TexomaPowerboater

We wiped out a brand new impeller by not putting in any lube around the casing.

qaberdeen

i've lubed the casing, and all of that good stuff, yesterday i went and tightened all the clamps to limit the air pockets, then i went to check the impella, and a few pieces had broke off. so i decided to call it a day. but i've just picked up the new impella and this time it's going to be well greased with plenty of water.

this time should i fill the block, hoses with water and still run the garden hose thru the intake hose and try starting

would this work

ThruHull

add one of these, it was the best money I ever spent and have not had any impellar problems since...

http://www.go2marine.com/product.do?...F&WT.mc_id=gb1

Brad Zastrow

You on your second impellar? Have you looked for the pieces you are missing? The pieces could be blocking the water flow. I do not understand how running a hose on earmuffs will not prime the pump. I usually let the water run for a while before I start the engine.

88Fount33

I had these installed in 2003 on my twin application, after a couple of years, starboard engine one had the check valve stick closed and smoked two impellers before I figured out what had happened. Ripped the guts out of it and found the check valve sealing rubber "sticky" with slime build up. It was enough to keep the valve closed with the engine water pump sucking on it and thereby smoking the impeller. Ripped the guts out of both of them and now just use the "body" as a tie in point for the hose connection. Hose on full and engine idling and some excess water back flushes through the sea strainer but at least I don't smoke impellers from stuck check valves. When they work, they work EXCELLENTLY, but have to keep an eye on them to make sure the check valve opens when you first fire it up when sitting in the water.

BajaIceBreaker

Agreed...

ThruHull

I haven't had one fail yet but I am sure my time is coming. I have seen some people just install a T in the line which would be cheaper than the valve and help insure he is getting water to the pump when flushing on the hose.

qaberdeen

This is a brand new motor with new everything, it's seem's abit strange to me as well, but i'm going to check for blockages in the line but it should'nt because everything is brand new, i guess with water already in the line might help to prime the system i guess, but at this time i will try anything, all the hoses r run the same way that it was rigged on my 7.4l MPI, other than the fuel cool system since i've gone with the carb seup..

thanks again. the input has been great

qaberdeen

thanks Daredevil

BajaIceBreaker

I'm not sure how your boat is rigged... but most boats put the impeller pump as the first gadget conneced to the intake hose (unless you have sea strainers). So if you put muffs on the drive, it will take 2 seconds to get water to the impeller, but it will still take more than 30 seconds to fill the block, exhaust, external coolers and intercoolers.

So yeah, if your boat is rigged so that the water comes to the sea pump after it goes through the block.. then your f'd!!!


I guess the question is... "Why do you think it's not getting water?" Is it because nothing is coming out of the exhuast?