bottomwatcher Posted January 26, 2020 Report Share Posted January 26, 2020 Bought a duralast waterpump for my highlander and the impeller is plastic. Never seen a plastic impeller before.All I have is old shit. This may be normal nowadays. Should I look for one with a metal impeller? Thanks. Quote Link to comment
Draker Posted January 27, 2020 Report Share Posted January 27, 2020 1 hour ago, bottomwatcher said: Bought a duralast waterpump for my highlander and the impeller is plastic. Never seen a plastic impeller before.All I have is old shit. This may be normal nowadays. Should I look for one with a metal impeller? Thanks. If I had a choice between the two I’d go metal. Ask Bmw owners about plastic impellers. Then ask them how much their replacement engine cost. my recommendation, check rock auto for a metal one if they exist. If they don’t then mark your calendar when you plan on replacing it again... or buy oem. Quote Link to comment
Mattndew76 Posted January 27, 2020 Report Share Posted January 27, 2020 Lighter is better and the plastic is only pushing water. Quote Link to comment
john510 Posted January 27, 2020 Report Share Posted January 27, 2020 Is the original impeller plastic ? and try to stay away from Duralast. Quote Link to comment
bottomwatcher Posted January 27, 2020 Author Report Share Posted January 27, 2020 Thanks for the input. My first impression was to stay away but that was all they had and I hate making the long trip to civilization. I will be returning it and try to find an aisin. No instant gratification at the discount shops. Quote Link to comment
I'm BLUE Posted January 27, 2020 Report Share Posted January 27, 2020 (edited) My choice....Timing belts , and water pumps on newer rigs = Genuine OEM (close second choice is AISIN stuff for japanese ) Realistically Genuine partsot much more money for the last 5 ? Rigs I've done belts/pumps on... Other than that metal is my choice.... I'm just simply resistant to some change and know metal works..... Duralast is not really my first choice.....may the force be with you... young Skywalker.... Edited January 27, 2020 by I'm BLUE Quote Link to comment
bottomwatcher Posted February 3, 2020 Author Report Share Posted February 3, 2020 Ok well I ordered an aisin pump and timing belt replacement kit. Brand new aisin pump had, wait for it. A frigging plastic impeller! Anyways I will trust aisin over everlast. Bearings in kit were Japanese and belt was Mitsubishi with a made in USA label. So hell with it the waterpump goes in. I guess it is normal now to have plastic impellers. Probably been that way for a while, newer vehicles suck for repair. I have changed my Datsuns waterpump in a rest stop before and maybe took a half hour. 1 full day so far and I hope I'm halfway done. Sorry for the rant but a simple waterpump change shouldn't take dismantling the entire front of the engine. Quote Link to comment
Draker Posted February 3, 2020 Report Share Posted February 3, 2020 I would trust the oe pump too. It’ll be fine for a long time, or at least as long as the last one. Quote Link to comment
pdp8 Posted February 22, 2020 Report Share Posted February 22, 2020 I appreciate the strength of metal, but weight and corrosion are things to be reckoned with. I have plenty of lab equipment that uses plastic for critical cooling system parts and find it to work well. In theory, you could make the longest-lasting, most fuel-efficient, and best cooling impeller out of plastic but somehow cars do seem difficult.. A friend spent a couple grand to deal with the interference damage when her Audi TT had it's plastic impeller fail, but of course the Datsun isn't using a timing belt in common with the water pump and perhaps whoever is making the Datsun ones used a better plastic than the Audi ones. Your original pump can have it's seal and bearing replaced. If it has a cast-iron impeller it really should outlast all of us. The sheet-metal impellers are prone to rot away if anti-rust is not used (and replenished periodically) in the system. Quote Link to comment
datzenmike Posted February 22, 2020 Report Share Posted February 22, 2020 Cheap L series pumps have stamped impellers and are junk. Sharp bends and thin stamped metal will cavitate easier than smooth solid cast ones. Plastic won't matter for strength because .... water. Quote Link to comment
MikeRL411 Posted February 22, 2020 Report Share Posted February 22, 2020 Keep your antifreeze level at or slightly above 50% and you should not have a blade corrosion problem. Given that, I vote for cast steel impellers ! You are at the mercy of the maker as to just how sharp a bend is put in when forming the blades in a sheet metal impeller, too small a bend radius and you invite stress corrosion. Quote Link to comment
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