Water pump GRAF or Hepu

Graf has been pretty good to me.

I have the Graf brand on mine, replaced mine at around 120k miles. It’s aluminum and has aluminum impeller also.

Hepu pumps are the best.

I installed one on me 325i 12k miles ago, no issues so far, it was part of the FCP euro water pump kits

6 months and 4000km on mine. Only found out a while after Graf has a bad rep. But no problems with mine yet.

Water pump if stock would have a plastic impeller known to fail, but you can find metal impeller options from Graf and Hepu brands and from other aftermarket brands too.

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.

Am pățit la fel dar cu o pompa Hepu, a mea a avut un sunet înainte să crape și la 120km/h a cedat axul, similar cum a fost a ta.

If the hepu water pump I put on my 3.0T is anything to go by, I don't know that I would recommend them for chains.

I put a Hepu water pump in about 20k miles ago.