Replacing a 2007 diesel alternator. How do you release the tension on the belt tensioner? I assume the tensioner is the double pulley system below the alternator. Do I have to remove parts to get to the tensioner?
Thanks

 

You didn't say if single or dual alternator---here is single



Removal and Installation

NOTE: Single generator is shown; primary generator on the dual generator vehicle is similar.

1. Disconnect the batteries.
2. Remove the cooling fan.
3. Remove the nut and position the generator B+ terminal aside.

o To install, tighten to 8 Nm (71 lb-in) .

4. Disconnect the generator electrical connector.
5. Rotate the accessory drive belt tensioner clockwise and remove the drive belt from the generator pulley.
6. Remove the 3 bolts and the generator.

o To install, tighten to 47 Nm (35 lb-ft) .

7. To install, reverse the removal procedure.

And here is Dual



Removal and Installation

NOTE: This procedure applies to the secondary generator of the dual generator system.

1. Disconnect the batteries.
2. Loosen the 2 clamps and remove the charge air cooler (CAC) pipe.

o To install, tighten to 12 Nm (9 lb-ft) .

3. Remove the cooling fan.
4. Rotate the accessory drive belt tensioner clockwise and remove the drive belt from the generator pulley.
5. Remove the nut and position the generator B+ terminal aside.

o To install, tighten to 8 Nm (71 lb-in) .

6. Disconnect the generator electrical connector.
7. Remove the 3 bolts and the generator.

o To install, tighten to 47 Nm (35 lb-ft) .

8. To install, reverse the removal procedure.

 

Thanks OnBelay. I like how Item #2 says "Remove cooling fan" as if there's nothing to it!!! This job took me about 4 hours and I busted my Craftsman 3/8" drive torque wrench. That was the only wrench I could get on the Tensioner with a 1/2" drive adaptor. I had to use a cheater bar on the torque wrench and it busted the adjusting head off. So much for saving the installation costs!!!

I wish it had the dual alternators so I wouldn't have had to do the job. I replaced the single 110 with a 200 amp.

Thanks again!!