Owner reviews for water pump

Aisin TKF-005 has the 2 port pump and is otherwise identical to TKF-004 with the 3 port pump.

Ive reinstalled another new HEPU(made in germany) pump due to mileage. I don't think anything is wrong with the old one. When I cleaned the o-ring seal contact area on the block it was corroded right where it left an imprint.

153k miles on my original WP. Still going strong too.

Has 137,000 miles on it original water pump. Still good to be used but don’t know when she’ll crap out. Very impressed that I lasted this long.

I went with Gates. My oem pump on my Mazda CX9 failed at 90k.... The bearing failed and the amount of bearing material in the housing was crazy.

However the pierburg shouldn't crack as it's all aluminum. That doesn't mean it'll last any longer. My original one (n54) failed at about 60k. Replaced with factory. Then replaced that one with pierburg as I was doing oil pan gasket and figured might as well since I'm in there at about 90k. The pierburg one failed at 10k miles (electronics jammed up somehow…I’m guessing some sort of freak surge or something as it’s a pretty simple design). Anyway replaced that with pierburg again and going strong albeit it’s only been 30k miles on the new one.

The 3.5 5th generation Explorer has an internal water pump driven by the timing chain. It’s an enormous pain to change requiring significant disassembly (nearly 12 hours of labor) and generally includes replacing the timing chain in the process since you’re already in there, plus when it fails it can easily mix the coolant with the oil and destroy the engine, all that’s keeping them apart is a little seal.

I did this on my Mazda CX9 (same design), also failed around 90k miles.

Update. The replacement HEPU water pump is now leaking.. from the freeze plug…

Replacement HEPU water pump is now leaking… from the freeze plug.. gonna let it ride and try a different brand when I change the belt in 50K miles