Question about 1991 Chevrolet Lumina

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Cant loosen old water pump pulley bolts because the pump will spin how do i stop it from spinning

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If out of the car, use an impact wrench attached to an air compressor (3.5 hp or greater should work).

Then, you can hold the pulley and the bolts should spin out.

Posted on Oct 13, 2010

  • Duane Wong
    Duane Wong Oct 13, 2010

    Or hold the pulley in a vise to keep it from spinning.

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Wrap the pulley with the belt and grip it close and hold

Posted on Oct 13, 2010

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Replace water pump torrent


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Water Pump appears to be "fused" to engine housing. Already removed the four bolts to remove pump, but it will not budge. What am I missing out on doing here?


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How do you replace the water pump?


PLEASE DON'T FORGET TO RATE!!!!

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After removing the cooling fan assembly, remove the water pump pulley-4.3L engine

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Location the water pump pulley bolts-2.2L engine

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If the pulley turns when you try to loosen the bolts, attach sockets and ratchets to two of the bolts, insert a pry bar to hold the pulley in place and loosen the bolts-2.2L engine

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Once all the bolts are unfastened, remove the water pump pulley-2.2L engine

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Disconnect all hoses attached to the water pump assembly-4.3L engine

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Unfasten and remove the water pump retaining bolts-4.3L engine

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The water pump is retained by four bolts-2.2L engine

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Remove the water pump from the vehicle-4.3L engine

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Removing the water pump from the engine block-2.2L engine

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Use a scraper to clean the old gasket material from the water pump ...

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... and the water pump-to-engine mating surface

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How do i change a water pump in a 1995 Pontiac Grand Prix


Hope the following will help.
1) Drain the radiator.
2) Loosen the 4 bolts on the water pump pulley. You will remove the pulley and install it on the new pump. Just loosen the bolts 1/4" turn with the belt still on, this will prevent the pulley from turning.
3) Remove serpentine belt.
4) Remove 4 bolts and the pulley and set aside.
5) Remove two power steering pump bolts (15mm). You must do this because one of the bolts for the water pump is behind the PS pulley, and you can�t remove it without moving the PS pump out of the way. The bolts on the PS pump are in the 12 o�clock and 6 o�clock position. There is a large access hole in the PS pump pulley. Just line it up, slip in a long socket and remove them. Let the PS pump rest on the oil filter housing.
6) Remove water pump. There are 4 large bolts (15mm) and 4 small bolts (3/8") on the water pump. After the bolts are all out, I placed a length of pipe on the water pump and gave it a couple taps with a hammer and it popped right off.
7) Remove old gasket. The tool of choice IMO is a razor blade like you�d use to remove a winshield inspection sticker. Be careful not to score the mating surface. Remove old gasket and dry off surface.
8) Seat the new gasket and water pump in place, install all the bolts.
9) Reinstall the PS pump and torque bolts.
10) Install pulley on water pump and torque.
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12) Re-torque bolts on water pump pulley if needed.



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a flat bar or screwdriver can be put across 2 bolts for leverage or wrap belt around pulley and pull tight for tension on pulley while loosening bolts

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1 Answer

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Normally, the fan will not spin at the same RPM as the engine. This is the purpose of the fan clutch. On the fan clutch sits a little thermal spring that engages the clutch to spin the fan at the same rpm as the motor when the motor gets hotter than normal.

Being able to hold onto the fan while the motor is running, is normal (not recommended, but normal).
You can test the clutch by heating it and then trying to spin the fan while the motor is off. If it is still easy to spin, you could have a bad fan clutch, or you didn't heat it enough. It is kind of a crappy way to test.

You not having cooling issues leads me to guess that your clutch is alright. But I don't know what type of climate you live it, nor do I know in what condition your clutch is.

They can actually be difficult to replace. Easy theory, but actually doing the job may be harder than you think. They are threaded onto the water pump pulley (just one big threaded stud). To remove you need to either be really crafty, or you need a wrench designed to hold the pulley in place while you loosen the clutch and fan assembly. No, the pulley drive belt is not enough to keep the pulley from turning (it will either slip or you will turn the crank of the motor).

Usually they are on there pretty tight! When I replaced my water pump on my truck, I could not remove the fand and clutch from the water pump while in the truck (I had to remove my radiator shroud and remove it all in one piece) then I had to weld the old water pump impeller to the casting to keep it from spinning then broke it loose with a 2ft breaker bar! Seriously.

Once you get the old one off, remove the fan and bolt it to your new clutch unit. Then thread it on the water pump.

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The big nut spins counter clock wise. you have to put your pulley bolts back on and make sure they are tight. leave belt on so that you have more resistance to pull against when tring to loosen the nut put a bar inbetween the pulley bolts so it won't slip off and then loosen that big nut looking thing and you should have it from there. to the same thing in reverse order to install it

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