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2G Balance shaft removed (stub, shaft w/o oil groove)

Posted by 49erGizmo, Jan 21, 2021

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  1. 49erGizmo

    49erGizmo Proven Member

    52
    6
    Joined Nov 3, 2017
    Cedar Park, Texas
    Car Info: 1997 GSX Eclipse
    question? what is the purpose of removing the Balance shaft and will this cause problems in the future?
    Parts List of what's been done to car and notice this....
    Balance shaft removed (stub,shaft w/o oil groove)
     

    Street Build 209  3

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  2. idkiliketurbos

    idkiliketurbos Proven Member

    737
    73
    Joined Mar 2, 2009
    Appleton, Wisconsin

    Street Build 415  3

    1999 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  3. DSMPT

    DSMPT DSM Wiseman

    1,163
    724
    Joined Jun 12, 2014
    Japan / Mexico, Arizona
    Like @idkiliketurbos mentioned above, there is a common problem that the balance shaft belt gets cut and it goes into between timing belt and sprocket and would cause wrong valve timing and then would bend valves. By physically removing it, you can avoid this problem. And less belt = less power loss.
    Not a good idea. You can see the difference in the pic below. A stub shaft without groove most likely would end up in that way in the near future. The one without groove in the pic had way less milage, less time and less power/engine speed than the right one (Mitsubishi with groove). The difference is obvious.
    DSC_2753.JPG
     

    Drag Race Build 3K  7

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    Street Build 2K  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
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  4. 007jimmy

    007jimmy Proven Member

    1,570
    116
    Joined Feb 27, 2012
    Levittown, Pennsylvania
    0C61A8D0-5D4A-4AF1-8F30-A1182CC6CC77.jpeg CC44EF28-B9F2-4BCC-89EB-5E1A78E98EC0.jpeg
    3F831602-EEEC-442B-B5C0-50B03995CD57.jpeg F3B42B74-C61A-46A9-A8B7-CBB896304FF2.jpeg I bought a fresh built block and found this after I got some kind of weird knocking noise. Less then 5k of “very easy driving”. No bearings were spun oddly enough. Not to mention I was battling very high oil pressures the whole time. Don’t cheap out on the stub.
     

    Street Build 1K  25

    1997 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
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  5. luv2rallye

    luv2rallye DSM Wiseman

    7,851
    742
    Joined Jun 7, 2003
    Minneapolis, Minnesota
    Watch 15:35-17:25 here to see what happens with an ungrooved stubby shaft .
     

    3K  0

    1999 Mitsubishi Eclipse GST
    14.200 @ 95.000 · 2G DSM
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  6. 49erGizmo

    49erGizmo Proven Member

    52
    6
    Joined Nov 3, 2017
    Cedar Park, Texas

    I looked at videos and links so no matter what in order to replace the Stub I have to pull the motor out.
    dang time to look for a cherry/picker
     

    Street Build 209  3

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  7. luv2rallye

    luv2rallye DSM Wiseman

    7,851
    742
    Joined Jun 7, 2003
    Minneapolis, Minnesota
    No - I just replaced the entire front case (with oil pump) on my 99 GST (including removing rear balance shaft but not the front balance shaft) with the engine in the car (and have pics to prove it). It's a tight fit (and you'll have to remove the oil pan) but can be done. However you'll need this tool (MD998162) to get the plug (MD125376) off the rear balance shaft opening to remove the balance shaft's flange bolt: https://mitsubishi.service-solutions.com/Detail/15/MD998162-01-PLUG-WRENCH.
     
    Last edited: Jan 27, 2021

    3K  0

    1999 Mitsubishi Eclipse GST
    14.200 @ 95.000 · 2G DSM
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  8. jakelandry

    jakelandry Proven Member

    930
    122
    Joined Oct 13, 2009
    Minden, Louisiana
    Just to add for future searches, I also had a groove less stub shaft seize. It took out my oil pump and broke the gear in half like the link in post 2. I thought it was ok because the stub shaft came with a spec sheet that said it needed .006” clearance which I had. Mine didn’t even make it down the street before failure.
     

    4K  0

    1995 Mitsubishi Eclipse GSX
    11.410 @ 125.490 · 2G DSM
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  9. luv2rallye

    luv2rallye DSM Wiseman

    7,851
    742
    Joined Jun 7, 2003
    Minneapolis, Minnesota
    Make no mistake, using a stub shaft w/o the groove in it WILL DESTROY YOUR ENGINE due to insufficient oil pressure.
     

    3K  0

    1999 Mitsubishi Eclipse GST
    14.200 @ 95.000 · 2G DSM
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