter is to get the pump apart & see what kind of shape its in. It seems ok, but I have no knowledge of what condition it may be in from any previous owners. Its on its 4th season with me & so far I haven't done anything to it other than grease it & top the oil off every now & then.

Thanks for the info....

 

[KONA77]

That's i'm doing after plowmans,  i'm afraid i will have to do some impellar work myself,  loosing top end

 

[KONA77]

me three , pump is coming apart this winter :smile15:

copy cat  :smile16:

 

[KONA77]

i received the gaskets, and seals yesturday,  now trying to decide if i want to pull the bowl and replace or wait after plowmans  :undecided:

 

[sturat]

i received the gaskets, and seals yesturday,  now trying to decide if i want to pull the bowl and replace or wait after plowmans  :undecided:

I would wait might find something you do not want to find right now. just my .01

 

[KONA77]

i received the gaskets, and seals yesturday,  now trying to decide if i want to pull the bowl and replace or wait after plowmans  :undecided:

I would wait might find something you do not want to find right now. just my .01

i would agree also,  but would hate to tear something up not having a look see,  i'm pretty sure the problem is in the impellar and wear ring  :smile14:

 

[KONA77]

oh and the bowl gasket looks like it is trying to blow out,  and water getting into the oil,  me don't like that.

 

[Devilman]

Bowl gasket isn't gonna fix that... I agree with the others, I wouldn't fool with it for one more outing, if you're just gonna take it apart afterwards anyway... I'd top off the oil & call it good if it were mine.

 

[TahitiRat]

Looks like all the cool kids are doing there pump this winter.n Im doin mine and the boat is goin to get a little att. from Gary Snow this winter  :smile15:

 

[Patchman]

If the water is getting into the bowl, I would consider putting some Lucas oil treatment in it. I think it would stick around a little longer. According to the web, the water really won't hurt it as long as some oil is present, and you don't let it remain there all winter. Hopefully it won't be up to you and me to represent the South and our hardware! :smile16: :smile16:

 

[KONA77]

If the water is getting into the bowl, I would consider putting some Lucas oil treatment in it. I think it would stick around a little longer. According to the web, the water really won't hurt it as long as some oil is present, and you don't let it remain there all winter. Hopefully it won't be up to you and me to represent the South and our hardware! :smile16: :smile16:

your right patch,  that is all i have ever used  :smile15:  :smile22:

 

[KONA77]

Looks like all the cool kids are doing there pump this winter.n Im doin mine and the boat is goin to get a little att. from Gary Snow this winter  :smile15:

well if i have any money this winter ....  i have a few things i want to add to the pump also  :smile20:

 

[sturat]

Remember
THE POWER IS IN THE PUMP

 

[Patchman]

Has anyone used a stuffer? For the pump bowl, I know I have to be clear around hear! :smile13:

 

[Devilman]

This is how it was told to me when I asked about them:


i likes me a stuffer...  they work kenny, the bowl fills faster when ya mash the go pedal. some guys say they can't tell, i say they don't know their boat very well. gotta be a reason the fastest boats in the country are runnin stuffers


I figure I'll get one, damn sure can't hurt... :wink:

 

[kdub]

Water in the bowl bushing area is not going to hurt anything as long as it is in the water, dominator bowls are water lubricated, the problem with water getting in to a berk bowl is that sand tends to get in with it and cant get out causing shaft wear and bushing wear to be accelerated. I would change bushings and seal at LEAST every 2 to 3 seasons and run NO heavier than 90 wt gear lube, I suggest around a 50 wt oil and no grease unless the seal has a snap ring. Undersize impellers are fine to an extent, kinda like a brake rotor ( not really) but you can get replacement WRs down to .060" under but you need to be aware of how much material is left on your particular piece and how strong it will be and if you are willing to risk your life, pump, motor and boat on it, just saying KDUB

 

[kdub]

Stuffers dont actually stuff anything, the idea is to tighten the clearance between the bowl and the back of the impeller and smoothe transition of water as it changes direction coming off the impeller and into the bowl. Correct fitment of the impeller to bowl (vane to vane) is key. that is one of the greatest inneficiencies i see in pumps is improper clearances ( no blueprint). Just my .02 KDUB

 

[jetboatperformance]

I'm sure its more of a casting flaw issue, the impellers probably would not machine up perfectly true at standard size so they went an extra .010 to .015 to get them trued up.  Nothing wrong with them as long as you don't mind running the undersized wear ring. It will work fine

Good call Slo , suspect this is very likely the case (although we're not a Berk oem) Contrary to what one might think ,due to variences in machinery and operators not everything comes out as planned (machining)  Berk has likley "cleaned" these up and is offering them as a budget alternative for folks We remachine several Impellers a season to undersizes for various reasons , nothing wrong with this unless the undersize gets below .025 (IMO) That said if anyone needs and impeller and is to the piont where a few bucks makes the difference , give us a call we'll always "work" with you Guys Tom