1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Top hat rubber gasket bulging, Bilstein 6112

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Hook78, Mar 24, 2022.

  1. Mar 24, 2022 at 12:29 PM
    #1
    Hook78

    Hook78 [OP] Well-Known Member

    Joined:
    Dec 3, 2017
    Member:
    #237571
    Messages:
    3,706
    Gender:
    Male
    Eastern NC
    Vehicle:
    2015 DCSB TRD OR
    Bilstein 6112/5160 Icon RXT
    I installed Bilstein 6112s a couple weeks ago, 4th setting, assembled them myself with new top hats.

    Today I was measuring the ride height and noticed that the driver’s side rubber gasket between the coil and the top hat is bulging out from under the top hat. The other side doesn’t have this issue and looks perfect.

    Do I need to get this fixed/reseated/reinstalled? What would cause this?

    17E9CF9E-3939-441E-9AF8-6EE2FF5C40B8.jpg 55A5F16C-344C-4362-8E19-FC181EF3A6B6.jpg
     
    tacotoe likes this.
  2. Mar 24, 2022 at 12:37 PM
    #2
    Superdave1.0

    Superdave1.0 Grandma Dave

    Joined:
    Dec 27, 2018
    Member:
    #277158
    Messages:
    4,357
    Gender:
    Male
    SoCal
    Vehicle:
    LX470
    It is likely from assembly. The center of the top hat bushing has a lip that rides inside the inner diameter of the coil spring. Often times upon assembly it gets caught and isn't fully seated inside the coil spring.

    fde2e1d1e061226b51b7fba4d3f2322e.jpg
     
    blu92in99, tacotoe and Hook78 [OP] like this.
  3. Mar 24, 2022 at 12:40 PM
    #3
    Hook78

    Hook78 [OP] Well-Known Member

    Joined:
    Dec 3, 2017
    Member:
    #237571
    Messages:
    3,706
    Gender:
    Male
    Eastern NC
    Vehicle:
    2015 DCSB TRD OR
    Bilstein 6112/5160 Icon RXT
    This makes sense. I had a hell of a time getting one of them to seat in the center of the coil due to the spring curving an awful lot during compression.

    Can this be remedied by compressing the spring while installed and reseating it against the top hat? Or does the coilover need to be removed to adjust? I’m also wondering if I need to replace the top hat if the gasket is this mashed. I assume I need to fix this.
     
    Superdave1.0 likes this.
  4. Mar 24, 2022 at 12:49 PM
    #4
    Superdave1.0

    Superdave1.0 Grandma Dave

    Joined:
    Dec 27, 2018
    Member:
    #277158
    Messages:
    4,357
    Gender:
    Male
    SoCal
    Vehicle:
    LX470
    I would remove from truck and start over to be safe. Maybe pay a shop to compress the coil spring so it goes in smooth.

    My wall mounted spring compressor makes the job easy. I have tried doing 6112 with hand spring compressors, it's a PIA that way.

    20220224_114000.jpg
     
    tacotoe and GHOST SHIP like this.
  5. Mar 24, 2022 at 12:55 PM
    #5
    Hook78

    Hook78 [OP] Well-Known Member

    Joined:
    Dec 3, 2017
    Member:
    #237571
    Messages:
    3,706
    Gender:
    Male
    Eastern NC
    Vehicle:
    2015 DCSB TRD OR
    Bilstein 6112/5160 Icon RXT
    I assembled using this spring compressor stand at the hobby shop onboard my local base. Maybe I chose the wrong spots for the arms to sit, or otherwise did a poor job. It’s a nice stand though.

    Definitely going to have a shop do the work. Thanks for the advice!

    966C9554-E92D-4F8D-A720-192BB95A0490.jpg
     
    tacotoe likes this.
  6. Mar 24, 2022 at 12:58 PM
    #6
    fourfourone

    fourfourone Well-Known Member

    Joined:
    Mar 12, 2020
    Member:
    #321977
    Messages:
    1,101
    Gender:
    Male
    Vehicle:
    2015 TRD sport 2018 SR5
    Both mine did that after I drove on the new suspension for a bit. Used brand new KYB top hats. No issues in 25k miles and I lightly wheel the truck too. The rubber seemed a bit softer on the KYB top hats. Boths coils were seated properly.
     
  7. Mar 24, 2022 at 1:10 PM
    #7
    fourfourone

    fourfourone Well-Known Member

    Joined:
    Mar 12, 2020
    Member:
    #321977
    Messages:
    1,101
    Gender:
    Male
    Vehicle:
    2015 TRD sport 2018 SR5
  8. Mar 24, 2022 at 3:06 PM
    #8
    Hook78

    Hook78 [OP] Well-Known Member

    Joined:
    Dec 3, 2017
    Member:
    #237571
    Messages:
    3,706
    Gender:
    Male
    Eastern NC
    Vehicle:
    2015 DCSB TRD OR
    Bilstein 6112/5160 Icon RXT
    I don’t know, there are tons of photos there of the KYB’s looking “normal” with no gasket pouring out. But yeah could be that it’s in the backside. I’m having a shop take a look at it. Wish I could tell whether or not the inside of the gasket is pinched as Super Dave said.
     
  9. Mar 25, 2022 at 6:26 AM
    #9
    fourfourone

    fourfourone Well-Known Member

    Joined:
    Mar 12, 2020
    Member:
    #321977
    Messages:
    1,101
    Gender:
    Male
    Vehicle:
    2015 TRD sport 2018 SR5
    The tons of photos are either of the shock not installed yet or freshly put on the truck. The bulging doesn't happen until you drive on them for a bit. I promise you they are seated right.
     
  10. Mar 30, 2022 at 1:30 PM
    #10
    Hook78

    Hook78 [OP] Well-Known Member

    Joined:
    Dec 3, 2017
    Member:
    #237571
    Messages:
    3,706
    Gender:
    Male
    Eastern NC
    Vehicle:
    2015 DCSB TRD OR
    Bilstein 6112/5160 Icon RXT
    So three weeks after install only the one bushing/gasket is bulging. Definitely an install error.

    I’m buying a new top hat and having a local shop reseat with new tophat. Just in case the bushing/gasket has become permanently deformed from pinching. Quoted an hour of labor, not bad.
     
    Last edited: Mar 30, 2022
    Superdave1.0 likes this.

Products Discussed in

To Top