Forum Discussion

sehunter's avatar
sehunter
Explorer
Feb 04, 2016

8.1 Crankshaft pulley

I don't remember if I posted this here or not but here's a picture of my pulley. As you can see the outer half started sliding towards my radiator. I replaced two serpentine belts before I found this and later found this is not uncommon. Just a heads up for you 8.1 guys to check this when you service your rig. Cause when mine came off I was about 5 miles from home on a winding road with no power brakes or power steering. Let me tell you it was all I could do to get it home.

Class A
  • sehunter's avatar
    sehunter
    Explorer
    Feb 05, 2016
    That is correct it is the harmonic balancer. There are special tools to remove and install with one bolt.
  • rgatijnet1's avatar
    rgatijnet1
    Explorer III
    Feb 04, 2016
    Yep, that is the harmonic balancer which have been around for decades. They have been known to fail and can destroy a radiator when they do. The newer balancers are better than the old ones but this is still a press fit on to a flexible joint and they will eventually fail. Way back when you could tell the balance was starting to fail because your timing marks would start to shift.
  • jfkmk's avatar
    jfkmk
    Explorer
    Feb 04, 2016
    I believe this is the harmonic balancer. It's not uncommon for the rubber insulator to fail after a while, and you're seeing the result.
  • Mote's avatar
    Mote
    Explorer
    Feb 04, 2016
    What caused it to slide ? Is there one big nut holding it on ?

    The reason I ask is because we are going to look at a 2003 Allegro on the workhorse chassis.

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