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#4636960 - 01/16/18 04:48 PM Water Pump-Composite or Metal Impeller
willbur Offline


Registered: 06/06/13
Posts: 287
Loc: sw ohio
Greetings All

Which is preferable for a water pump-composite or metal impeller?

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#4636967 - 01/16/18 04:59 PM Re: Water Pump-Composite or Metal Impeller [Re: willbur]
Trav Offline


Registered: 11/20/06
Posts: 18885
Loc: MA, Mittelfranken.de
Metal without a doubt.
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#4637004 - 01/16/18 05:44 PM Re: Water Pump-Composite or Metal Impeller [Re: willbur]
Silk Online   content


Registered: 07/26/03
Posts: 4561
Loc: New Zealand
If the pump is prone to cavition you need plastic or cast iron.
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#4637005 - 01/16/18 05:44 PM Re: Water Pump-Composite or Metal Impeller [Re: willbur]
dlundblad Offline


Registered: 09/30/13
Posts: 10033
Loc: Indiana
Use the OE pump and whatever that may be.
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03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
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97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4637013 - 01/16/18 05:50 PM Re: Water Pump-Composite or Metal Impeller [Re: willbur]
Audios Offline


Registered: 11/19/11
Posts: 887
Loc: Lyndhurst NJ
Metal for sure, never had a good thing come long term from plastic/composite impellers. Will also give you headache overheating issues in the future if the impeller is slipping on and off the driving shaft.
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2002 VW Golf TDI-Mobil 1 5/40 TDT
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2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL

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#4637040 - 01/16/18 06:15 PM Re: Water Pump-Composite or Metal Impeller [Re: willbur]
jeepman3071 Offline


Registered: 04/15/10
Posts: 4216
Loc: Storrs, Connecticut
After fixing a few plastic water pumps on a friend's BMW e46, my vote is metal.
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#4637070 - 01/16/18 06:40 PM Re: Water Pump-Composite or Metal Impeller [Re: willbur]
Kibitoshin Offline


Registered: 04/19/16
Posts: 693
Loc: Kaiōshinkai
Metal is preferred but don't buy a bottom of the barrel aftermarket water pump because it has a metal impeller. Most OEM water pumps have plastic impellers and in a well maintained system should not have any issues.

Even metal impellers can fail too.
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#4637085 - 01/16/18 06:54 PM Re: Water Pump-Composite or Metal Impeller [Re: Kibitoshin]
nthach Offline


Registered: 01/02/04
Posts: 3898
Loc: California
Originally Posted By: Kibitoshin
Metal is preferred but don't buy a bottom of the barrel aftermarket water pump because it has a metal impeller. Most OEM water pumps have plastic impellers and in a well maintained system should not have any issues.

Even metal impellers can fail too.

Yep - it's how well maintained the cooling system is that will dictate how long a water pump will last. Coolant pH and chemistry(sticking to the same formulation for service or topping off) matter a lot. If you own a diesel, this is even more vital.

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#4637113 - 01/16/18 07:20 PM Re: Water Pump-Composite or Metal Impeller [Re: willbur]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
If you have something that doesn't use HOAT type coolant, a composite one might not hold up. I would get something OE quality.
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#4637216 - 01/16/18 09:10 PM Re: Water Pump-Composite or Metal Impeller [Re: willbur]
PeterPolyol Offline


Registered: 03/06/16
Posts: 1345
Loc: toronto
Anyone who willfully chooses a composite impeller pump to a metal one absolutely deserves it. Unfortunately, most people never make this choice and still suffer the consequences.

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#4637225 - 01/16/18 09:18 PM Re: Water Pump-Composite or Metal Impeller [Re: willbur]
Kage860 Offline


Registered: 04/17/17
Posts: 88
Loc: NY
For the chrysler 3.7 iíve heard people say to stick with the mopar plastic impeller.
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#4637232 - 01/16/18 09:24 PM Re: Water Pump-Composite or Metal Impeller [Re: willbur]
Rand Offline


Registered: 08/20/03
Posts: 12643
Loc: NE,Ohio
What engine/vehicle?

or just looking for general info?


Edited by Rand (01/16/18 09:24 PM)
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#4637241 - 01/16/18 09:32 PM Re: Water Pump-Composite or Metal Impeller [Re: willbur]
andyd Offline


Registered: 09/25/04
Posts: 7150
Loc: Marshfield , MA
The impellers and shafts are splined press fits. I wouldn't want plastic, if I had a choice. When you sell a pump with a plastic impeller, you're saying to the customer. Its OK , the bearing or the packing will fail first. grin2
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Thick oil is better grin2

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#4637281 - 01/16/18 10:43 PM Re: Water Pump-Composite or Metal Impeller [Re: Kage860]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
Originally Posted By: Kage860
For the chrysler 3.7 iíve heard people say to stick with the mopar plastic impeller.


That's what OE is and what I still use. I think whoever said it's coolant that matters is spot on.
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15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)

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#4637310 - 01/17/18 01:11 AM Re: Water Pump-Composite or Metal Impeller [Re: HoosierJeeper]
Cdn17Sport6MT Offline


Registered: 09/30/17
Posts: 18
Loc: Vancouver, BC Canada
Maybe call it intuition, but my sense is that a composite impeller will undergo only so many heat-up / cool-down cycles before fractures develop. The Duratec V6 Ford / Mercury from the Contour / Mystique of a number of years ago suffered waterpump failure / overheating (it being an aluminum heads / aluminum block engine) when the OEM plastic impeller started spinning freely on its shaft, or when the impeller grenaded. I did not let it come to that... rather, I pre-emptively replaced it with a metal impeller jobber water pump...
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