Thermostat Bypass Pipes Replacement 6.6L (LB7) Engine
Removal Procedure
- Remove the thermostat
housing crossover with the thermostat bypass pipe attached. Refer to
Thermostat Housing Crossover Replacement
.
- Remove the thermostat bypass pipe and O-ring seal from the water
crossover.
- Remove and discard the O-ring seal.
- Clean the sealing surfaces of the bypass pipe.
- Clean the water pump and the thermostat housing crossover sealing
surfaces.
Installation Procedure
- Install a new O-ring seal
on the thermostat bypass pipe.
- Lightly lubricate the O-ring seal with coolant.
- Install a new O-ring seal for the bypass pipe to the water pump.
- Install the bypass pipe in the thermostat housing crossover.
- Install the thermostat housing crossover with the thermostat bypass
pipe attached. Refer to
Thermostat Housing Crossover Replacement
.
Thermostat Bypass Pipes Replacement 6.6L LLY
Removal Procedure
- Remove the drive belt. Refer to
Drive Belt Replacement
for the 6.6L
(LLY) engine.
- Remove the bypass pipe from the thermostat housing
- Remove and discard the O-ring seals from the bypass pipe and the water pump.
- Clean the sealing surfaces of the bypass pipe.
- If required, clean and inspect the bypass pipe and thermostat housing. Refer to
Engine Coolant Thermostat Housing Cleaning and Inspection
for the 6.6L (LLY) engine.
Installation Procedure
- Install a NEW O-ring seal onto the bypass pipe.
- Install a NEW O-ring seal to the water pump.
- Lubricate the O-ring seals with clean engine coolant.
- Install the bypass pipe into the thermostat housing.
- Install the drive belt. Refer to
Drive Belt Replacement
for the 6.6L (LLY) engine.