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2G 46g3t Manual crank turning

Posted by drthorp, Dec 10, 2019

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  1. drthorp

    drthorp Probationary Member

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    Been doing a some work on my '96 gsx (timing, water pump, crank/cam front seals, etc.) and while turning my crank to align the timing marks and it wasn't really difficult to turn by any means but the was more resistance at some times than others. I have all the spark plugs pulled but I have the oil pump and timing belt installed. The car was running strong before I ever started taking it apart so if there is an issue, I might could catch it early, or is this sort of resistance normal? Note: I am lubricating the cams the best I can before turning the engine at all.
     

    124  1

    1996 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  2. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Joined Nov 14, 2013
    Independence, Kansas
    As the rotation comes to the point you are compressing valve springs, it will get more resistance while turning the crank over. That part is normal.
     

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  3. drthorp

    drthorp Probationary Member

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    Trussville, Alabama
    I figured that was part of it since the engine ran like a top literally like two weeks ago. Also When I do rotate the engine and just as I overcome this resistance (I guess where the valve springs are decompressing or whatever) I hear a small "whooo" sound like that of a empty bottle when you blow on it. I know in my g35 this noise is kind of normal based on acoustics with good compression, but is this a sign of worn rings or bent valves? Its a subtle sound and seems to be air driven, just curious to know if you've ever heard/diagnosed this sound before.
     

    124  1

    1996 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  4. Kryndon

    Kryndon Proven Member

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    Yep, absolutely normal. Usually when assembling you first check if the crank rotates absolutely freely while just sitting in the girdle with a bit of oil and the bearings installed, no rods or anything attached. Then you try rotating it again once the rods/pistons are all in place, again to check for any problems. And the last step is to check how it all rotates once the head is on with valves/springs etc. As Marty said, there should be more resistance as some of the valve springs start to get compressed.

    During all those 3 checks it's easy to determine if there's indeed a problem with the rotation of parts and any binding.
     

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    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  5. motomattx

    motomattx Proven Member

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    Even with the spark plugs out you will still have crankcase compression and that is what you are likely hearing, the air moving between the bottom end and the top end.
     

    Drag Race Build 3K  24

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  6. drthorp

    drthorp Probationary Member

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    Joined Oct 22, 2019
    Trussville, Alabama
    Ok that makes sense I just wanted to make sure my assumptions are correct. Time to pull some cams.... thanks guys!
     

    124  1

    1996 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  7. drthorp

    drthorp Probationary Member

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    Joined Oct 22, 2019
    Trussville, Alabama
    Quick question...the oil pump sprocket has a small circle on it that looks like a timing mark of some kind, but in the manual it looks like there is supposed to be the actual timing mark on the other side of the sprocket (180 degrees off of the circle mark). Just wondering If maybe there used to be a mark that wore away or if the actual indented circle(dot) marking is supposed to be lined up with the timing mark... I can get pictures if im being unclear.
     

    124  1

    1996 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  8. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Joined Nov 14, 2013
    Independence, Kansas
    Get us a picture so we are sure. My oil pump sprocket has a small triangle on it only, for the timing mark. I have all 1g 6 bolts though.
     

    Street Build 4K  27

    1992 Eagle Talon TSi AWD
    awd · automatic · 1G DSM

    658  14

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    487  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 695  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 5K  11  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
    Loading...
  9. drthorp

    drthorp Probationary Member

    27
    11
    Joined Oct 22, 2019
    Trussville, Alabama
    Ill post a picture when I get home for clarification. Stay tuned!
     

    124  1

    1996 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Loading...
  10. drthorp

    drthorp Probationary Member

    27
    11
    Joined Oct 22, 2019
    Trussville, Alabama
    Here’s what I’m working with. Just a little confused as to why I’m seeing different things. This is the 96 service manual and everything...
     

    Attached Files:

    124  1

    1996 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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