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Coolant Overflow Tank question (99 Eclipse GST Spyder)

Posted by Ben W, Apr 7, 2020

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  1. Ben W

    Ben W Probationary Member

    Joined Mar 7, 2017
    Camp Lejeune, North Carolina
    The cap to my coolant overflow tank is slightly cracked
    Not critically, but, when the engine starts getting hot (normal hot) the pressure causes coolant to spray out of the crack instead of cycling back into the radiator

    I used some bonding stuff to cover it up and seal it, and it held for a few months, but now its coming through the bonding material too

    Anyways, im having trouble finding the specific overflow tank cap (or even new tank) I need
    Any google search returns me this:
    These "L-Shaped" ones don't fit (even ordered one and tried it) as they collide with my air intake

    The one I need is this one:

    It sits vertically, long-wise
    Unfortunately, this seller doesn't seem to have a cap, the KEY part that needs replacing

    Any advice?

    Thanks in advance
  2. ThunderChild

    ThunderChild Supporting VIP

    Joined Jan 5, 2012
    Rathdrum, Idaho

    Street Build 710  3

    1990 Plymouth Laser N/T
    fwd · manual · 1G DSM

    696  8

    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

    Street Build 1K  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

    2K  0

    1992 Eagle Talon TSi AWD
    manual · 1G DSM

    Street Build 3K  10

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
  3. Mello

    Mello Proven Member

    Joined Jul 4, 2003
    Albuquerque, New Mexico
    If it's only the cap that cracked you might consider getting some of this stuff to repair it. I've used it on plastics & it will not come loose over time.
  4. jinscho

    jinscho Proven Member

    Joined Jun 16, 2017
    Bangor, Pennsylvania
    Norbert from DSM Partout should have a tank and cap. PM me and I'll give you his cell phone number.

    Street Build 2K  13

    1999 Mitsubishi Eclipse Spyder N/T
    fwd · manual · 2G DSM
  5. Ben W

    Ben W Probationary Member

    Joined Mar 7, 2017
    Camp Lejeune, North Carolina
    That LOOKS like the stuff I used
    Was putting it on with a buddy and he was saying the same thing

    The only thing is NOW, the cap is covered in that crap
    I could keep layering it, I suppose
    But its ugly af, and id rather replace
  6. Mello

    Mello Proven Member

    Joined Jul 4, 2003
    Albuquerque, New Mexico
    Use some elbow grease & clean it up. You can sand, file, drill, tap, & paint this stuff. It's freakin' strong, tough stuff.
  7. Bo0sTeD 4G63

    Bo0sTeD 4G63 Supporting Member

    Joined Aug 31, 2008
    Miami, Florida
    Why don't you just go with an aftermarket reservoir tank? Have you tried miller import parts, junk yard, performance part out or rix racing.

    Street Build 1K  1

    1997 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
  8. DSMPT

    DSMPT Proven Member

    Joined Jun 12, 2014
    Japan / Mexico, Arizona
    Just FYI, if you want a new OEM. The cap is MR162881 and the tank assy is MR239788. They are discontinued but it seems some warehouses in Japan still have them in stock.

    Drag Race Build 2K  3

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    Street Build 2K  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
  9. jed344

    jed344 Supporting VIP

    Joined Jan 10, 2008
    Waterville, Iowa
    Why not a aftermarket can? otherwise as listed there are some places that I bet have them. When my stock tank cracked I put a JMF one on in a more hidden location.

    1K  38

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

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