300TDI Rolling failure no start

NPT90

Well-known member
Dam. Seen water pumps do that....you took it to a new level!
I mean, it was still charging up until this bearing or shaft failure. I’m all for preventative maintenance but crazy that it worked until it was completely toast...

I think it’s the original alternator, likely has about 90-100K on it by now. Time to go 100amp. Anyone want to post their recent purchase part number? I’ve seen the threads on it, iskra looks like a decent replacement.
 

1of40

Well-known member
Great news. Seen water pumps and tension pulleys sieze up but those have always resulted in damaged serp belts. That alt was a stealthy character.
 

NPT90

Well-known member
Great news. Seen water pumps and tension pulleys sieze up but those have always resulted in damaged serp belts. That alt was a stealthy character.
Totally, huge relief, I had noticed a squeal in the front and replaced the idle pulley bearing, couldn't figure out where it was coming from. I am guessing I found the culprit :unsure:
 

4RF RDS

Well-known member
Well, sure as shit, was the alternator!

Thanks for all the replies, would have never guessed the alternator could cause such symptoms... weirdly happy to be replacing only that.

Once I pulled the serpentine belt it fired up.
Gotta love the simple stuff👍😂
 

Viton

Well-known member
Had a heck of a time, even with an air impact, getting the Alt. pulley on tight enough (I went through 3 Alt's AND pulleys) so it wouldn't spin on the shaft. These newer Alt's don't have a key/ keyway to keep them in place. They are held in place by the nut's pressure only. Be sure to paint indicator marks are the pulley & Alt. shaft & check frequently to insure it's not slipping. When they slip, it wears the ID of the pulley & the OD of the Alt. shaft, destroying both. The external fan of the cheaper Alt's can do a lot of damage too, that's why I went to the 100 Amp just to contain the fan internal to the Alt. housing.
 

NPT90

Well-known member
weird question but is it possible that I have the smaller belt on the larger pulley that caused this failure?

"ERR3287 is 1595 mm in length and suits the 61 mm pulley and ERR5911 is 1575 mm in length and suits the smaller 49 mm pulley. The belt tensioner is the same part for both belt lengths."

obviously its a tight fit but how tight should it be, I presume I wouldn't be able to get the smaller belt over the larger pulley
 
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