AUX WATER PUMP

[henrym3]

Decided to take the pump to bits.

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Someone tell me that the printed circuit shouldn’t have coolant around it. It’s just that I can’t see how the coolant got from the top chamber to the bottom and then started to leak out. I’ve cleaned it up and it runs fine. Not going to use it on the X but want to make myself a water/oil pump with a switch. I can put the bottom cover on and seal it but how the coolant got to the circuit board has me stumped

[Greydog]

Well, I never thought of stripping the pump. When mine stopped the first time I had the plastic return pipe on the Header Tank let go and swamped the front corner of the engine bay I thought it had killed the pump because the electrical connections were at the bottom (the plug was full of coolant) so I just cleaned everything changed the Pump and away it went. Recently had the Aux pump stop running again on the 4.6 and I haven't investigated yet as it only seems to delay warm up by a few minutes (I don't have LPG on the 4.6)

You say you want to put a switched water/oil pump. Water you may find a Bilge pump that will work, and some are designed to be submerged. For oil I considered electric after my engine rebuild to give full oil pressure before start to give the chain guides some Help/Protection I ended up buying a Pre-Oiling system from the USA that so far seems to work well (65k covered)

[X5Sport]

Someone tell me that the printed circuit shouldn’t have coolant around it.

You’re PCB shouldn’t have coolant all around it!

Seriously, no it definitely shouldn’t. Glycol has the ability to creep past seals, and there’s a hot/cold cycle that might just allow a very slow build up over many cycles (probably years in your case). The seal may look intact but it may be very slightly out of spec.

[henrym3]

The problem is there is no connection between the top chamber where the pump and coolant is and the bottom chamber where the motor is. It is a plastic housing,

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This thing should last forever if you keep the water away from the printed circuit. As I have already replaced the pump this is an interest only project. The more I look the more it bugs me.