Yet another reason to change your water pump!!!
 

Well, one of the first things I bought for the boat was a raw water pump assembly. I don't know the history on a new purchase, so better safe than sorry.

Well today I finally got around to changing the impeller and housing. I would say it was a good call.

Would you guys recommend flushing the system somehow before I install the new impeller and housing?

Thanks and enjoy!!

Change your water pumps!!
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YES ,,, BUT BACKFLUSH IT ,Start at the exhaust and do it as much as u can .

DO NOT RUN IT !!!!!!!!!!!!!!!!!!!!!!! It will clog up the block and u never find where !!!!:eek:

DAAAAAAAUUUUUUUUUUUUMMMMMMMMMMM:eek:

Just flushed the system, doesnt seem to be any blockages. I took the hose that goes to the riser from the thermostat housing, and put the garden hose in there and clamped it on, and just let it backflow. After it flowed for about 1 min, I blocked the line going to the other riser from the housing so I could have full water flow through the system. I did this using both riser hoses, and it is flowing very nice, and clean.

Anything else I should do before installing the pump?

Might sound a little off the wall but when Mine blew out last year I also used a shop vac which sucked all the loose pieces out. The water back flush should do the trick, but if its still apart it cant hurt

That pump was run with no water.

For about 5 plus minutes

May have been, I dont know. This boat has been out of the water for 7 years too so that cannot help things.

When I saw it run, it had water running to it and out of it.. How it worked I do not know, but I am 100% for sure remember it exiting the exhaust....

Scary scary, hopefully the headgaskets are ok. The motor fires right up, and has great compression in all 8...

Well time for the new pump, and I would say this one looks a little better....

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yes it looks a little closer to normal. But if you have it this far you should go ahead and change it as well. new impellor kit $20-$30 blown engine big bucks.

Oh yeah... Im glad I didn't decide to run the engine this way... :)

Anyone know if this is the correct rotation of the impeller? Since I couldnt tell from the old one, I didnt even think about rotation until I looked at the picture again.

Also, anything special I have to do when first starting this up? I keep seeing "priming" the cooling system? What exactly does that mean?

Hold the pump up to the engine near where it will mount and see which direction it turns. Then you know which way to put the impeller. Then look at the arrows on the back of the housing and put the hoses on according to the rh or lh rotation.

If you can, take the fitting off the intake side of the oil cooler. The pieces that get caught in there may not come out with backflushing.

Ok I will definitely flush the system again from the oil cooler lines also.

Regards to the water pump, is there anything you need to do for first startup like Priming or something... How to?

Thanks

If you have the pump apart put grease on the impeller blades. If not, the best thing to do is remove the pump intake hose from the transom and shove a garden hose in the intake hose to run it. This is priming at its best. But in reality you should be able to put the muffs on and run it without all that.

When you ran it on the hose, water was coming out of the exhaust because the water pressure of the hose was compensating for not having a pump. :drink:

That pump was run for awhile with no water. It even looks like it was started and cooled down and started again with no water several times. I use a little vaseline when installing a new impeller. No priming is needed when you stick the boat in the water and lower the foot water will be at the pump before you hit the switch. If you do not believe me pull off the supply hose while your boat is in the water and watch your boat sink.

I definitely want to run the motor before it goes to the lake, I still have to change drive and engine oil.. So I want to warm them up first. I believe you for sure about the water filling right up to the pump, it only makes sense that the pump will be even or below sea level once the boat is in the water.

I am not sure what the owner before did, thats why I am replacing all the maintenance stuff. Just did the bellows and gimbal, now the pump, and fluids/filters are next, once the boat is back on the trailer.

If u hook the water hose up and turn it on ,,just wait a wile ,,it will also reach the pump ,,i never primed a pump ,,5 seconds without water will not hurt an impeller !!

By the way ,,did u ship that thing yet ? LOL

DAWN dish soap works wel also for a pre lube.

Remember that if it is on the hose there is water pressure all ready in the system so the pump won't be dry when you fire it.

Hose pressure should usually bypass the impellor and actually make its way to the exhaust before you crank the engine. If it doesn't, bump the starter until it does. Should only take a bump or 2.

If you are really worried, All you need to run on the hose is the housing. You can take the impellor out and use the hose for pressure. Don't rev the engine very much since that is what dries them out and fries the impellor as the hose usually can not keep up with the demand of the impellor.

Good luck

Excellent... No there will be no revving. Just want to warm it up a bit to change the fluids, so I am not changing molasses.

I will do that, I have the dual muffs that supply water to both sides of the pickup, so I will just wait for water to start coming out of the exhaust, and bump the key if necessary.

The muffs are where "sometimes" comes into play. Do you have fresh water flush hose end on the boat?

It is not necessary, but a great convenience. If water doesn't start instantly with the muffs you might have to crank a second, but they will work just fine. I use them on my Magnum.

I am not sure if I do or not, as I am not exactly sure what the fresh water flush hose end is.???

You probably don't. I don't think I've ever seen a Baja come from the factory with fresh water flush. It would look like a female hose connection in the engine compartment that you could hook the hose too instead of using the muffs.

ok, no I definitely do not have that.