496 Seawater pump
04-23-2010, 09:33 AM
#11
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Here is a post I made recently in regards to my Velocity 260 Impeller. What a pain in the a$$!
http://www.offshoreonly.com/forums/v...496-260-a.html
http://www.offshoreonly.com/forums/v...496-260-a.html
04-24-2010, 12:07 AM
#12
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Hey guys:
I know taking the raw water pump apart on the engine down in the bilge in that tight spot is a ***** on may boats.
I would reccomend taking of the serpentine belt, removing the two 10mm nylock bolts that hold the raw water pump bracket to the front of the block, loosening the hose clamps and the two hoses and pulling the whole pump and bracket off to the front. You could then easily remove the impellor and in spring re-install the pump and bracket complete.
Merc did not engineer this pump and location with the poor wrench in mind obviously!
Just a thought.
Best Regards,
Ray @ Raylar
I know taking the raw water pump apart on the engine down in the bilge in that tight spot is a ***** on may boats.
I would reccomend taking of the serpentine belt, removing the two 10mm nylock bolts that hold the raw water pump bracket to the front of the block, loosening the hose clamps and the two hoses and pulling the whole pump and bracket off to the front. You could then easily remove the impellor and in spring re-install the pump and bracket complete.
Merc did not engineer this pump and location with the poor wrench in mind obviously!
Just a thought.
Best Regards,
Ray @ Raylar
04-24-2010, 12:43 PM
#13
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I replace my impeller last year and had the same problem with the scoring on the housing. It did affect my water flow. I noticed that there was a little less comming out the exhaust. I replaced it with this kit http://www.jcmarinellc.com/water_pump_kit.htm
Good kit and easy to install. I noticed a difference even on the hose. Can't wait to put it in the water.
Rob
Good kit and easy to install. I noticed a difference even on the hose. Can't wait to put it in the water.
Rob
04-24-2010, 07:12 PM
#14
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Ray's removal advice is right on. Take the ENTIRE bracket off with pump attached. WAAAAYYYY easier.
I can do two motors in a little over an hour.....with only about a foot of clearence in front of the motors.
I can do two motors in a little over an hour.....with only about a foot of clearence in front of the motors.
04-26-2010, 12:49 PM
#15
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Hey guys:
I know taking the raw water pump apart on the engine down in the bilge in that tight spot is a ***** on may boats.
I would reccomend taking of the serpentine belt, removing the two 10mm nylock bolts that hold the raw water pump bracket to the front of the block, loosening the hose clamps and the two hoses and pulling the whole pump and bracket off to the front. You could then easily remove the impellor and in spring re-install the pump and bracket complete.
Merc did not engineer this pump and location with the poor wrench in mind obviously!
Just a thought.
Best Regards,
Ray @ Raylar
I know taking the raw water pump apart on the engine down in the bilge in that tight spot is a ***** on may boats.
I would reccomend taking of the serpentine belt, removing the two 10mm nylock bolts that hold the raw water pump bracket to the front of the block, loosening the hose clamps and the two hoses and pulling the whole pump and bracket off to the front. You could then easily remove the impellor and in spring re-install the pump and bracket complete.
Merc did not engineer this pump and location with the poor wrench in mind obviously!
Just a thought.
Best Regards,
Ray @ Raylar
Once again, thanks Ray!!
04-26-2010, 02:03 PM
#17
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I have the same pump on my 6.2 and I pull my pump and replace every other year, my housing looked exactly like the one in post #1, I simply machined it down and made the outside housing smooth again, and yes how bout you guys changing this pump in a donzi classic 18? It is no 30 min job to say the least, battery, manifold, riser all come out 
and it's still a PITA! However my water pressure did rise after smoothing out the housing, if it looks worn next time I replace the impeller I'll be installing a strainer.
and it's still a PITA! However my water pressure did rise after smoothing out the housing, if it looks worn next time I replace the impeller I'll be installing a strainer.
04-26-2010, 08:16 PM
#18
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I have the same pump on my 6.2 and I pull my pump and replace every other year, my housing looked exactly like the one in post #1, I simply machined it down and made the outside housing smooth again, and yes how bout you guys changing this pump in a donzi classic 18? It is no 30 min job to say the least, battery, manifold, riser all come out and it's still a PITA! However my water pressure did rise after smoothing out the housing, if it looks worn next time I replace the impeller I'll be installing a strainer.
and it's still a PITA! However my water pressure did rise after smoothing out the housing, if it looks worn next time I replace the impeller I'll be installing a strainer.
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