Serpentine, steering pump? Help!

Drivin4dollas · Post by **Drivin4dollas** » 24 Dec 2021, 11:17

Going back together today. Wish me luck.

Drivin4dollas · Post by **Drivin4dollas** » 24 Dec 2021, 13:41

Is this supposed to turn freely? Because it doesn't.

Drivin4dollas · Post by **Drivin4dollas** » 24 Dec 2021, 14:00

Once again... nevermind. I'm too used to having a big crankshaft pulley. Freaked me out for a minute that the "alternator pulley" wouldn't spin. Then I stared thinking like a diesel mechanic and figured out it was the gear drive for everything. Duh.

Post by **pgill** » 25 Dec 2021, 19:31

If the pulley in the picture is working it will spin easily in one direction and not at all in the other direction.

You are correct it is gear driven but it should freewheel like a bicycle

Good luck

Paul

Post by **RickHaleParker** » 25 Dec 2021, 23:59

Drivin4dollas wrote: ↑24 Dec 2021, 13:41 Is this supposed to turn freely? Because it doesn't.

The Alternator will freewheel when the drive pulley is spinning slower then the Alternator. That way the spinning mass of the Alternator does not stress out the other components. Less vibration, Longer belt life and saves some fuel.

Drivin4dollas · Post by **Drivin4dollas** » 26 Dec 2021, 08:12

So she's up and running, lots of thanks to pgill and his many links and suggestions! Now only one problem left. Apparently the thermostat stuck open even though it only heated up the one time before I shut it off. So no heat... in the winter in Buffalo.

At least I know a ton more about this thing than I did! It's only got 199,675 miles on it so plenty of life left with a little work!

Post by **pgill** » 26 Dec 2021, 13:16

Result!!!!!

Well Done

As for the Thermostat most of the parts are the same for the S80 LR2 and XC90

The exception being the small hose in the middle of the manifold at the top

Take a look at this link

https://www.freel2.com/forum/topic32245.html (Edit: Broken link repaired)

You may be able to do the job without removing the Manifold (I think the Xc90 has more room by the Thermostat)

You can use Volvo parts or Land Rover parts but I don’t recommend aftermarket parts (I will post a video of a failed aftermarket Thermostat on a XC90 if you want to see it)

I would get these parts

LR006071 - Thermostat

LR001491 - Screw for Thermostat (Qty 4)

LR001442 - Coolant Hose for heat exchanger

LR000491 - Bolt for Heat exchanger hose

LR001505 - O-Ring for heat exchanger hose

And if you remove the manifold I would also get Victor Reinz manifold gaskets you need 6 and they are not expensive

Good luck

Paul

Capndirk · Post by **Capndirk** » 27 Dec 2021, 09:57

As pgill notes, that belt drive should turn kind of freely in one direction. Mine was seized when I replaced everything on that end of the engine, but the new one couldn't be easily turned when it was off and in my hand. I really couldn't secure the hub to turn the belt pulley without bolting the hub to something. Now, when installed, I can turn the AC pulley in one direction by hand (engine off

) .
Also noted above, is that the alternator has one-way freewheeling capability, as the alternator has a similar coupling on it. I've purchased one and plan on replacing it along with the voltage regulator and engine thermostat in the near future. Most projects on modern cars are like archeological digs, it seems.
The one-way clutches probably help with belt stress and longer service life, but there may also be a relationship to bearing wear or failure in the Rear End (Engine?) Accessory Drive, or READ unit. There's a poster in a SwedeSpeed forum that suggested that there's a cause and effect scenario, so it may be worth pursuing. The web site for the READ poster is https://www.volvoread.com

Serpentine, steering pump? Help!

Re: Serpentine, steering pump? Help!