Waterpump problems - leaking - Replace with better part

This information is ONLY for the petrol version (1KRFE engine), NOT the Diesel ( with waterpump SU001-00596).

The older models pre facelift has a bad waterpump construction. I think this was fixed when the new facelift version was released, around 2009.

Disclaimer: The information has been gathered trough Internet. I take no responsibility of the correctness of this post, do your own diligence.

The earlier versions of the triplets (Aygo, C1, 107) have had a bad engineering construction of the water pump. Many problems of leaking has been reported, this may cause failure of engine if not sorted out in time. This post is trying to sort out what kind of version of the water pump there is.

I think there are three versions available:

Mk1

version 24-1020 with metal sheet housing suitable for OE:

Toyota/Daihatsu 16100-09240, 16100-80003, 16100-09450, 16100-80001, 16100-97234/

Citroen-Peugeot 1201.H0

The metal sheet version has been supplied till 2009, the seal eventually will start to leak, checking the presence and condition of the seal will have to be done if the waterpump not has been changed yet and you are still on the first version of water pump.

Mk2

Some people claim there has been a Mk2 version, I don’t know anything about it. 16100-80007, this might be the same as the Mk3 version.. One person claims that this part I pressed and not as good as the Mk3. I would guess it might be casted or made in a CNC-machine.

Mk3

(this is the latest version, and has bolts of different lengths) manufactured from die casting, making it stronger and prevents leaking (thicker aluminum flange).. The torch setting for the bolts is 28 Nm.

version 24-1020 with aluminum housing suitable for OE:

Toyota/Daihatsu 16100-09530, 16100-80007/ Citroen-Peugeot 1201.L3

The water pump must be fixed on the engine block exclusively by means of the rights bolts because of the different thickness of the aluminum housing. Bolts length: 50mm, 45mm, and 20mm.

So if you are going to replace your waterpump, then the latest pump part number for later models (2005> is:

Toyota Water Pump 16100-09530

BoltsBolts 91551-00820 Qty 2
Bolt 91551-00845 Qty 1
Bolt 91551-00850 Qty 2

Pictures of the better construction (Mk3 version):

This waterpump fits:

Citroen C1 1.0 (ref. no. 1201.L3, 1201.J0)

Daihatsu Cuore VIII 1.0 / Sirion 1.0 (ref. no. 16100-80001)

Peugeot 107 1.0 (ref. no. 1201.L3, 1201.J0)

Subaru Justy 1.0 (ref. no 16100-80003)

Toyota Aygo 1.0 / Yaris 1.0 (ref. no. 16100-09530)

I would say: Go for the Toyota number, perhaps their parts comes from Quinton Hazel? Anyways there are waterpumps available from Quinton Hazel also. Fox example: QCP3667 (similar to the Mk3 version) ((BxHxT mm): 185x125x125 : 1050g )

Avoid: QCP3631 (looks like the first version, Mk1) (BxHxT mm): 185x125x125 weight: 900g )

987691 (BxHxT mm): 140x115x115, weight : 1060g ) (perhaps this is the Mk2 version??)

Read more here:

http://www.x1-autoteile.de/index.php?site=search&articlesearch=T226

Changing / Replace the Waterpump instruction:

Turn the steering wheels full right and lock the steering by removing the keys.

Slacken the drive belt & remove it:

A 14mm socket is needed for the uppermost main alternator pivot bolt, then use 12mm for the alternator adjusting clamp bolts so that the drive belt can be removed first. The waterpump is fixed with five 12 mm bolts.

If you wish you could perhaps try to save the coolant and reuse it. Your choice! Removing all the bolts holding the pump in place and try to catch what coolant you can with a bucket or something..

Make a note of which bolt went where, and check there length (if you can´t remember, write it down!
Make sure the engine block has all traces of gasket / sealant removed.

Bolt up the new water pump, remember the seal!, use torch 28 Nm (according to site I found, don’t trust me!)

Re-fit the drive belt and set to the correct tension.
Re-fill with coolant, turn heater to hot and bleed system.

Here are some pictures / photograph by "Uncle Bob" when he replaced his waterpump, hope your are ok with me lending the pictures Bob? You never know when does forum vanishes..Taken from the excellent forum:
http://www.toyotaownersclub.com/forums/index.php?showtopic=118041



See the pink spot, showing some minor leaks.




Here the pump is removed, showing the seal



Old Mk1 waterpump versus the new black Mk3

From the side view
Credit for photos goes to "Uncle Bob" from the Toyota Aygo Forum, thanks för documenting!

Pictures: Some screenshots also from

http://www.swag.de/uploads/media/SWAGprof_90994_Wasserpumpe_4c_GB_2011.pdf

http://www.kwp.it/public/info_tecniche/Water-Pumps-Pompe-Acqua_1020.pdf