Check the coolant pipe and hoses for cracks, damage, or restrictions.
Replace if necessary.
Fit the O-ring in the groove provided at the coolant inlet pipe end, wet the O-ring with coolant and insert the coolant inlet pipe.
Do not apply oil or grease to the coolant pipe O-ring.
Keep the coolant pipe connections free of sand, dust, etc.
Insert the coolant pipe fully into the coolant pump.
Do not reuse o-ring and replace it with a new part.