Water pump issues!!!
 

Went out today and tested for 10 min. and smoked another water pump. Has anyone had any problems with water pump failers on 525. motors? This could be my fault on the insalation with the wrong rotation but we went through 3-4 impellers in 2 years. Trophy ***** says he swears he did it by the book!!! :D
MD

Re: Water pump issues!!!
 

Warm up your sponges. :p

Re: Water pump issues!!!
 

Check the hose in the transom assembly. I have seen them pushed up by water pinching it between the bellows and bell housing. I have also seen them pulled out of the "groove" around the bellows area on the main housing. If the hose bends or pinches out of round with the engine running fast, it can suck the hose shut and won't pop back until the engine is shut off, causing quick impeller failure. These events happen more often with stand-off boxes.

Re: Water pump issues!!!
 

does the sea strainer have a relief valve in the top? is the top of the strainer clear? I would watch the strainer for a lot of air bubbles , it might not be a restriction but an air leak. temporarily replace the drain plug on the sea strainer with a barbed nipple and connect a pressure / vacuum gage to find out what is going on in the system before the pump.
one other thing is do not use grease to install the impeller use liquid dish soap.just some stuff to look at.

Re: Water pump issues!!!
 

Candy,
It really seems to me, that it is DEFINITELY the throttleman's problem... I am sure in some way, or some how, you are doing something wrong... :rolleyes: :D It's got to be you.

Re: Water pump issues!!!
 

Mad Dog, go to Smittys and ask him to put the pump in!

Re: Water pump issues!!!
 

What does your water pressure gauge read....before the pump smoke checks?

Julie

Re: Water pump issues!!!
 

Try switching the the Bulldog style seawater pump. Its like the old style w/ wear plates on both sides of the impeller. Part# 46-72774a89 body/impeller kit, rear cover 87631a4, wear plate 94916, wear plate 94576. I switch all 1 piece style pumps to this version and they take alot of abuse.

Re: Water pump issues!!!
 

Check the front bearing,replace housing.

Re: Water pump issues!!!
 

Take the pump off and just go fast

Re: Water pump issues!!!
 

Put the cow bell back in the boat!

Re: Water pump issues!!!
 

Maybe he has cow shi@ stuck in the intake

Re: Water pump issues!!!
 

I have installed the impellers with WD-40 spray. Why is soap better? The sea strainer is clear but doesn't have a pop off pressure top. At speed the boat bury's the water pressure guage.
Thanks for all the ideas to check on!
MD

Re: Water pump issues!!!
 

maybe this is a dumb question.Is it legal to change the water pump in SVL,to an after market one?

Re: Water pump issues!!!
 

Wil,
According to OSS rules, on Pg. 18 in the Tech Rules, it does state: "no engine modifications are allowed"... etc. And the paragraph above references the cooling system too.
Here is the link: http://www.offshoreonly.com/forums/f...splay.php?f=76

Hope that helps.

Ben

Re: Water pump issues!!!
 

randy,I fired mine off yesterday and the pump was spewing water from a crack in the housing,maybe I have found that mystery leak?

Re: Water pump issues!!!
 

Those 1 piece housings suck. They use the plastic housing for an end plate instead of a stainless plate. Thats were it burns/wears, after a while the impeller takes a sh$t. Have done 6 or 7 Fountain Lightnings w/ 500/525 efis. All have not had impeller failures any more (unless started dry or tons of hours).

Re: Water pump issues!!!
 

Al, wouldnt that make sence. That was a hard one to find!
MD

Re: Water pump issues!!!
 

team ettore had the same problem last year.we fried 4 impellers in 2 races.what we did was made sure there was no debris from the nose cone to the pump.you have to clear this out we found rubber chunks in the line and was affecting pick up.we also had the inside of the hose come apart and created somewhat of a check valve and was letting very little if any water through.flush line both ways in n out to clear debris. ettore 75 2003 super v world champions

Re: Water pump issues!!!
 

crichdsn has good points I have seen those same problems( on other boat) the only other thing is runnning dry ie sucking air somewhere, kinked hose etc, don't get hung up on rotation if you did bend the vanes over the wrong way as soon as you turned the engine over they would flop over the correct way ( when they are new they don't have a set) any problem with installation would be apperant at sart up ifyou don't have water spitting out the dump there is a problem. Ours has 5 lbs at idle and I had to put a huge pop off dump to keep on the gauge at speed . if while running you are showning anything over 15 lbs at speed its not the hose kinking so I would look for an air leak somewhere if you have a pop off valve on your sea strainer look there I had a one way valve leak on ours when we ran the cat and we would run fine all day then come back in the no wake and cook a impeller at idle
oh by the way I was just having fun on the three word post and got carried away no offence intended Larry

Re: Water pump issues!!!
 

I've had a pump housing develop a grove or two that looked like it was molded in the housing from the factory, It wans't until I put it next to a new housing that I saw the difference, for some reason it was eating up impellers.

Eddie

Re: Water pump issues!!!
 

All of Merc's big motors (800,900,1000sc), run the pump w/ 2 stainless wear plates instead of 1 too. I can guarantee you that this style pump will last much longer.Never had too many problems till this 1 piece plastic body pump showed up.Even small motors 5.0/5.7 Mercs are having problems w/ longevity of 1 piece pump housing and impeller.

Re: Water pump issues!!!
 

Seems silly for Merc to use this kind of crappy pump, especially if they offer a warranty on the motor.

Re: Water pump issues!!!
 

yes randy,it would,it sure would be nice for that to go away!

Re: Water pump issues!!!
 

again- why use dish soap not grease or wd-40 on the impeller? I thought dish soap as well as grease or oil has a negative effect on rubber.

Re: Water pump issues!!!
 

randy,she was cracked staight inbetween the inlet and outlet fittings,am testing tommorrow will see if she stays dry,all I can figure is maybe she was cracked and the pounding made it leak,thats something you and I couldn't duplicate that night,and it just got bigger, I have had those hoses off and looked and didn't find anything!

Re: Water pump issues!!!
 

Striped the cooling system apart and found what I think was the problem. The Gimbel hose that kinked in the first place may have been loose on the top side in the extension box. After taking the drive off and Gimbel helmet and Gimbel bellow we pulled on the hose and it came out. Im hopeing it was sucking air and that was the problem. We reinstalled all the components and went for a test run yesterday. Ran the boat hard in 4-5' seas and had no problems. Thanks for all the help guys!!
MD

Re: Water pump issues!!!
 

Better check your oil cooler for pieces of impeller packed in there.

Re: Water pump issues!!!
 

jc has a very good point check the next cooler inline from pump we had that problem pieces of impeller reduced flow to engine your liable to heat up and go into guardian mode( wouldn't that suck with 2 laps to go) see you guys in KW

Re: Water pump issues!!!
 

Thanks, we found all the pieces of the impeller. The odd thing was that they were not burned from heat but more or less broken off. Im just praying that was it.
MD