Results 1 to 15 of 18

Thread: 1994 K75S Water Pump Case Sealant

Hybrid View

  1. #1
    Slipster Slipster's Avatar
    Join Date
    Jun 2012
    Location
    Broken Arrow, OK
    Posts
    72

    1994 K75S Water Pump Case Sealant

    Well after a nice 500 mile ride through the Winding Stair Mountains of Southeast Oklahoma I find my K75 dripping a little oil and anti freeze from the front weep hole. At 56,000 miles it appears to be water pump rebuild time. I ordered the seals, o-rings and spacers. What sealant does everyone recommend I should use between the water pump case and the engine when I button it up?
    Expect The Unexpected

  2. #2
    Registered User
    Join Date
    Jun 2012
    Location
    Olympia, WA
    Posts
    158
    Haven't had to do the water pump yet, but I used Yamabond 4 to seal up my valve cover and oil pan.
    Tim
    Olympia, WA
    1991 K75 - 121k Miles

  3. #3
    3 Red Bricks
    Join Date
    Jan 2007
    Location
    Pleasanton, Ca.
    Posts
    3,145
    Not really recommended to use any sealant on the valve cover gasket.

    Yamabond or Three Bond 1207 on pump.



    Last edited by 98lee; 10-12-2012 at 04:47 PM.
    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

  4. #4
    Registered User
    Join Date
    Jun 2012
    Location
    Olympia, WA
    Posts
    158
    Quote Originally Posted by 98lee View Post
    Not really recommended to use any sealant on the valve cover gasket.
    Darned! Thanks, Lee.

    I did because there was already some there from previous owner service.
    Tim
    Olympia, WA
    1991 K75 - 121k Miles

  5. #5
    Registered User
    Join Date
    Sep 2007
    Posts
    1,248
    Not true. Sealant is supposed to be applied to the areas where the head meets the timing chain cover. There is often a pronounced step at this area and enough needs to be applied to fill this. It is usually neccesary to run a bead of sealant along the bottom run of the gasket. BMW uses a silicone-based sealant at the valve cover and at the water/oil pump.

    Resealing the pump requires a special tool, or some clever bodging. It's a real possibilty that you'll need a new impeller shaft, and you will also need a special spacer and water impeller. There should be a tutorial to show how this is done.

  6. #6
    Slipster Slipster's Avatar
    Join Date
    Jun 2012
    Location
    Broken Arrow, OK
    Posts
    72
    Ok got the sealant thank you. I am now prepping the pump while waiting for the parts to come in. I have a question concerning getting the old Oil and Water seals out. I assume that the gear is part of the shaft and the seals will need to be tapped out somehow from the water side. Am I correct on this. Any methods that avoid harm when doing this part of the process?

    Learning as I go is a lot nicer with the great arsenal of forum members around
    Expect The Unexpected

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •