Coolant is circulated by the water pump located at the front of the crankcase and is belt driven. Coolant flows inside the block around the liners and through internal passages and rises to the cylinder heads. The coolant is then circulated through the water manifold which collects the water at the outlets from the cylinder head.
Repair or Replacement of Water Manifold
To determine if repair is possible or replacement of the water manifold is necessary perform the following procedure. See Figure
Flowchart for Repair or Replacement of Water Manifold
Removal of Water Manifold
To remove the water manifold, perform the following:
Do not remove the pressure control cap from the radiator or attempt to drain the coolant until the engine has cooled. Once the engine has cooled, use extreme caution when removing the cap. The sudden release of pressure from a heated cooling system can result in a loss of coolant and possible personal injury (scalding, eye injury, etc.) from the hot liquid.
Drain the cooling system.
Disconnect water manifold to water pump hose.
Remove upper radiator hose from water manifold.
Disconnect heater hose from water manifold.
Disconnect air bleed hose from water pump.
Remove twelve water manifold bolts from cylinder block.
Remove water manifold and discard gasket.
Remove four water manifold nuts and separate manifold. Discard gasket.