300tdi alternator wailing

[Don 130]

As above, my alternator is unhappy, and stiff to turn by hand. Is this someting I get and fit new bearings for, or do I buy another. This is my going to work chariot, so the least time off the road the better. Thanks for any advise, and a happy new year to all.
Don.

[jboot51]

If it is the original 70 amp defender alt then the bearing at the rear cant be changed.
If it has been upgraded with a 100 amp disco alt the yes the bearings are doable

[Don 130]

Thanks, Jboot, I'll get one ordered in the morning and hope it all holds together still I can change it over. By the way, what is the advantage of the disco one? higher amperage, but what does that achieve?
Don.

[4bee]

It will depend on what electrical loads you have or need, 100A is better than 70A.

[jboot51]

If you get the disco alternator you will need a disco belt, as the pulley is smaller.

As 4bee said, its the load connected.
I had dual Lifeline batteries which absorbed 90 amps combined for about 30 seconds after starting the engine.
Didn't think a short term overload would hurt.
The 70 amp finally needed bearings and when I pulled it down the rotor had been overheated,discoloured.

[rangieman]

You can swap the disco pulley to the Defender then you retain the Defender belt [wink11]
Easy to do with a rattle gun air or electric [thumbsupbig]

[jboot51]

You can swap the disco pulley to the Defender then you retain the Defender belt [wink11]
Easy to do with a rattle gun air or electric [thumbsupbig]
Yes, so they say.
My defender pulley was tappered,
Brand new disco alt had a keyway, no swapping was going to work.

[Red90]

There are different model alternators so it matters which one you get.

[weeds]

I just went with Disco Belt......

[Don 130]

Thanks all, I ordered a Disco 100 amp job this morning, along with a Disco belt. We'll see what happens when the gear turns up. I hope it all fits. The mob I ordered from didn't have a Defender one in stock, and my usual supplier didn't answer the phone, even though the web suggested they would open their doors at 8:30 this morning.
I'll swap the pulley and retain the Defender belt if possible, to avoid future confusion.
Don.

[Robmacca]

Thanks all, I ordered a Disco 100 amp job this morning, along with a Disco belt. We'll see what happens when the gear turns up. I hope it all fits. The mob I ordered from didn't have a Defender one in stock, and my usual supplier didn't answer the phone, even though the web suggested they would open their doors at 8:30 this morning.
I'll swap the pulley and retain the Defender belt if possible, to avoid future confusion.
Don.

I think the pulley size difference is 49mm vs 61mm in diameter ??