OEM 2008 GMC Sierra 1500 Water Pump

2008 GMC Sierra 1500 Water Pump Parts and Q&A

• Q: How to replace the water pump (LU3) on a 4.3L engine on 2008 GMC Sierra 1500?

  A: The first step to replace a Water Pump (LU3) in a 4.3l engine is to eliminate the air cleaner outlet duct and Drive Belt. Empty the cooling system through either the vac-n-fill process or the static fill technique. Change the radiator outlet hose clamps at the surge tank and Water Pump before taking the hose off its connections on both components. Shift in position the hose clamps on the Water Pump inlet and take off the inlet hose. Install the j 41240 fan clutch remover and installer tool to grip the Water Pump Pulley. After removing all the pulley bolts replace these with the Water Pump bolts. Finally take out the Water Pump assembly by using the tool. Take out the worn gaskets from the Water Pump and examine the pump for damages before installing new components. When using saved bolts apply gm 12346004 (Canadian 10953480) sealant or its equivalent on Water Pump bolt threads. Place fresh Water Pump gaskets and the pump into position before fixing the bolts to 45 n.m (33 lb ft). Use the j 41240 (J 41240) to hold the Water Pump Pulley while tightening its bolts to 25 n.m (18 lb ft). Set the Water Pump hose clamps with their forward-pointing tangs level with the Water Pump inlet hose diameter. Position the inlet hose clamps before putting in the Water Pump inlet hose. Place the radiator outlet hose back onto both the Water Pump and surge tank before repositioning its clamps. Attach the Drive Belt and the air cleaner outlet duct to the vehicle. Complete the cooling system setup by choosing between vac-n-fill method or static fill method before testing for any fluid loss.