Turn the water pump over and install J 35687
, water pump impeller slip and lash tester, into the tapped holes provided in the impeller; see Figure
Measuring Water Pump Drive Gear Run-out
Clamp the water pump drive gear in a vise, with the impeller facing up. Use soft jaws to prevent damage to the gear teeth.
Using a 1/2 in. drive torque wrench in the hole provided in the center of the slip-lash tester, apply 68 Nm (50 lbft) torque in either direction. The impeller must withstand 68 Nm (50 lbft) torque without slipping.
If the torque 68 Nm (50 lbft) is satisfied without the impeller slipping, check combustion gases in coolant; refer to section
If the torque 68 Nm (50 lbft) is not satisfied and the impeller is slipping, refer to section
Water Pump Impeller Replacement
Perform the following steps to replace water pump impeller: