bavboym3

I am having low water flow in my port side Engine. it is thowing my smartcraft into guardian Mode. Engine temps, and everything seam ok. just the H20 flow. I tried to flush out the front Heat Seperator, but no dice. Could it use an impeller maybe? Any Advise would be great. I am dead in the water.

-Mike

VoodooRob

Did you change the impeller and housing recently? Very important to change BOTH out a minimum of once a year on 525/600/700 to get maximum cooling and water flow. Buy spare sets and keep them on your boat. While your at it make sure you change fuel pump oil.

bavboym3

I replaced it two seasons ago. prob about 50hrs ago maybe. The engine isnt getting hot though? Could that still be the problem? I have a new impeller in my hand im going to install 2marro

VoodooRob

50 hrs is way too long on 525/600/700, you risk running headers hot and springing leaks. The headers will run hot before the engine runs hot. If your headers have "golding" on them, they have run hot and need to be pressure checked. You should pressure check them anyways as maintenance. As said before don't just do the impeller, you must do complete impeller and housing a minimum of once a season. The impeller/housing assembly "mates" together and only replacing one will not get you 100% performance from the parts. Don't forget fuel pump oil change too.

bavboym3

Thanks for the info. I will start making this a yearly routine. Do you think its why I lost H20 pressure?

This is the kit I got.

https://www.marineengine.com/newpart...ER46-807151A14

VoodooRob

Just be sure to buy genuine Mercury Impeller/Housing kits, you can order from any vendor out there. Schematics make it easy to look up parts in the future like at Bam Marine. Watch some YouTube videos on the actual install, you do not want to dry start the new impeller/housing the first time. Just do not use Vaseline. Dishwash soap very lightly or even a VERY light coat of water proof grease. There is water pressure and there is water flow. Both can certainly be affected by a bad impeller/housing. Make sure when you disassemble for service that all the "veins" are attached to the old impeller. If not you will need to back flush the system.

kennyd

iTrader: (1)

we have had the same issue with a 600 set up , sensor is known for failure and throws it into guardian also . swap the sensor and we are good for a season .

VoodooRob

^^^ This is another trouble spot, verify with your Rinda Scan Tool that you purchased because you want to maintain your 600 SCI to the best of your ability, right?

bavboym3

Which sensor is this? Where is it located?

bavboym3

Great advise thank you. Im going to change the Mercury Impeller/Housing while the boat is in the water. I always use dishsoap to lubricate it. I dont really think its a sensor cause when you start the boat you can noticably see that the one engine is not movine as much water. Also the port engine is not in sync with RPM's with right side motor when I give it a little throttle.