Thread: any DIYs on replacing the alternator on an 08 E70 with 4.8i
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Old 03-25-2019, 12:30 AM
rbryantaz rbryantaz is offline
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Quote:
Originally Posted by Nanniepoo View Post
Re reading that and that might be for the alternator pulley.

There's conflicting info everywhere. Even TIS conflicts itself for the tensioner.

42 Nm here: https://www.newtis.info/tisv2/a/en/e...lement/5w2memI

And 22 Nm here: https://www.newtis.info/tisv2/a/en/e...ent/1VnYumS8Y8

That first link says 90Nm for idler.
Torques should be based on the bolt grade and size and if it is dry or lubricated...


I sell replacement INA pulleys Tensioner pulleys for the 4.8i and recomend the following:
The new Alt/WP/PS pulley is torqued to 40ft*lbs (55N*m) dry for the M10 bolt (which is actually conservative). 42Nm should be tight enough but 22 seems too loose... If it was supposed to be 22 then they would have used an M8 bolt like the AC tensioner.

https://www.boltdepot.com/fastener-i...ed-Torque.aspx

The alternator on the 4.8i actually isn't a bad job once you remove the belt and the fan. I did one in a couple of hours a few weeks back when diagnosing a sweak. Sadly it was the stupid HT pulley from ECS that was manufactured with the incorrect offset. I don't recommend that part!

As a result I now have a low mileage (5k miles) Valeo 180amp alternator that I need to sell now if anyone needs one...

-Rich
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