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Old January 27th, 2008, 13:46   #1
TornadoRed
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Default Best water pump?

With most timing belt kits rated at 80k-100k miles, nobody wants to experience a premature water pump failure. With that in mind, which is the most reliable water pump brand?

Laso (metal impeller, brass?)


Laso (plastic impeller)


Geba (plastic impeller)


Graf (metal impeller)

Hepu (plastic impeller)

Hepu (metal impeller)

Meyle (plastic impeller)

I suppose the best question is, which ones tend to fail the most often? Avoid those and what you have left should be reasonably reliable for 100k miles.

Also, I have read that if a plastic impeller breaks, it will just stop working. But if a metal impeller fails, it could stop spinning and lock up, leading to rapid timing belt failure. Is this true in the real world, or just theoretically?
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Old January 27th, 2008, 17:38   #2
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Generally I try to stick with a metal impeller... just change it every 100,000 miles/ 5 years with the belt... you won't have a problem
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Old January 27th, 2008, 18:03   #3
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I only use LASO Brass. 600ish or so and they have never failed once.
I have had 3 HEPU pumps fail and one factory unit. These are all A4's.
Had good luck with A3/B4 no matter what one.
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Old January 28th, 2008, 04:34   #4
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I just changed out my Hepu plastic impeller almost 30k early thanks to a leak .
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Old January 28th, 2008, 04:38   #5
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I like Laso or Graf metal impellers. I would NEVER install a plastic impeller one unless I had no choice. Just seen to many broken.
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Old January 28th, 2008, 04:39   #6
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Quote:
Originally Posted by jasonTDI
I only use LASO Brass. 600ish or so
Are you sure they arent made of gold ?
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Old January 28th, 2008, 05:08   #7
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Quote:
Originally Posted by ninedee_golf_tdi
Are you sure they arent made of gold ?
lol, It took me a second read to realize that its the number of times he has used them .
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Old January 28th, 2008, 05:58   #8
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LOL. I've done a couple of them.....The guys that have come on some days and seen 3 of them done. It's just a method to madness. Once you've done a bunch they are second nature.
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Old January 28th, 2008, 07:11   #9
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Personally I prefer the resin (they are not plastic) impellers, reason is better flow of coolant.

However I have had/seen issues with the rebuilt pumps from VW.

The brass impeller is a very close 2nd to the resin impeller due to the very smooth casting process resulting in very good pumping quality!

The cast iron impeller is junk, I hate them because they have such a poor cast quality, you can even see rough bits from the casting that no doubt make cavitation in the pump rotor. As for leaking I can't say I have seen one leak but then again most people I see don't bring these kits to my door.

1830 timing belts and counting...zero failures

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Old January 28th, 2008, 08:51   #10
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I would have to give my vote to the brass impeller type. Reason being is that i replaced my stock pump when i had the timming belt done only to have the new pump (plastic impeller) fail in 10,000 mi. The new brass one has been on for about 40,000mi
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Old January 28th, 2008, 09:57   #11
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I see so many broken plastic impellers (on all kinds of cars, not just Volkswagens) that I would never put one on. Resin, plastic, play-dough, call it what you want, they break and cause problems.
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Old January 28th, 2008, 14:06   #12
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You can tell that to BMW and Mercedes in the early to mid 90's when they had a bazillion in-line sixes blow heads due to them coming apart.
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Old January 28th, 2008, 14:28   #13
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Quote:
Originally Posted by jasonTDI
You can tell that to BMW and Mercedes in the early to mid 90's when they had a bazillion in-line sixes blow heads due to them coming apart.
Jaguar and Ford as well. Lots and lots of Duratec V6s died because of broken impellers. Most never got new engines because the POS rental fodder that they were bolted in to were not worth the hassle. But lots of Taurus and Contours were towed away from my shop to the scrapper.
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Old February 5th, 2008, 23:36   #14
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I think the Dieselgeek kit has a Laso waterpump with brass impeller...

tdiparts.com kit has a Graf waterpump with metal impeller...

BleachedBora doesn't say what brand, only that it has a metal impeller.

Metalmanparts.com has Graf waterpump with metal impeller.

Regardless of which design is best, the customers have spoken and the TB kits vendors have listened -- no more plastic (resin) impellers.
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Old February 6th, 2008, 03:32   #15
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Quote:
Originally Posted by oilhammer
I like Laso or Graf metal impellers. I would NEVER install a plastic impeller one unless I had no choice. Just seen to many broken.
__. When Matt ("Car 54") did the timing belt on my '02 sedan (~80K miles), I had ordered the "OEM Parts" kit from World-Impex. We got the engine mount out and the engine jacked up and he asked me to hand him the water pump. Crack open the box and "OSOD, it's a plastic impeller". "Is that bad?" I ask. He says "I sure prefer the brass impeller types". But it's 2PM on a Saturday and my car is spread across his garage floor. We agree that the plastic ("resin", play-doh, whatever) ones come from the factory so it will probably be OK. Then he pulls the stock one - the high quality resin impeller is eroded to sh!t -- I guess because it was doing such a good job of preventing cavitation and moving coolant.

__. When I bought the kit to change the belt on my replacement '03 wagon (you know, the one that absolutely "we have teh service documentation" had the belt changed at 100K miles - just as it was coming off lease), I specified the brass Graf impeller water pump.

__. I'm guessing that the *most important* issue is that you change the water pump and not expect the old one to live another 100K miles, and that principle is more important than the type of pump impeller, but my future kits will have (European-made) brass impellers on the water pumps.
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