Water pump GRAF or OEM Volkswagen

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GRAF Water pump
Qmulus
Rating 3.0
  • Leaks:

As for the aluminum one made by/marketed as Graf, there are a few issues in my experience. First, the rubber gasket from the housing to the block is known to fail by tearing where the link in the gasket between the two passage connect. I think this is because the gasket does not precise fit in the channel for the seal machined into the housing. On the one that just put on an engine I just put in my '12 Tiguan, I cut that link out, effectively making two seals and relieving the tension in the seal. Next, the O ring seal supplied for the temp sensor is known to disintegrate, so I got a factory seal. Last, if your engine has a late water pump currently with the clip that holds in the temp sensor, the two mounting bolts to the block at the sensor will be too short for the aluminum pump housing, so you need to get the bolts for an early water pump. Honestly, as long as you don't have any oil leaks, the latest factory water pump is fine. I generally don't trust aftermarket water pumps, as I have had too many fail over the years (not on these engines, just in general). I used this Graf aluminum water pump as a test. The quality seems good, but time will tell.

Pros: quality seems good
Cons: gasket known to fail
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OEM Volkswagen Water pump
VincePassatB6
Rating 2.0
  • Overheating:

I am now at about 55k and the water pump failed on it causing it to overheat. I learned that the 2015 gen 3 TDIs have a variable water pump that fails quite often causing overheating - just a matter of time.

Cons: water pump failed, overheating
Vehicle: Volkswagen Passat
Mileage: 55000 km
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