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View Full Version : Water impeller ???



OutCole'd
04-03-2005, 07:53 PM
How many people here change just the impeller itself or do you replace the entire assembly, housing and all???

a catered life
04-03-2005, 07:56 PM
just had one done and i was told its a new kind with the housing and impeller all in one suppose to be a better unit :jawdrop: did i just say better unit

Phat Matt
04-03-2005, 08:07 PM
I think the type of engine has a lot to do with it.

franky
04-03-2005, 08:18 PM
An impeller is about $25, the whole assembly (housing, wear plates, seals) is about $70. As long as the housing looks OK and the wear plates are not all grooved out, you can usually just replace the impeller. However, for the difference in $, replace it all, the biggest hassle is the R&R. Always carry a spare pump kit. No water pressure, no go.. When you replace an impeller that has come apart or lost some pieces, make sure and backflush the oil cooler cause thats where the little pieces of rubber end up and you will have water flow problems (over heating).
That is assuming that you have the old style bakalite (sp?) style. If you have the new style like on the 496 your f@cked. The Pump housing is brass and is good for only 2-3 impeller changes (200 hours or so). Then you have to replace the grooved out pump at the tune of $500.

purrfecttremor
04-04-2005, 03:17 AM
i had to replace that ****ing brass housing at 30 hrs.now i have 67 total on
the boat. merc is supposed to be working on a better replacment.
the impeller should be replaced every year.

OutCole'd
04-04-2005, 06:55 AM
Anyone have a link to where I can order the assembly online for a 525?

LHC30Victory
04-04-2005, 08:38 AM
If anyone has an old housing (the 500$ kind) from the newer 496HO"s, I would be interested. A friend and I were talking about the cost of braizing and CNC machining them back to life but I don't have an old pump to work with.

OutCole'd
04-04-2005, 11:53 AM
rex will have it or aps-speed/mair @ the zoo
Problem is, boat is there, and I am here. The sales guy at Rex today says I need to know which kind of impeller I have on my motor.
I would think that all HP525's use the same impeller. :confused:

WYRD
04-04-2005, 12:19 PM
If anyone has an old housing (the 500$ kind) from the newer 496HO"s, I would be interested. A friend and I were talking about the cost of braizing and CNC machining them back to life but I don't have an old pump to work with.
You can refinish the plate side but the other side of this unit is too deep into the housing to mill.(did I just say the unit is too deep) :D I had a buddy who tried to re work his could not do it. so it is 500 bucks for a new one :mad: I have heard that merc is working on a replacment unit out of plastic(still needs to be replaced but much cheaper) or steel(much harder then brass but will rust) instead of the crap brass that they have now. all we can do is wait and see. :confused:

NashvilleBound
04-04-2005, 12:24 PM
Call Gary over at GT Performance he just shipped a spare out here to me....I think it was like $35ish. I always keep a spare.....Gary has the super whammy improved models too.

gmocnik
04-04-2005, 12:28 PM
always replaced the housing and impellor annually and keep a spare on the boat..this year am trying to gain some extra insurance and bought the KPM billet housing with a 1 hr (doubt it) run time impellor...pricey but it does look well built...gt carries them or trick marine (fred)

gmocnik
04-04-2005, 12:30 PM
nashville....
hope all is well with you and your family...we met a few years back at lake piru (i think)....if ever in so cal or havasu...give me a call
gary
949.433.0413

NashvilleBound
04-04-2005, 12:38 PM
Hey Gary...Hadnt seen you post lately. All's better than I could have asked...thanks. We'll be in San Diego for almost all of June... We should get some of us together... I might be in Havasu next week if Magic and I can get this deal together! Hows everything with you??? Still driving the 25 Daytona?
Jeff
(sorry for highjacking the thread)

OutCole'd
04-04-2005, 01:14 PM
Call Gary over at GT Performance he just shipped a spare out here to me....I think it was like $35ish. I always keep a spare.....Gary has the super whammy improved models too.
Anyone have a #?

WYRD
04-04-2005, 01:30 PM
heres your part#
I think he wants a phone # :idea:

OutCole'd
04-04-2005, 01:33 PM
heres your part#
Sorry, I meant a phone #

riverracerx
04-04-2005, 01:34 PM
I HEARD (key word is heard here) that someone back east makes an impeller out of some kind of blue rubber material which is supposed to be better, or guaranteed for something or other? But I never got more than that? Anyone got an inside line on info to this effect?
And I replace the impeller every season.

OutCole'd
04-04-2005, 01:35 PM
I think he wants a phone # :idea:
You have to remember, Mark has been drinking. :D

WYRD
04-04-2005, 01:39 PM
WTF do i have to do everything around here? :D i'm right in the middle of smoking a joint :rollside: MAN :notam:
Well that means you rolled the fukin thing too damn BIG!!!!Jeesh three hits or call it quits................. :idea: :D

phuggit
04-04-2005, 01:40 PM
I replaced my impellar about two weeks ago after 65-70 hours on it. I noticed some scoring inside the pump, so I think next season I will replace the entire unit. He he, I said unit.
One half of the pump
http://www.hotboatpics.com/pics/data/500/3701DSC02050.JPG
The other half
http://www.hotboatpics.com/pics/data/500/3701DSC02049.JPG
The new and old impellar
http://www.hotboatpics.com/pics/data/500/3701DSC02051.JPG
It was pretty deformed, but intact.

franky
04-04-2005, 02:45 PM
I replaced my impellar about two weeks ago after 65-70 hours on it. I noticed some scoring inside the pump, so I think next season I will replace the entire unit. He he, I said unit.
One half of the pump
http://www.hotboatpics.com/pics/data/500/3701DSC02050.JPG
The other half
http://www.hotboatpics.com/pics/data/500/3701DSC02049.JPG
The new and old impellar
http://www.hotboatpics.com/pics/data/500/3701DSC02051.JPG
It was pretty deformed, but intact.
Dude, that is pretty worn for that many hours! Run it in the sand alot? Shallow water? You will have to replace that pump next time for sure. If yo9u didn't haver closed loop cooling I would venture toi guesss that your block was sanding up and you wouold be having some hot spot issues. One big advantage to closed loop cooling!

phuggit
04-04-2005, 09:53 PM
180 total hours on the pump. 65 hours since the last rebuild.

Phat Matt
04-04-2005, 10:20 PM
180 total hours on the pump. 65 hours since the last rebuild.
Is that off a 496?

phuggit
04-04-2005, 10:50 PM
Yep. 496 mag.

NashvilleBound
04-05-2005, 03:40 AM
Anyone have a #?
If you have any troubles getting ahold of Gary I have his cell too if it helps you.

VelocityDriver
04-05-2005, 11:37 AM
I ordered one of these... http://www.trickmarine.net/productdetail.cfm?productid=369 $249.00 . Can be run dry and has a warrenty, can't say that about a Merc pump
http://www.trickmarine.net/images/productimages/1arebuildkita1.jpg

Phat Matt
04-05-2005, 11:48 AM
I ordered one of these... http://www.trickmarine.net/productdetail.cfm?productid=369 $249.00 . Can be run dry and has a warrenty, can't say that about a Merc pump
http://www.trickmarine.net/images/productimages/1arebuildkita1.jpg
Have you installed it yet? And for what engine?

OutCole'd
04-05-2005, 11:59 AM
If you have any troubles getting ahold of Gary I have his cell too if it helps you.
Thanks, I called them yesterday & got r done.

VelocityDriver
04-05-2005, 06:37 PM
Have you installed it yet? And for what engine?
It's installed, on a new 540. The Merc pump was an '88, bolted right up!

Mandelon
04-05-2005, 07:00 PM
Keep it out of the sand. Push off to deeper water before you fire up..... the aftermarket one looks trick.

phebus
04-06-2005, 08:01 AM
On the newer 496HO pump, is it just the impeller that needs replacing? From what I see, there isn't any wear plates. I am going to tackle mine this week, any tips on replacing the water pump impeller for the 496HO would be appreciated. Tight space I'll be working in.

Rev. Williams
04-06-2005, 08:46 AM
Just did mine a couple weeks ago. This is my first I/O and I never knew how important changing the water pump/impeller was until my risers were 10 degrees from melting !!!! :eek:
When I pulled it apart there was just a round wheel without a single vein on it.... When I back flushed the system I felt like I was on CSI, and I started to rebuild the impeller with all the pieces in my oil cooler hose.....
So now I'll have a back up Impeller, Prop, fuel pump, starter, belts and hose on board for each trip.... Damn this is getting to be a bunch of crap!!
I'm getting a canoe instead !!!

phuggit
04-06-2005, 09:40 AM
Phebus,
My 496 is a 2002. I bought a rebuild kit from West Marine in Havasu for ninety something bucks. The kit had the impellar, O ring and metal plates. I believe this kit was meant for the newer plastic raw water pump.
When I pulled my pump out, I noticed it wasn't the newer style pump. I returned the kit a bought the one which has an impellar and O ring only (30 sumthin bucks).
Changing out the impellar took me a couple of hours. One trick I picked up from the OSO boards is to close the vanes of the new impellar with a zip tie. It makes it a lot easier to fit into the pump and just cut out the zip tie once the impellar is in.
Have fun.

phebus
04-06-2005, 09:44 AM
Is it easier to replace the impeller with the pump in the boat, or do you remove it and do it out of the boat?

phuggit
04-06-2005, 09:57 AM
I've heard both. It was easier for me to remove the impellar from the boat, because the bracket blocks access to one of the bolts. All of the impellar bolts are accessed from the rear of the impellar. Three of the bolts connect the impellar to the bracket as well as hold the impellar together. One of the other remaining impellar bolts is blocked by the bracket, so I disconnected the water lines and just removed the whole pump.
Maybe this pic will clarify what I'm trying to say. Gimme a call if you want, or I'll be in the zoo this weekend if you need a hand. 951-906-3745.
http://www.hotboatpics.com/pics/data/500/370116-med.png

phebus
04-06-2005, 10:11 AM
Just so I understand what your saying, you removed the three accesible bolts, which removed the water pump, allowing you access to the remaining fourth bolt?
Also, you said you removed the hoses, but what method did you use to loosen the serpentine belt? Loosen tensioner, or loosen alternator?
Yes, I will be in Havasu this weekend, but think with tips like yours, and others, I think I will be O.K. Thank you very much for the offer of help, and if I really need it, I will give you a call.
Thanks,
Rick

phuggit
04-06-2005, 10:23 AM
Exactly. I couldn't access the fourth bolt while the pump was attached to the bracket. I loosened the alternator to remove the serpentine belt.
If you have someone with small hands to help, you might be able to access the "fourth" bolt after disconnecting the water lines. It's pretty tight and I couldn't get my hand back there to loosen it.

phebus
04-06-2005, 08:31 PM
ttt, any other help?

OutCole'd
04-10-2005, 07:42 PM
How do you loosen the tension on the serpentine belt on a 525?
Anyone have a clue?

phebus
04-11-2005, 07:20 AM
How do you loosen the tension on the serpentine belt on a 525?
Anyone have a clue?
Yea, I think you have to have your nose higher in the air then when doing the 496's, and use blue wrenches (Snap-On of course). :D
In all seriousness, here is a link of the install on 500's, and I think the 525's are the same. The tensioner runs in a groove, and if you loosen it, it loosens your belt.Impeler change 500's (http://www.speedwake.com/upload/showthread.php?s=&threadid=18967)

OutCole'd
04-11-2005, 07:25 AM
Yea, I think you have to have your nose higher in the air then when doing the 496's, and use blue wrenches (Snap-On of course). :D
In all seriousness, here is a link of the install on 500's, and I think the 525's are the same. The tensioner runs in a groove, and if you loosen it, it loosens your belt.Impeler change 500's (http://www.speedwake.com/upload/showthread.php?s=&threadid=18967)
:D
Thanks...

NashvilleBound
04-11-2005, 07:40 AM
:D
Thanks...
On my HP (I changed it two days ago even tho it looked fine) You just start taking bolts off. 4 of them are connected to the bracket. Leave the top inside one on but loose when you install so you can put tension back onto the belt. Very easy...I am sure the 525 is simular. Took me less than an hour...and I was trying to find my tool set most of the time...kids ya know.