FLywheel input shaft bearing

Discussion in 'PSI Superchargers Tech Questions' started by Bob69, Feb 13, 2010.

  1. Bob69

    Bob69 Member

    Joined:
    Jul 31, 2007
    Messages:
    151
    Likes Received:
    0
    I thought I didnt have a problem, but now I do.
    Using a single sided sheilded bearing in a triple disk promod.
    We are chewing up bearings from the ingestion of clutch dust.
    We also use a machined "T" hat the gets pushed into bearing centre. Imput shaft is starting to spin inside hat.
    Tried using graphite, bearings seem to fail sooner.
    Can has been checked for running centred on crank.
    What am I doing wrong.
     
    #1
    Bob69, Feb 13, 2010
  2. Mike Canter

    Mike Canter Top Dragster
    Staff Member

    Joined:
    Mar 10, 2004
    Messages:
    4,630
    Likes Received:
    189
    I don't think it is the clutch dust or we would all have that problem. The only time that shaft spins in that bearing is when the clutch pedal is to the floor or the clutch is slipping. My guess is that the shaft shoulder is pushing tight against the bearing. We had to put our shaft in a lathe and cut back the splinned area to give clearance. Leave the clutch hat and discs out and put the can back on with just the flywheel there. Put the transmission on with the input shaft and bolt it up. Now reach through the can's inspection hole and push the shaft back and forth and see if there is any play. If it is too tight it will push against the bearing and screw it up. If I remember correctly Lenco say there should be .060 to .090" play.
     
    #2
    Mike Canter, Feb 13, 2010
  3. Wayne Butler

    Wayne Butler Member

    Joined:
    Sep 4, 2007
    Messages:
    119
    Likes Received:
    0
    You need to check this in high gear (shifted) It helps if the front seal is out of the trans.
     
    #3
    Wayne Butler, Feb 13, 2010
  4. Bob69

    Bob69 Member

    Joined:
    Jul 31, 2007
    Messages:
    151
    Likes Received:
    0
    Appreciated guys, current clearance is .075 on input shaft to crank in top gear.
     
    #4
    Bob69, Feb 13, 2010
  5. Mike Canter

    Mike Canter Top Dragster
    Staff Member

    Joined:
    Mar 10, 2004
    Messages:
    4,630
    Likes Received:
    189
    Is it a bearing or a bushing? What are the indications when it goes bad?
     
    #5
    Mike Canter, Feb 13, 2010
  6. Bob69

    Bob69 Member

    Joined:
    Jul 31, 2007
    Messages:
    151
    Likes Received:
    0
    It is a bearing with insert to size correctly for input shaft.

    Will I get away with using a fully sealed bearing that has plastic type seals? Or will it melt from clutch heat.
    Cheers
     
    #6
    Bob69, Feb 14, 2010
  7. Mike Canter

    Mike Canter Top Dragster
    Staff Member

    Joined:
    Mar 10, 2004
    Messages:
    4,630
    Likes Received:
    189
    There are fully sealed bearings that will take high temps. call these guys and tell them what you are looking for http://www.bearingplace.com/

    What are the indications that the bearing has gone bad
     
    #7
    Mike Canter, Feb 14, 2010
  8. Bob69

    Bob69 Member

    Joined:
    Jul 31, 2007
    Messages:
    151
    Likes Received:
    0
    Its very gritty while its turns by hand, in fact when first pulled out it hardley turned at all, only after cleaning.
    cheers
     
    #8
    Bob69, Feb 15, 2010
  9. SoDak

    SoDak Active Member

    Joined:
    Dec 29, 2006
    Messages:
    1,524
    Likes Received:
    3
    Could it be too tight of a press fit?
     
    #9
    SoDak, Feb 15, 2010
  10. Bob69

    Bob69 Member

    Joined:
    Jul 31, 2007
    Messages:
    151
    Likes Received:
    0
    Thanks for the help guys.
    I installed a double sealed plastic type cover bearing. I figure that the dust is getting in so i will keep the grease in the bearing.
    Bearing turns ok when installed.
    Will find out again this weekend, and take spares.
    Cheers
     
    #10
    Bob69, Feb 16, 2010
  11. shawn davis

    shawn davis Member

    Joined:
    Feb 27, 2004
    Messages:
    658
    Likes Received:
    0
    I was tearing up some bearings, had em in the end of the crank though. found the id of the crank out of round and was killing the bearing.
    All the ones I have run were sealed
     
    #11
    shawn davis, Feb 18, 2010
  12. JustinatAce

    JustinatAce Member

    Joined:
    Oct 20, 2008
    Messages:
    599
    Likes Received:
    9
    It's not the clutch dust. When it gets burned off the clutch, the dust is essentially statically charged graphite.

    Check your pilot bearing hole on the flywheel and make sure it is not oblong. Also, you said the can was checked to be running centered on the crank. How did you check? I've seen before where it will seem centered but once the transmission is in place, the can sags. If the whole assembly is not centered on and perfectly perpendicular to the flywheel, this will start happening. You may also start seeing your pressure plate heat shield look like it is wearing closer to the O.D. than your flywheel heat shield.
     
    #12
    JustinatAce, Feb 18, 2010

Share This Page





XenPorta 2 PRO © Jason Axelrod from 8WAYRUN.COM