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Replacing rear main oil seal

Discussion in 'GM 6.5 Diesel Engines' started by Tovar, Mar 12, 2018.

  1. Tovar

    Tovar Member

    Jul 23, 2016
    Need to replace my rear main oil seal. It will be my first time for such a job on this vehicle ('99 6.5 turbo diesel Chevy 3500). Can anybody point me to a start to finish procedure? Video would be great. I looked around here, but didn't see anything.
  2. NVW

    NVW Well-Known Member

    May 5, 2008
    Castor, AB.
    Likely the easiest is to remove the rear drive shaft and the shaft to the front diff. if it is 4x4. 6 bolts on the lower Bell housing as well as the brace between the passenger engine mount and that lower bell housing have to be removed. 6 bolts have to be removed from the flex plate (auto trans) and torque converter. Slide the trans. back, then remove 6 bolts from the flex pate to the crankshaft. Then remove the flex plate.

    I have never had to go beyond this, as the rest was a complete rebuild, I suspect a screw would have to be inserted into the seal so it could be pulled out. There is a special install tool recommended for the seal which I have never used either.
    Jaryd likes this.
  3. Will L.

    Will L. Well-Known Member

    Jan 25, 2013
    Boulder City Nv
    Yep. And when the new seal is installed the depth is critical. There is a special install tool for it.
    WarWagon and Jaryd like this.
  4. Tovar

    Tovar Member

    Jul 23, 2016
    Thanks guys. Very helpful.
    NVW likes this.

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