Who makes the best impeller?
 

Does Merc make a better impeller and housing than say Quicksilver?

Any suggestions on getting rubber chunks out of a 500 EFI? Changed the impeller and it still runs a little warm. Since the impeller exploded and it was fine before. Could these chunks make it to the thermostat?

Merc's 540 Bulldog went back to the 2 piece housing w/ wear plates. The impeller and housing seem to last longer. Both housings are plastic. Back to using 3 gaskets. Chunks may be in input side of engine oil cooler.

Find the hose that goes from the cooler(s) to the water neck. Disconnect it from the waterneck. Clamp it to a garden hose. Remove is from the raw pump.

Back flush it with full hose pressure. Chunks will fly out of it.

You're finished.

(do this at every impeller service)

Thanks,
Just found a waterflow diagram. Sounds like that will work.
Will this work well also with the sand clogs low water pickups are famous for?

No, you can fill your engine blocks with sand.

And that really sucks.

Whenever you change an impeller, count the number of pieces you take out. That way you'll know if you have any more stuck futher down in the system.

I thought that would be an extra security measure until the pieces were to small to put the puzzle back together.
This was on the beach. Hanging upside down in the engine compartment.

has any one here used the blue impeller by Globe Rubber Works, they claim you can run dry 15 min?

I have a blue from globe. It works good for me but my setup is not stock. I run full closed cooling with a bravo water pump. My cooling system starts to build pressure over 4200 rpm. Under 4200 rpm my cooling system will run at 10 psi or less. I have heard that the pressure might be a little less with the globe. I have lots of water and good cooling. I noticed no difference between it and the stock merc bravo impeller. I have not run it dry yet. I have smoked the stock ones on the hose. So far so good with the blue.

Dusty Times - can you post that wire diagram, or where you got it from? I need one also, missing some chunks also.

I run a bronze Jabsco on my boat. Bolts right in. $200 if you can find on sale. If you have the gen 5 style pump with the fuel pump drive, you might be able to buy the brass body and remaining parts from a Jabsco dealer. The plastic body pumps get scored badly by sand, and must be replaced if damaged or your new impellor will get chewed up. I bought about 10 stock pumps and parts in a package deal on e-bay for $400. 4 had good bodies , but I did get some brackets, pulleys , a gen 5 pump , etc... Why run an expensive engine with an inferior water pump? I'm very happy with the Jabsco:) BBB

Yeah B.T.W. The one piece housing totally sucks !
Try to run the one with the wear plates. Also I made gaskets out of shopping bag material. Trace out wear plates, and cut with an exacto knife. Sometimes it's hard to locate these gaskets , or the store failed to re-stock them, and they don't always come with an impellor. BBB

Re: Who makes the best impeller?
 

Of course its the Blue ones!

Merry Christmas

Matt Koenig
Globe Composite Solutions, Ltd

Re: Who makes the best impeller?
 

The best impellers were merc ones from about 1979. I got over 20 years and over 3000hrs out of the original impeller in my 1979 merc 228.......It never died, just set with less flow so the temp gauge started to wander a lot at varying rpm so I finally replaced it.

Re: Who makes the best impeller?
 

do you have a blue one for the cam drive pumps

Re: Who makes the best impeller?
 

I would also run a straightened coat hanger (or some people have used a welding rod) from the top down though the hiles in your oil cooler to shove out any really stuck ruber chunks-- I power flushed my cooler after a trashed impeller-- and still got some pretty large chunks of rubber out. just a thought...

Re: Who makes the best impeller?
 

I Would Like To Here More About The Sand In The Block. How Do You Make Sure That Is All Out. Thanks Ted.

Re: Who makes the best impeller?
 

kpm makes some great claims about their run dry setup

Re: Who makes the best impeller?
 

Merc and Quicksilver are the same thing. Just a different box and slightly different part number.

Re: Who makes the best impeller?
 

Blue impellers all the way. Don't leave home with out em!

Re: Who makes the best impeller?
 

i'm curious. impellers's are 20 bucks brand new from merc. they take 15 minutes to change. why wouldn't you just put a new one in every couple years or couple hundred hours like changing your oil or something ? why all this heartache over a nickle and dime part ? and you solve the " run dry " problem very simply.... don't run it dry. or if you have your head up your butt some day and do, you spend 20 bucks and 15 minutes and change it....

i don't see the big deal here. this sounds like the " i can get 203 shaves from my razor blade " days

EMAIL ME
[email protected]

THE BLUE IMPELLER ALLOWS FOR AN ALMOST UNLIMITIED NUMBER OF RUN DRY TIME SLICES OVER THE LIFE OF THE PART

THE 15MINUTE CLAIM IS A CONTINUOUS MEASURE FOR BENCHMARKING


PLEASE FEEL FREE TO EMAIL ME AT [email protected]

What happens to the plastic housing atfter 5-10 minutes? Would it not be scored from the heat and ruined?

Where is it we can get the blue ones again? I haven't visited this thought in awhile.

I don't "think" they make blue impellors for 496's . . . .

i don't think they make anything worth buying.

All I know is there has to be something better. I am on water pump number six this year. I have low water pick-ups; unfortunately, the water has been real low :rolleyes:

Everytime, the housing has needed to be changed! A couple of the impellers looked perfect, but the end of the housing was scored. That end needs to definitely seal or the pump will not prime! I am tired of replacing $100 housings when the impeller is supposed to be the sacrificial part.

And 15 min change time... Not sure what boat that's on, but it must be wide open for access to the pump. Most are, at best, a chore...if not deserving of a severe cussing to the builder who would not think ahead about serviceability.