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DIY: Mazda 2.5L Skyactiv Water Pump #5194360 08/23/19 06:03 AM
Joined: Aug 2004
Posts: 21,089
The Critic Offline OP
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Posts: 21,089
Mazda Skyactiv engines seem to be popular on this site so hopefully this is a helpful DIY.

Replacing the engine water pump on the 2.5’s is very very easy. I think the 2.0 is similar. This job was performed on a 2014 with 125K. The water pump had some coolant staining on the body and there was some splattered coolant (residue) in the adjacent area. This condition had been present for the last 15K. According to the Mazda TSB, this was still passable since there was no active leak but the customer still wanted the pump replaced.

The pump pulley is held on by three 8mm bolts. There is a big hole on the pulley (and a corresponding recess on the pump) where you can insert a bolt and the pulley will lock onto the body. The pump itself is bolted to the engine using 3 10mm bolts. Undo the wire harness clip and the 10mm clamp bolt for the inlet pipe. Pump comes out. The new pump from Mazda, came with the pump gasket pre-installed but the water inlet pipe o-ring is sold separately. You must replace the o-ring.

You will also need a new stretch belt, a new alternator belt and almost two gallons of the Mazda FL22 55/45 pre-mix. Vacuum fill the system, allow the engine to idle for 30-45 min (until the rad fan comes on) with a coolant funnel or with the rad cap off, extract and refill the coolant reservoir and you should be good to go!

Parts needed:
#PEDD-15-010 $119.28
#PE01-15-287 $2.32
#PY01-15-908 (CX-5 2.5L) $20.17
#PY01-15-909A (CX-5 2.5L) $37.48
#0000-77-508E-20 (qty: 2) $25.32/gal

1CDC9589-9AB6-4883-B279-5A472C988C25.jpeg3A9D29C6-C303-4B51-8614-8550282261D0.jpeg57C38DCC-4C7B-47FD-AACD-19490C566017.jpeg5ADC0882-33B2-4F19-B10E-C2842080651A.jpegBE470AE3-0957-4E5E-A919-2B5BBBBA38CF.jpeg
Last edited by The Critic; 08/23/19 06:25 AM.

2011 Toyota Prius 1.8L - 195K - Pennzoil Platinum 0W-20
2007 Honda Accord 2.4 - 138K - Mobil 1 EP HM 5W-30
Re: DIY: Mazda 2.5L Skyactiv Water Pump [Re: The Critic] #5194400 08/23/19 07:16 AM
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BMWTurboDzl Offline
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Thanks for sharing! I always enjoy reading this stuff.


“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: DIY: Mazda 2.5L Skyactiv Water Pump [Re: The Critic] #5194467 08/23/19 08:54 AM
Joined: Nov 2002
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buster Offline
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Thanks Critic, good write up.


2019 Frontier Pro 4X - Castrol EDGE EP 5w30
2019 Impreza Sport - OE fill
Re: DIY: Mazda 2.5L Skyactiv Water Pump [Re: The Critic] #5194585 08/23/19 11:38 AM
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Posts: 19
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cudavid Offline
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Thanks for a good write up Can you offer a followup please?
The stretch belt is new to me , how did you remove and install? Thank you

Re: DIY: Mazda 2.5L Skyactiv Water Pump [Re: cudavid] #5194589 08/23/19 11:43 AM
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Posts: 21,089
The Critic Offline OP
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Originally Posted by cudavid
Thanks for a good write up Can you offer a followup please?
The stretch belt is new to me , how did you remove and install? Thank you

For removal, you can either cut the belt or pull the belt towards you and rotate the crank pulley simultaneously.

For install, zip-tie the belt to the p/s pulley and slowly turn the crank while ensuring that the belt is walking onto the pulley grooves.


2011 Toyota Prius 1.8L - 195K - Pennzoil Platinum 0W-20
2007 Honda Accord 2.4 - 138K - Mobil 1 EP HM 5W-30
Re: DIY: Mazda 2.5L Skyactiv Water Pump [Re: The Critic] #5194603 08/23/19 12:02 PM
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50jeffrey Offline
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If the vehicle is a 2015 or newer, there is no p/s pulley, as the vehicle has electric-assist steering (no pump). Can just zip-tip the belt to the w/p pulley itself.

Re: DIY: Mazda 2.5L Skyactiv Water Pump [Re: The Critic] #5194999 08/23/19 08:49 PM
Joined: Jul 2013
Posts: 1,310
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splinter Offline
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Nice!

I autocross my Miata which is indeed a joy on which to twist wrenches.

Upside to competing -besides the fun- is Mazda NA HQ in Irvine supplies all factory replacement hardware at actual dealer cost.
They're a great company with solid hardware imho.


PUP 0W-40
Total Quartz 5W-40
M1 5W-50


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