355 - Auxillary belt (alternator) teniosner bearing replacement? | FerrariChat
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355 Auxillary belt (alternator) teniosner bearing replacement?

Discussion in '348/355' started by johnk..., Oct 7, 2025 at 10:10 AM.

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  1. johnk...

    johnk... F1 World Champ
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    Jun 11, 2004
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    John Kreskovsky
    #1 johnk..., Oct 7, 2025 at 10:10 AM
  2. fboutlaw

    fboutlaw Formula Junior

    Dec 3, 2014
    271
    Woodside, CA
    #2 fboutlaw, Oct 7, 2025 at 10:25 AM
    Try removing the bracket that the bolt sits on.
    Remove all tension, take off the aluminum bracket with the 3x 13mm nuts. Part image attached.
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  3. spaghetti_jet

    spaghetti_jet Formula Junior

    Jan 5, 2005
    955
    Europa
    Full Name:
    Bob
    #3 spaghetti_jet, Oct 7, 2025 at 11:00 AM
    it can be done. I've done it flat on my back, on the floor, under the car.

    loosen nut 13 (do not remove it to begin with), totally remove the tensioner bolt from below, then slide the pully to the lowest position, then remove nut 13 & washer. With a combination of pushing the carrier bolt back and sliding the bearing forward you can get it out, no need to remove the aluminium carrier bracket. If you remove nut 13 first the carrier bolt will bind with the bracket, it only really goes to the lowest position if the carrier bolt is parallel with the housing.

    I see in your case that the inner race has detached from the bearing, to get the clearance you'll need to get the pully and inner race off in parallel, as if the bearing were intact, if you see what I mean.
     
  4. johnk...

    johnk... F1 World Champ
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    #4 johnk..., Oct 7, 2025 at 3:33 PM
    I follow you. :) The problem is I can't get nut 13 loose because I can't get the pulley back over the race. Anyway, I've been procrastinating having a major service. That's too much for this old man so I will probably just let the shop take care of it and get the major done. The car is now officially in storage for the winter.
     
  5. johnk...

    johnk... F1 World Champ
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    #5 johnk..., Oct 11, 2025 at 1:00 PM
    Though I give a little update. I was able to get the belt off the alternator pulley with a little effort and was then able to push the tensioner pulley over the inner race and loosen the bolt on the shaft. But the inner race was seized on the shaft so the shaft couldn't be pushed back to allow clearance for the pulley to come off. (Need to push the shaft back to give clearance between the end of the shaft and the frame, or so I assume.)
     
  6. spaghetti_jet

    spaghetti_jet Formula Junior

    Jan 5, 2005
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    Bob
    #6 spaghetti_jet, Oct 11, 2025 at 2:35 PM
    Try getting a pry bar up between the frame and the shaft the bearing is on and lever the shaft backwards. That’s what I did and I managed to get the bearing off the shaft. It didn’t take a huge amount of force, although you may have a bit more of a challenge considering the bearing is damaged.

    You could also consider applying a bit of heat to the inner race.
     
  7. johnk...

    johnk... F1 World Champ
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    #7 johnk..., Oct 11, 2025 at 3:04 PM
    Already tried prying like that. No go. Thought of heat as well but really don't want to do that lying on my back under the car. I sprayed with PB blaster and will let it soak for a couple of days. Then maybe try to get a pair of ice grips on the inner race and twist it around to get it loose on the shaft.
     
  8. bobzdar

    bobzdar F1 Veteran

    Sep 22, 2008
    6,924
    Richmond
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    Pete
    #8 bobzdar, Oct 11, 2025 at 8:03 PM
    I just removed the bracket and the whole thing came out iirc.
     
  9. johnk...

    johnk... F1 World Champ
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    #9 johnk..., Oct 12, 2025 at 3:39 AM
    Last edited: Oct 12, 2025 at 3:48 AM
    Can't remove the bracket if it won't slide forward over the shaft to clear the studs as far as I can tell. And how to get to the top bolt with the pulley on?
     

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