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Oil pump seized

Posted by 503oneG, Oct 1, 2020

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  1. 503oneG

    503oneG Probationary Member

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    Joined Sep 25, 2020
    Beaverton, Oregon
    So I tore down my block last night and found #2 rod welded to the crank. During inspection I noticed the oil pump was extremely hard to turn. This car is new to me, I have new short block with a good crank but What I’m wondering, is it possible that the balance shaft delete kit caused the oil pump to fail? I’m debating keeping balance shafts on this new block
     

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    Last edited by a moderator: Oct 4, 2020
  2. OLDDOOD

    OLDDOOD Proven Member

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    Joined Apr 11, 2019
    Janesville, Wisconsin
    If it used the delete stubby shaft without the oiling groove, then it absolutely could cause the oil pump to seize. The cheap aftermarket stubby shafts don’t have the oiling groove. OEM does. Search on here to find the visual difference
     

    176  1

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  3. delta448

    delta448 DSM Wiseman

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    Clarksburg, West Virginia
    race_bs_pic[1].JPG Awhile back it was a popular thing to have the oil pump balance shaft turned in a lathe to remove the counterweight portion but retain the long shaft. This was done in order to support the pump better -as opposed to having a stubby shaft with much less rotational inertia.

    With aftermarket parts of questionable quality being used for bs deletes, I think this might become popular again.
     
    Last edited: Oct 1, 2020

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    1998 Eagle Talon TSi AWD
    awd · manual · 2G DSM

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    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  4. Mech Addict

    Mech Addict Supporting Member

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    Joined Jun 9, 2019
    Jackson, Wyoming
    Does the b/s delete really equate to significant performance gains? Or is this presumed on some theory, and now everyone who wants to go fast proceeds with this rather simple mod? I’m honestly asking, since this seems like a hugely popular item. Frankly I love how smooth the 4g63 runs in stock form. I’ve owned 4-cyl motorcycles and cars, and they all had a certain amount of characteristic harshness (especially Subaru), except my eclipse, which has a similar sound, but not the harsh feel. I would not sacrifice that unless the power jump were sizable, and the longevity left intact.
     

    Street Build 610  6

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM
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  5. motomattx

    motomattx Proven Member

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    wampum, Pennsylvania
    The balance shafts are not eliminated for power gains at all, they are eliminated to eliminate balance shaft bearing failure and subsequent engine failure.
     

    Drag Race Build 4K  10  24

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

    ThunderChild Supporting VIP

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    Rathdrum, Idaho
    Correct, but I'd say it's more to delete the balance shaft belt, less so for the bearings, but that is one less failure point.

    I am a fan of the cut down OEM shafts as @delta448 posted, but on the past couple engines I've used oem shafts cut down to just the stubs and had no issues.

    Most of the issue with balance shaft eliminations are the non-grooved stub shaft and improper timing belt tension (too tight).
     

    Street Build 979  3

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

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    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

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

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    1992 Eagle Talon TSi AWD
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    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  7. 503oneG

    503oneG Probationary Member

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    Beaverton, Oregon
    isnt the timing belt tensioned via tensioner?
     
  8. OLDDOOD

    OLDDOOD Proven Member

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    Joined Apr 11, 2019
    Janesville, Wisconsin
    Yes
     

    176  1

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    awd · manual · 1G DSM
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  9. pauleyman

    pauleyman DSM Wiseman

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    oklahoma city, Oklahoma
    You can still get it too tight. Thats why there is a measurement.
     

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  10. 503oneG

    503oneG Probationary Member

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    Joined Sep 25, 2020
    Beaverton, Oregon
    Thanks for all the input.
     
    Dericsh likes this.

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