smeegarn

New Member

• Mar 26, 2022

• #1

changed haldex unit after fault only to have bearing noise once changed thinking could be haldex unit as it was off a wreck but no trouble messages just bearing whining

 

Nodge68

Well-Known Member

• Mar 26, 2022

• #2

The diff tail bearing is known to fail.
Did you just swap the Haldex, or the whole rear diff assembly?

 

smeegarn

New Member

• Mar 26, 2022

• #3

only changed haldex unit diff seems to be ok

 

Nodge68

Well-Known Member

• Mar 26, 2022

• #4

smeegarn said:

only changed haldex unit diff seems to be ok

Click to expand...

It's unusual for the Haldex to suffer bearing failure, but if the Haldex was out of a badly damaged vehicle, then it's possible.
Did you spin the Haldex input shaft before installing it?

 

smeegarn

New Member

• Mar 26, 2022

• #5

luckily have olld haldex unit which only needs pump replace which is a later gen 3 unit so i'll try that and see how we go

 

Nodge68

Well-Known Member

• Mar 27, 2022

• #6

smeegarn said:

luckily have olld haldex unit which only needs pump replace which is a later gen 3 unit so i'll try that and see how we go

Click to expand...

Gen 3 Haldex was used up to the end of 8H chassis number range. The Gen 4 was introduced from 9H chassis number range.
You can't use parts between gen 3 and gen 4, or swap Gen 4 for Gen3, or Gen 3 for Gen 4.
They're totally different units , using different software specification, so the terrain response module doesn't communicate with the wrong Haldex.