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GMT-800 Water Pump Replacement (4.8L, 5.3L, and 6.0L Engines)


This is a discussion on GMT-800 Water Pump Replacement (4.8L, 5.3L, and 6.0L Engines) within the Tech How To forums, part of the TMC TECHNICAL category!
General Motors Trucks GMT-800 Water Pump Replacement (4.8L, 5.3L, and 6.0L Engines) Removal Procedure Drain the cooling system. Loosen the ...

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Old 10-15-2009, 11:34 PM
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GMT-800 Water Pump Replacement (4.8L, 5.3L, and 6.0L Engines)

General Motors Trucks GMT-800
Water Pump Replacement (4.8L, 5.3L, and 6.0L Engines)
Removal Procedure



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  1. Drain the cooling system. Loosen the air cleaner outlet duct clamps at the following locations:
Throttle body
Mass airflow/intake air temperature (MAF/IAT) sensor
*Remove the radiator inlet hose clip from the outlet duct.
*Remove the air cleaner outlet duct.

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*If necessary, remove the engine sight shield.
*Remove the radiator vent inlet hose from the radiator hose clips.

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* Reposition the inlet hose clamp at the water pump.
* Remove the inlet hose from the water pump.
* Remove the fan blade.
* Remove the accessory drive belt.
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* Reposition the outlet hose clamp at the water pump.
* Remove the outlet hose from the water pump.
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* Reposition the surge tank outlet hose clamp at the water pump.
* Remove the surge tank outlet hose from the water pump.
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* Reposition the heater inlet hose clamp at the water pump.
* Remove the heater inlet hose from the water pump.
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* Remove the water pump bolts.
* Remove the water pump and gaskets.

  1. Discard the water pump gaskets.
Installation Procedure

Important: All gaskets surfaces are to be free of oil or other foreign material during assembly.


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  1. * Install the water pump and NEW gaskets. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
    * Install the water pump bolts.
    Tighten
    1. Tighten the water pump bolts a first pass to 15 Nm (11 lb ft).
    2. Tighten the water pump bolts a final pass to 30 Nm (22 lb ft).



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* Install the heater inlet hose to the water pump.
* Position the heater inlet hose clamp at the water pump.


* Install the surge tank outlet hose to the water pump.
* Position the surge tank outlet hose clamp at the water pump.


* Install the outlet hose to the water pump.
* Position the outlet hose clamp at the water pump.
* Install the accessory drive belt.
* Install the fan blade.


* Install the inlet hose to the water pump.
* Position the inlet hose clamp at the water pump.


* Install the engine vent inlet hose to the radiator hose clips. * If necessary, install the engine sight shield.


Important: Align the arrow at the throttle body end of the duct with the throttle body attaching stud.

* Install the air cleaner outlet duct. * Install the radiator inlet hose clip to the outlet duct. * Tighten the air cleaner outlet duct clamps at the following locations:

Throttle body

MAF/IAT sensor
Tighten

Tighten the air cleaner outlet duct clamp screws to 7 Nm (62 lb in).

Fill the cooling system.

Attached Files
File Type: pdf Water pump replacement..pdf (250.4 KB, 5 views)
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Old 10-15-2009, 11:37 PM
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Good right up. those are probly THE easiest pumps to change, i especially like the gaskets, much better than paper, lots of room to pull it out and clean block, etc. EVERBODY should save a buck and change these themselves!!!
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Old 10-15-2009, 11:41 PM
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I've done them before but it's been a while, just a bunch of information I've been gathering up, hopefully it will be helpful to someone.
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Old 10-16-2009, 07:28 AM
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Old 10-16-2009, 07:30 AM
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Huh, I did my water pump change 10000 miles ago about (about 4 months ago), easy as pie.
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Old 10-16-2009, 07:48 AM
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Great write-up! Thanks
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Old 10-16-2009, 08:13 AM
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Quote:
Originally Posted by Stumpuller454 View Post
Good right up. those are probly THE easiest pumps to change, i especially like the gaskets, much better than paper, lots of room to pull it out and clean block, etc. EVERBODY should save a buck and change these themselves!!!
I'll agree with that.
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Getting the old gasket sealer off was the only hard part (other than getting the fan off of the pump).
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Old 10-16-2009, 10:36 AM
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just cause there is that much room doesn`t mean you have to "use" all of it.

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