Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Rear main/oil pump Q...hoping for a quick answer

Discussion in '1982-Present GM Diesel' started by tRustyK5, Sep 23, 2006.

  1. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,172
    Likes Received:
    1,381
    Location:
    E-town baby!
    OK, I have my pan off and rear main seal replaced. Yay...

    While removing the oil pump a small plastic dealie that looks like an umbrella seal broke off. After having a good look at it I can see it was originally split so it can be spread over the oil pump driver coming down from the cam. The oil pump driver has a small groove about 3/4" from the bottom that this piece rides on. What I don't understand is it's purpose. There is nothing to seal there, it's just a hex drive coming into the top of the oil pump. It's not like the oil pump can go anywhere, and it's not like the pump driver can creep up and disengage.

    My Chiltons made no mention of this piece of plastic, but I don't really want to put it back together without a replacement (if I can find one) if it serves an important purpose.

    Anyone have a clue what it is and if it's important?

    Rene
     
  2. Muddytazz

    Muddytazz 1 ton status

    Joined:
    Jun 30, 2002
    Posts:
    20,073
    Likes Received:
    0
    Location:
    Salem, Or.
    4x4high will know the answer to this one I know, pm him
     
  3. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

    Joined:
    Dec 14, 2001
    Posts:
    22,060
    Likes Received:
    69
    Location:
    Pleasanton, CA.
    Rene, that is the oil pump drive shaft sleeve. Do not run without it. In fact you can buy a performance shaft that has a steel sleeve attached with a rivet which is much better. The purpose is to keep the drive shaft aligned with the oil pump properly.
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,172
    Likes Received:
    1,381
    Location:
    E-town baby!
    Sweet info...hopefully I can find a replacement tomorrow. Looks like my night is done then. Beer time!! :D

    Thanks for the ultra quick response!! :bow:

    Rene
     
  5. BKinzey

    BKinzey 1/2 ton status

    Joined:
    Jan 13, 2006
    Posts:
    3,145
    Likes Received:
    0
    Location:
    Hollywierd, CA
    So where do you get this high performance shaft?
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,172
    Likes Received:
    1,381
    Location:
    E-town baby!
    No idea, I went to the dealer and spent a whopping $2.04 to replace the little nylon shaft alignment bushing/guide. Got her all buttoned up now and onto getting the rest of the drivetrain in.

    Rene
     
  7. Cricket

    Cricket 3/4 ton status

    Joined:
    Nov 29, 2004
    Posts:
    8,224
    Likes Received:
    0
    Location:
    Colorado

Share This Page