As the old saying goes, "It may be filled for life but the life will be longer if it's changed"

Hi,

Question:
Is there any simple way of testing the Haldex pump (gen.4) when it is out of the unit? Is at as simple as just putting 12V on the terminals and see that it is running?

Have tested mine like this but apparently a more conclusive test is to measure the resistance using a multimeter. A good pump should be between 5-8 ohms.


https://www.haldexrepairs.co.uk/guide-gene...-shooting/ Landrover - turning owners into mechanics since 1948

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Hi,

Thanks for that! I have two pumps laying around. I measured them to 8 and 15 ohms first. Then I put 12V directly on them and both rotated. After that, I measured approx 5 ohms on both. They are hopefully fine, so I sent one of these to another FL2 owner in need. Hope it works

Since the pumps uses carbon brushes and were likely sitting around for a while, it's entirely reasonable that the resistance would be high initially due to a thin oxidation layer. Running the pump would rub that off, I'd be completely comfortable using those pumps.

What I might do is (after running it for a bit) check the resistance while it's warm, and then again after it cools down. As long as both are in spec, should be good.

Telco wrote:

The original one that I took off was a square profile and the replacement was round. I did check the thickness at the time and the replacement was slightly larger across the cross-section.
The replacement has been in a year with no issues and I think I'm right in saying that it's not under any real fluid pressure?