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Thread: Where is this oil leak most likely coming from?

  1. #1
    Join Date
    Nov 2013
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    Where is this oil leak most likely coming from?

    The VCG at the top has been changed and looks good. The OFHG has been changed and looks good.

    The front main seal is original, but the front of the pan looks pretty clean.

    The oil pan gasket is original and a bit weepy. The AC pump is located above the oil pan gasket, so Iím a bit confused where itís come from.


    Oil on AC pump




    Front of oil pan



    His: 2005 330 ZHP Imola Red - 1995 NA Miata
    Hers: 2004 330i ZSP
    2004 325 M56 Steel Blue Metallic - Sold
    Stephen's DD & AutoX/HPDE Build Thread
    Stewart WP - Z4M LCAB - M3 trans/motor mounts - DICE MediageBridge Duo - ARC-8 17x8.5"
    DrVANOS - Mason Engineering Race Strut Bar - E30 Exp. Cap - Custom Black+Beige Interior - M3 Seats
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  2. #2
    Join Date
    Nov 2017
    Location
    Irvine, CA
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    Any oil on the topside of the AC pump? How's the rest of the front of the engine, clean or oily? Exhaust-side CPS sensor oring?

  3. #3
    Join Date
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    Quote Originally Posted by Will View Post
    Any oil on the topside of the AC pump? How's the rest of the front of the engine, clean or oily? Exhaust-side CPS sensor oring?
    I found the exhaust CPS and used my mirror to confirm it is clean on all sides.

    Top side AC pump looks clean too.

    The exhaust side of the block; where the coolant drain bolt is; is very very clean. It looks new, surprisingly.


    His: 2005 330 ZHP Imola Red - 1995 NA Miata
    Hers: 2004 330i ZSP
    2004 325 M56 Steel Blue Metallic - Sold
    Stephen's DD & AutoX/HPDE Build Thread
    Stewart WP - Z4M LCAB - M3 trans/motor mounts - DICE MediageBridge Duo - ARC-8 17x8.5"
    DrVANOS - Mason Engineering Race Strut Bar - E30 Exp. Cap - Custom Black+Beige Interior - M3 Seats
    Bilstein PSS10 - Turner Sway Bars 27/21 - ECST RTAB Limiters - R.E. RSM


  4. #4
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    Everything above the harmonic balancer looks clean.

    Everything below it is oily. Looks like itís the front main seal

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Size:  1.60 MB


    His: 2005 330 ZHP Imola Red - 1995 NA Miata
    Hers: 2004 330i ZSP
    2004 325 M56 Steel Blue Metallic - Sold
    Stephen's DD & AutoX/HPDE Build Thread
    Stewart WP - Z4M LCAB - M3 trans/motor mounts - DICE MediageBridge Duo - ARC-8 17x8.5"
    DrVANOS - Mason Engineering Race Strut Bar - E30 Exp. Cap - Custom Black+Beige Interior - M3 Seats
    Bilstein PSS10 - Turner Sway Bars 27/21 - ECST RTAB Limiters - R.E. RSM


  5. #5
    Join Date
    May 2020
    Location
    Sammamish, WA
    Posts
    2
    +1 on front main seal. I just replaced mine and had similar leakage as your pictures. It was actually diagnosed at the dealer when I had the car in for the latest airbag recall. I chose to do it myself rather than pay the dealership rate.


    Mike Z.
    Summer Driver - 2006 330i Convertible 6MT, ZHP package, Titanium Silver w/black interior, silver cube trim
    Daily Driver - 2016 435i Gran Coupe AT, Alpine White w/Saddle Brown interior, M-Sport, M-Performance Track Package


  6. #6
    Join Date
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    Quote Originally Posted by zekim99 View Post
    +1 on front main seal. I just replaced mine and had similar leakage as your pictures. It was actually diagnosed at the dealer when I had the car in for the latest airbag recall. I chose to do it myself rather than pay the dealership rate.
    How long did it take you?

    Was dealing with the timing chain difficult?


    His: 2005 330 ZHP Imola Red - 1995 NA Miata
    Hers: 2004 330i ZSP
    2004 325 M56 Steel Blue Metallic - Sold
    Stephen's DD & AutoX/HPDE Build Thread
    Stewart WP - Z4M LCAB - M3 trans/motor mounts - DICE MediageBridge Duo - ARC-8 17x8.5"
    DrVANOS - Mason Engineering Race Strut Bar - E30 Exp. Cap - Custom Black+Beige Interior - M3 Seats
    Bilstein PSS10 - Turner Sway Bars 27/21 - ECST RTAB Limiters - R.E. RSM


  7. #7
    Join Date
    Nov 2016
    Location
    Charlotte, NC
    Posts
    2,764
    Silver lining - this gives you an excuse to add a chain tensioner for the oil pump!

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