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Water Pump-Composite or Metal Impeller #4636960
01/16/18 04:48 PM
01/16/18 04:48 PM
Joined: Jun 2013
Posts: 321
sw ohio
willbur Offline OP
willbur  Offline OP
Joined: Jun 2013
Posts: 321
sw ohio
Greetings All

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

Re: Water Pump-Composite or Metal Impeller [Re: willbur] #4636967
01/16/18 04:59 PM
01/16/18 04:59 PM
Joined: Nov 2006
Posts: 20,566
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,566
MA, Mittelfranken.de
Metal without a doubt.


ASE L1, Master. Deutsch Meisterbrief.
Re: Water Pump-Composite or Metal Impeller [Re: willbur] #4637004
01/16/18 05:44 PM
01/16/18 05:44 PM
Joined: Jul 2003
Posts: 4,893
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,893
New Zealand
If the pump is prone to cavition you need plastic or cast iron.


1987 BMW R65 - Aegis SAE30
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Water Pump-Composite or Metal Impeller [Re: willbur] #4637005
01/16/18 05:44 PM
01/16/18 05:44 PM
Joined: Sep 2013
Posts: 10,679
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,679
Indiana
Use the OE pump and whatever that may be.


03 Jeep WJ 4.0 202k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

Re: Water Pump-Composite or Metal Impeller [Re: willbur] #4637013
01/16/18 05:50 PM
01/16/18 05:50 PM
Joined: Nov 2011
Posts: 1,238
Lyndhurst NJ
Audios Offline
Audios  Offline
Joined: Nov 2011
Posts: 1,238
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.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: Water Pump-Composite or Metal Impeller [Re: willbur] #4637040
01/16/18 06:15 PM
01/16/18 06:15 PM
Joined: Apr 2010
Posts: 4,553
Storrs, Connecticut
jeepman3071 Offline
jeepman3071  Offline
Joined: Apr 2010
Posts: 4,553
Storrs, Connecticut
After fixing a few plastic water pumps on a friend's BMW e46, my vote is metal.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (36k) - Castrol Edge Euro 0w40, MANN HU816X
Re: Water Pump-Composite or Metal Impeller [Re: willbur] #4637070
01/16/18 06:40 PM
01/16/18 06:40 PM
Joined: Apr 2016
Posts: 781
Specific Ocean
Kibitoshin Offline
Kibitoshin  Offline
Joined: Apr 2016
Posts: 781
Specific Ocean
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.


Shin Gekiretsu Shin'ou'hou
01 Toyota Tundra 2WD V8 4.7L
02 Chevy Silverado C1500 V8 5.3L
Re: Water Pump-Composite or Metal Impeller [Re: Kibitoshin] #4637085
01/16/18 06:54 PM
01/16/18 06:54 PM
Joined: Jan 2004
Posts: 4,445
California
nthach Offline
nthach  Offline
Joined: Jan 2004
Posts: 4,445
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.

Re: Water Pump-Composite or Metal Impeller [Re: willbur] #4637113
01/16/18 07:20 PM
01/16/18 07:20 PM
Joined: Nov 2016
Posts: 1,283
WI
HoosierJeeper Offline
HoosierJeeper  Offline
Joined: Nov 2016
Posts: 1,283
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.


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)
Re: Water Pump-Composite or Metal Impeller [Re: willbur] #4637216
01/16/18 09:10 PM
01/16/18 09:10 PM
Joined: Mar 2016
Posts: 1,556
Toronto
PeterPolyol Offline
PeterPolyol  Offline
Joined: Mar 2016
Posts: 1,556
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.


Scambling for solutions is a hopelessly futile endeavour and potentially dangerous, without first coming to a solid, personal understanding of the problem. Beware riding the ideological hobby horse.
Re: Water Pump-Composite or Metal Impeller [Re: willbur] #4637225
01/16/18 09:18 PM
01/16/18 09:18 PM
Joined: Apr 2017
Posts: 110
NY
Kage860 Offline
Kage860  Offline
Joined: Apr 2017
Posts: 110
NY
For the chrysler 3.7 iíve heard people say to stick with the mopar plastic impeller.


2007 Jeep Liberty
Re: Water Pump-Composite or Metal Impeller [Re: willbur] #4637232
01/16/18 09:24 PM
01/16/18 09:24 PM
Joined: Aug 2003
Posts: 13,137
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,137
NE,Ohio
What engine/vehicle?

or just looking for general info?

Last edited by Rand; 01/16/18 09:24 PM.

2019 Jeep Cherokee Trailhawk 2.0T
Re: Water Pump-Composite or Metal Impeller [Re: willbur] #4637241
01/16/18 09:32 PM
01/16/18 09:32 PM
Joined: Sep 2004
Posts: 7,805
Marshfield , MA
andyd Online content
andyd  Online Content
Joined: Sep 2004
Posts: 7,805
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


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Water Pump-Composite or Metal Impeller [Re: Kage860] #4637281
01/16/18 10:43 PM
01/16/18 10:43 PM
Joined: Nov 2016
Posts: 1,283
WI
HoosierJeeper Offline
HoosierJeeper  Offline
Joined: Nov 2016
Posts: 1,283
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.


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)
Re: Water Pump-Composite or Metal Impeller [Re: HoosierJeeper] #4637310
01/17/18 01:11 AM
01/17/18 01:11 AM
Joined: Sep 2017
Posts: 106
Vancouver, BC Canada
Cdn17Sport6MT Offline
Cdn17Sport6MT  Offline
Joined: Sep 2017
Posts: 106
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...


Mazda6 GX (Sport in the 'States), 6MT, 2017
Moto Guzzi T5 850 NT, 1985
Honda Civic Si (EX 2 dr. in the 'States), A/T, 1997
Toyota Camry CE, 5MT, 1999
VW (Type2) Kombi, 4MT, 1979
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