GM's LS oil leakers / burners or "The 2 stroke Chevy"

Discussion in 'High Tech Retrofits' started by sbca96, Jun 11, 2014.

  1. Knuckle Dragger

    Knuckle Dragger Mayor of Simpleton Staff Member Lifetime Gold Member

    Messages:
    14,624
    Likes Received:
    1,230
    Joined:
    Nov 2, 2002
    Location:
    Waddell AZ
    If it leaks again
    [​IMG]
     
  2. sbca96

    sbca96 Veteran Member

    Messages:
    2,897
    Likes Received:
    5
    Joined:
    Oct 25, 2004
    Location:
    Santa Barbara, Ca
    OK. It is officially back among the living. Heat shield, starter and exhaust went
    in quite easy. I used anti-seize on the studs (just in case) I figure since Murphy
    pretty much lives on my back porch - if I take steps to ease taking it back apart
    ... maybe I wont have to. ;)

    I went with High Mileage Synthetic Mobil 1 and got it right under the line for the
    operating range. I had only bought 5 quarts of high mileage trans fluid, so that
    meant I couldn't drive it tonight. Tomorrow I'll drive the Avanti over to Walmart
    and buy another 5 quarts. It started right up, no weird engagement issues with
    the starter to new flex plate and no odd noises. So far so good. I let it run for
    maybe 2 minutes. No leaks yet, but its way too soon to make a call on that.

    Oh, I also used one bottle of TransX to hopefully stave off the dreaded death of
    a high miles trans right after trans service syndrome. I am tempted to add one
    more just in case. They say if the trans takes 10 or more quarts capacity you
    can use two bottles. Thoughts?

    Tom
     
    Last edited: Sep 25, 2014
  3. sbca96

    sbca96 Veteran Member

    Messages:
    2,897
    Likes Received:
    5
    Joined:
    Oct 25, 2004
    Location:
    Santa Barbara, Ca
    Back in the garage. Still leaking. Worst-engine-design-ever. Drips on the ground
    on the passenger side off the trans pan. Oil on the trans pan. As usual can not
    see where its coming from since there is zero room. Looked like it was out of the
    center hole in the bellhousing, but the back of the pan is dry. I think it might be
    coming down from above now and dripping off the bellhousing/transmission.

    This was ONE drive in town too. It took a while to drip on the floor, overnight. I
    think if the leak was down below still .. it would have spotted right away. What
    is super annoying about this design is the TOTAL lack of visual check points. It is
    impossible to see anything partly because of the LSx design and partly because
    of the F-body design. If it was my GTO I could just START it and watch with a
    flashlight to see if the cam sensor or OPS was leaking WHILE running, watch the
    part actually weep oil. With the F-body you can not DO that. I can not see in
    behind the engine at all. Mirrors, lights .. etc .. useless with the intake on. With
    the intake OFF I can not start it .. obviously.

    I guess I will take the intake off, AGAIN. Check the oil pressure and cam sensor.
    The rear seal was leaking, as was the cover, but it seems I have more than one
    leak in the back of the engine. I couldnt really get to them that well when I had
    the trans out. I thought about removing them then, but everything pointed to a
    rear seal leak and I thought leave well enough alone.

    Tom
     
  4. OsborneConst

    OsborneConst Veteran Member Lifetime Gold Member

    Messages:
    1,011
    Likes Received:
    5
    Joined:
    Oct 25, 2009
    Location:
    Kalamazoo, MI
    That stinks. I was really hoping that you had fixed it with all of the trouble you went through. A while ago when I was reading about how GM came up with the design, and why they did some of the things they did, one of their main focuses was designing an engine that wouldn't leak. I thought they had done pretty well, as 4 of my 5 current LS vehicles don't leak a drop, all with over 100,000 and one over 200,000. However the 5th one drips.... A lot. I have not been able to locate the leak. I thought I have found it on multiple occasions, but it continues to leak. I thought doing what you did was going to solve my problem, but I haven't had time to do it yet. I'm seriously thinking about selling that truck anyway, or turning it into a backup truck, as right it is the primary one my guys use. And whenever we work at a customers house, we put cardboard and drop cloths under the truck so we don't leave oil in their driveway.
     
  5. z28dug

    z28dug Veteran Member

    Messages:
    531
    Likes Received:
    1
    Joined:
    Apr 30, 2004
    Location:
    Baltimore, MD USA
    Well that certainly sucks....these 4th gen F-bodys are strange beasts. My son's 00 Z/28 leaks like yours, his 01 WS6 is dry as a bone....of course there is about a 100k difference in mileage...

    We know his Z leaks out both the rear seal and the OPS...unfortunately we don't have a pet monkey with hands small enough to reach back and replace that switch.....I know there is a place in hell for the designers of that engine placement in the 4th gen F-bodys...

    Good Luck
     
  6. mrvedit

    mrvedit Veteran Member

    Messages:
    1,355
    Likes Received:
    4
    Joined:
    Jun 12, 2009
    Location:
    Ann Arbor, MI
    The only leak I ever had was related to my aftermarket oil pressure sensor. A bad sensor or seal will cause a huge leak because it is pressurized.
     
  7. sbca96

    sbca96 Veteran Member

    Messages:
    2,897
    Likes Received:
    5
    Joined:
    Oct 25, 2004
    Location:
    Santa Barbara, Ca
    The OPS is a Delco and its recent. I replaced it because I broke the one on the
    car while taking the intake off (damn knock sensor harness). The thing is, it did
    not thread in very well. The threads are F'ed up, some numbnuts at the factory
    screwed the damn thing in wrong. I will remove it and teflon tape the F outta it.

    I will also remove the cam sensor. Is there an O-ring number for that?

    Makes me think of this quote,

    "the more they advance the plumbing the easier it is to stop up the drain" :

    [​IMG]

    Tom
     
  8. sbca96

    sbca96 Veteran Member

    Messages:
    2,897
    Likes Received:
    5
    Joined:
    Oct 25, 2004
    Location:
    Santa Barbara, Ca
    Here we go again ....

    [​IMG]

    Got the intake manifold off (again) and even with IT off I cant really SEE much in
    the back with any real clarity. Lights, mirrors ... still had to settle for feel.

    [​IMG]

    There is oil back here, but I cant FEEL a trail down the back to where it leaked
    onto the ground. I have to remove the rear crossover to remove the cam sensor
    and get an idea if that's leaking. If I remember correctly, it actually doesn't seal
    up at the top, and could be leaking from down below. That would end up inside
    the bellhousing ... right?

    [​IMG]

    Oil dripping down from the intake ports, this is the LS secret HP boost : OILY AIR!

    [​IMG]

    Slippery air increases HP (You read this on the Internet so its true!).

    [​IMG]

    [​IMG]

    There was some oil on the crush washer on the OPS.

    [​IMG]

    To that person early on that said no special tool to remove the OPS ..

    [​IMG]

    Tom
     
  9. sbca96

    sbca96 Veteran Member

    Messages:
    2,897
    Likes Received:
    5
    Joined:
    Oct 25, 2004
    Location:
    Santa Barbara, Ca
    Took the coolant crossover off, and the cam sensor plug. Oil inside the plug?
    How would the seal get oil into it? Weird.

    [​IMG]

    Cam sensor did NOT want to come out. It shows signs for oil, but its hard to
    say if it settled on the sensor from inside the bellhousing, or if it slipped past.

    [​IMG]

    [​IMG]

    [​IMG]

    Using a mirror .. I can KINDA see down the hole. Eh.

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    Just not service friendly. LT1 used the Opti for a cam sensor and the OPS was
    on the SIDE of the engine for easy access.

    [​IMG]

    Tom
     
  10. mrvedit

    mrvedit Veteran Member

    Messages:
    1,355
    Likes Received:
    4
    Joined:
    Jun 12, 2009
    Location:
    Ann Arbor, MI
    I don't see anything obvious. I do see an o-ring on your cam sensor, but it seems to be in reasonable condition. (My LS2 has a front-of-engine cam sensor.)
    Don't worry about the oil in the intake runners - I have some too; must be due to the PCV.
    I assume you have checked the rocker covers.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.