2014 E350 Serpentine Belt sudden misalignment
Video URL:
https://drive.google.com/file/d/1aKc38zcqlpGepLjhNjiytJAuwdBMC-Tq/view?usp=drivesdk
After inspecting on multiple occasions, cold start and warm engine:
1) Crankshaft pulley seems to wobble, not excessively (correct me if I am wrong as this might be normal)
2) Idler tensioner also wobbles a tiny amount
3) The pulley which the belt is not sitting properly on doesn’t vibrate at all
Would anyone here be able to tell whether it is the crankshaft causing the belt to move or would it be the tensioner pulley causing this or is it something else? Thank you!

Last edited by Muqixo; Apr 24, 2024 at 02:17 PM.




How about your alternator pulley can you inspect freeplay with belt-off.
The two things that can missalign serpentine belt is where it's coming from and where it's going.
Let me see...




my belt aligned over pump
genuine plastic idler pulleys
Water pump is located between the ALT and an idler.
As far as engine rotation goes belt is arriving from the idler > Pump > ALT...
The tensioner is built... to require replacement, specially because it won't work well with a fresh belt.
What's your current mileage??


