Water pump on my 340. Replacing it because there was some light but audible play in the shaft. Murray unit is about 5 years old. Much to the advice on here i replaced it with a high flow milodon water pump. Got it buttoned up. Going to flush the radiator out with distilled water tomorrow then its time to replace the t stat with a milodon t stat to match the highflow pump and fill her back up with fresh coolant