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2.8 Alternator replacement from underside?

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2.8 Alternator replacement from underside?

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Old 07-11-2018, 09:30 AM
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Default 2.8 Alternator replacement from underside?

What are the chances I can pull the alternator from the underside, and bypass the service position completely?
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Old 07-11-2018, 11:10 AM
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Default Oh God.

Oh God. I'm going to have to do it the proper way huh.
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Old 07-11-2018, 11:15 AM
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Originally Posted by blink View Post
What are the chances I can pull the alternator from the underside, and bypass the service position completely?
I would say slim to none.

That said, I have sneaked out alternators without going into the service position. First, disconnect the battery. Then, remove the serpentine belt. Then remove the radiator fan (a phillips head screw keeps the bracket in place. Remove the screw and the fan will release from the bracket. Lay it off to one side. Then remove the two bolts holding the alternator in place. One is IIRC 13 mm, and the other an allen bolt 6 mm. With the radiator fan removed, there is just enough room to sneak the allen bolt out. Don't ding the radiator. Loosen the nuts for the electrical connection and the old alternator should be out.

Install of the new one is reverse of the removal. No unusual tricks that I can recall.

As I recall, it took me about 90 minutes to do the job. I guess that I saved about a half hour over the service position.
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Old 07-11-2018, 11:19 AM
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Thanks george. I think I'm going to try it. I have a few days until the new alt arrives, just enough time to dread it.
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Old 07-11-2018, 01:07 PM
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Originally Posted by georgeb944 View Post
I would say slim to none.

That said, I have sneaked out alternators without going into the service position. First, disconnect the battery. Then, remove the serpentine belt. Then remove the radiator fan (a phillips head screw keeps the bracket in place. Remove the screw and the fan will release from the bracket. Lay it off to one side. Then remove the two bolts holding the alternator in place. One is IIRC 13 mm, and the other an allen bolt 6 mm. With the radiator fan removed, there is just enough room to sneak the allen bolt out. Don't ding the radiator. Loosen the nuts for the electrical connection and the old alternator should be out.

Install of the new one is reverse of the removal. No unusual tricks that I can recall.

As I recall, it took me about 90 minutes to do the job. I guess that I saved about a half hour over the service position.
That may work on the 4.2, but on the 2.7 and 2.8 service position is needed. The only way is to slide it out the front.
Consider doing a timing belt service at the same time if it's due soon.
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Old 07-11-2018, 01:25 PM
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Is there any way to know which alternator it is before pulling it? There seems to be some conflicting info out there on if the Valeo can be switched with he Bosch.
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Old 07-11-2018, 01:28 PM
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Originally Posted by blink View Post
Is there any way to know which alternator it is before pulling it? There seems to be some conflicting info out there on if the Valeo can be switched with he Bosch.
If the new alternator has the pulley with it, it doesn't matter.
Most likely you have a Valeo.
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Old 07-11-2018, 01:33 PM
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Default Woo Hoo!

That's great news! Thanks for your help!
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Old 07-12-2018, 04:30 PM
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FWIW, I have removed the alternator on my father's 2.8 Avant without going into service position... same with the starter, actually (did have to lift the engine to sneak that one past the mount). That said, it was an absolute bear to dislodge from it's position, so I'd recommend service position especially if you're unsure when the coolant was changed last. However, it can actually be done with small enough hands.
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