Question about 1990 Mazda MX-5

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Water pump recently i took car to garage for repair. after fitting a new alternator the fan belt began screeching. when i returned to garage they were too busy to fix problem .as i drove home the radiator overheated and burst. is this because the fan belt runs the water pump and are the garage liable for the repairs

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Sounds like fan belt wasnt done up tightly and suprised garage wouldnt find time to fix or inspect thier own repair.Unsure about liability.From the point of view that thier repair caused a problem that didnt previously exist i would have to say yesbut you need to prove the car wasnt over heating before it went there.That screech may have been slipping,certainly sounds like it.On the other hand,you chose to drive to the point of a serious overheat and failed to see the temp rising on your dash gauge.Dont get me wrong im not saying its your fault but if you pursue the liability thing it will be asked why you drove the car knowing there was a problem.

Posted on Oct 22, 2008

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I just had my timing belt and water pump changed now the belt sounds like it's squealing grinding every time I start up engine but when I start driving it stops should I worry about this?

The timing belt is inside the engine, so has no relevance. The water pump being changed has no relevance.

The serpentine belt which drives the alternator and AC is slipping and that causes the screeching. As soon as the belt warms up a bit because of the friction, it starts to grip and the screeching stops. You can do one of two things, get the garage to tighten the belt, or buy some 'serpentine belt re-conditioner' which cleans the belt and is a bit sticky, so it helps it to grip. You can get it from automotive spares shops. You just spray it onto the inner service of the belt at one of the V-Pulleys with the engine running.

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The screeching is the belt slipping, two possibilities, either the belt is not tight enough, or you have fitted a faulty pump which is putting to much resistance on the belt? If it carries on screeching for any length of time it will break. Check your alternator belt tension, if you had to remove and refit that? Quick check for alternator belt is, switch on headlights, does the screech get louder? Don't over tighten the belts, this puts stress on bearings!

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1 Answer

Water pump going out how do i replace it

  • Removal of the Fan Shroud and Drive Belts
    • 1 Drain the cooling system. Place a waste oil collection pan underneath the petcock valve on the lower corner of the radiator. Open the petcock valve to drain the system.
    • 2 Remove the bolts that connect the fan shroud to the radiator core and remove the fan shroud.
    • 3 Loosen the alternator adjustment bolt and slide the alternator toward the engine. Remove the drive belt.
    • 4 Loosen the adjustment bolt for the air conditioning compressor, and slide the compressor toward the engine. Remove the drive belt.
    • 5 Loosen the adjustment bolt on the power steering pump and slide the pump toward the engine. Remove the drive belt.
  • Removal of the Water Pump
    • 1 Disconnect the bypass hose from the water pump by loosening the hose clamp and pulling the hose off the fitting.
    • 2 Remove the bolts that connect the water pump to the engine block, and remove the water pump and engine fan as an assembly.
    • 3 Remove the four retaining nuts that connect the fan assembly to the water pump. They will be located between the fluid coupling and the water pump pulley.
  • Installation of the Water Pump
    • 1 Attach the fan assembly to the new water pump by sliding the pulley then the fluid coupling onto the water pump and reinstalling the retaining nuts.
    • 2 Clean any old gasket material off the water pump mounting surface on the engine block.
    • 3 Place the new water pump gasket on the water pump mounting surface.
    • 4 Slide the new water pump into position and reinstall the mounting bolts.
    • 5 Reconnect the bypass hose by sliding the hose over the fitting and tightening the hose clamp.
  • Reinstalling the Drive Belts and Fan Shroud
    • 1 Reinstall the the drive belts for the power steering pump, air conditioning compressor and alternator. Tighten the adjusting bolts.
    • 2 Measure the deflection of each belt to make sure the belts are properly tightened. Measure deflection by placing a straight edge along the belt against the accessory pulley and the water pump pulley. Push down on the belt and measure the distance between the belt at the midpoint and the straight edge. It should be between 1/2 and 1/4 inch. Any more and the belt needs to be tightened. Loosen the adjustment and slide the accessory away from the engine to tighten.
    • 3 Drop the fan shroud into position and reinstall the bolts that secure it to the radiator.
    • 4 Close the petcock valve on the radiator and fill the cooling system with fresh coolant.
    • 5 Run the engine and visually inspect for leaks.

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