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Anonymous Posted on Jan 23, 2011
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I have bought several of the MQ3-45 pumps. Most have them have had no prblems. I recently bought three more and installed one in my house and two in another. All three have had water leak into the control panel. I returned one and a month later it is doing it again. I dried it out but it won't start, just make's a humming sound now. Thank's for any info, these pump's are all in door's

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  • Anonymous Jan 26, 2011

    the pumps are all new, talked to an expert, said they will sweat and will fill the switch chamber with water which goes down into the motor. I see the new improved models have addressed this problem with drain holes, they said to try and kick start it with a screwdriver, no luck, changed the capacitor, did'nt work. I live in the Bahamas. I've installed several of these pump's and have never had this problem, one has been in 5 years. ????

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Mike Goody

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  • Contributor 22 Answers
  • Posted on Jan 24, 2011
Mike Goody
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That's odd - are the pumps new and unused? if so speak to your nearest Grundfos expert - What part of the world are you in?

  • Mike Goody Jan 28, 2011

    Hmm, Grundfos is a very highly regarded organisation and on the basis of what you say it seems to me that they have a question or two to answer here. I haven't experienced the problems that you describe with moisture or condensation entering the electrics; but on the other hand we have only sold a small quantity of this model. If the motor won't respond to new condensor or hand starting I'd say that the windings are u/s. Why don't you email Grundfos direct - I tried looking for a Grundfos agent in your area, but was referred to their office in Spain, which doesn't seem right. Go tohttp://www.grundfos.com/nav/contact.html... and put the question to them direct - I'd be interested to hear the outcome.
    Mike G

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How to replace the water pump
Water Pump
REMOVAL & INSTALLATION
CAUTION
Never open, service or drain the radiator or
cooling system when hot; serious burns can occur from the steam and hot coolant.
Also, when draining engine coolant, keep in mind that cats and dogs are
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should be reused unless it is contaminated or is several years old.

2S-ELC Engines

  1. Drain the cooling system.
  2. Remove the timing belt as described in this section.
  3. Remove the alternator adjusting bar.
  4. Disconnect the lower radiator hose from the water inlet housing.





    Fig. 1: Exploded view of the water pump mounting
    89553g42.gif



  5. Disconnect the water temperature switch from the water inlet housing.
  6. Disconnect the water by-pass hose from the water pump.
  7. Remove the two heater pipe clamp bolt. Remove the two nuts and heater pipe
    with gasket. Replace the gasket.
  8. Loosen the three water pump mounting bolts in the indicated sequence.





    Fig. 2: Water pump bolt loosening sequence for 2S-ELC and 3S-FE
    engines
    89553g43.gif



  9. Remove the water pump and O-ring. If the water pump is stubborn, tap it a
    few times with a rubber mallet.
  10. Installation is the reverse of removal. Make sure all the water pump and
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  11. Install the water pump with the three bolts. Tighten the bolts in sequence
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  12. Fill the cooling system to the proper level with a good brand of ethylene
    glycol based coolant. Start the engine and inspect for leaks.

3S-FE Engines

  1. Drain the cooling system.
  2. Disconnect the water temperature switch connector from the water inlet
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  3. Disconnect the lower radiator hose from the water inlet housing.
  4. Remove the timing belt and timing belt pulleys as described in this section.

  5. Remove the two nuts attaching the water by-pass pipe to the water pump
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  8. Remove the two O-rings and gasket. Discard them and replace with new.
  9. Installation is the reverse of removal. Secure the water pump onto the
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  10. Fill the cooling system to the proper level with coolant.
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5S-FE Engine

  1. Drain the engine coolant.
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    Fig. 3: Bolt removal sequence for 5S-FE engines
    89553g46.gif

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  1. Drain the engine coolant.
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  3. Disconnect the timing belt from the water pump pulley.
  4. Remove the bolt holding the inlet pipe to the alternator belt adjusting bar
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  7. Scrape any remaining gasket material off the pump mating surface. Apply a
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    Fig. 4: Apply sealant on the surface of the water pump as shown

    89553g47.gif



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    Fig. 5: Unbolt the No. 3 timing belt cover from the engine
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    Fig. 7: Pull the water pump from the engine and remove it from
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