Technical aspects of automobiles

Humorous GM TSB

I just ran across this oil consumption TSB from 2003 — Bulletin #
01-06-01-011A.  My favorite part (besides the fact that they play off
internal oil consumption as normal on new cars) is the following
paragraph telling mechanics how to check oil.  20 minute wait if you
are checking a 3.4!!! WTF?

_______________________________________________________
Not Waiting Long Enough After Running Engine to Check Oil Level

The vehicle should be allowed to sit for at least 5 minutes (20 minutes
for the 3.4 L LQ1), after the engine has been shut off, before taking
an oil level reading to assure the oil has had enough time to drain
back into the crankcase. In order to ensure accurate results, the
temperature of the oil should be close to the same temperature as the
last time the oil level was checked.
________________________________________________________

Hell, in 20 minutes your oil level would probably be *higher* on a 3.4
from the likely internal coolant leakage.

Toyota MDT in MO

.
posted by admin in Без рубрики and have Comments (7)

7 Responses to “Humorous GM TSB”

  1. admin says:

    > The vehicle should be allowed to sit for at least 5 minutes (20 minutes
    > for the 3.4 L LQ1), after the engine has been shut off, before taking

    > Hell, in 20 minutes your oil level would probably be *higher* on a 3.4
    > from the likely internal coolant leakage.

    The LQ1 is the 3.4L DOHC, not the 3.4L pushrod coolant leaker.

  2. admin says:

    Steve Mackie wrote:
    > > The vehicle should be allowed to sit for at least 5 minutes (20 minutes
    > > for the 3.4 L LQ1), after the engine has been shut off, before taking

    > > Hell, in 20 minutes your oil level would probably be *higher* on a 3.4
    > > from the likely internal coolant leakage.

    > The LQ1 is the 3.4L DOHC, not the 3.4L pushrod coolant leaker.

    Sorry, my GM code comprehension is near nil RE: "LQ1".

    Ah yes, the monsterous (in physical size) DOHC.  So, what’s the deal
    with the oil drainback time on that beast?!

    Toyota MDT in MO

  3. admin says:

    >> > The vehicle should be allowed to sit for at least 5 minutes (20 minutes
    >> > for the 3.4 L LQ1), after the engine has been shut off, before taking

    >> > Hell, in 20 minutes your oil level would probably be *higher* on a 3.4
    >> > from the likely internal coolant leakage.

    >> The LQ1 is the 3.4L DOHC, not the 3.4L pushrod coolant leaker.

    > Sorry, my GM code comprehension is near nil RE: "LQ1".

    > Ah yes, the monsterous (in physical size) DOHC.  So, what’s the deal
    > with the oil drainback time on that beast?!

    My guess is the amount of oil passages and maybe the 24 hydraulic lifters.
    The TSB may say 20 minutes, but I’ve never seen it take that long. Usually
    just a minute or two is fine, but maybe they just want to be sure. Then
    again who knows. One thing I have noticed is when I pour oil into the
    engine, it runs directly over the dipstick. Maybe the wait time is there to
    ensure there is no oil dripping onto the dipstick when you are checking it.
    If there is oil dripping, this could give a false reading of adequate oil
    when in fact there is not.

    But really though, I don’t know.

    Steve

  4. admin says:

    Steve Mackie wrote:
    > One thing I have noticed is when I pour oil into the
    > engine, it runs directly over the dipstick…
    > …this could give a false reading of
    > adequate oil when in fact there is not.

    I have noticed that unpleasant phenomenon creep into newer cars since
    the mid 90s.  Certain newer Toyotas suffer from it as well as many
    domestics I’ve seen.  It POs me to wait so long to check oil.  It’s not
    a problem when you know how much the engine holds, but for the indie
    tech that sees every different make under the sun it must be
    frustrating.  I can’t figure out why this design is becoming more
    prevalent.

    Thanks for the info,

    Toyota MDT in MO

  5. admin says:

    Comboverfish wrote:
    > I just ran across this oil consumption TSB from 2003 — Bulletin #
    > 01-06-01-011A.  My favorite part (besides the fact that they play off
    > internal oil consumption as normal on new cars) is the following
    > paragraph telling mechanics how to check oil.  20 minute wait if you
    > are checking a 3.4!!! WTF?

    GM has another engine that suffers from incorrect oil levels and
    checking procedures….the Northstar engine.  If you check it cold
    as opposed to hot, you will always overfill the engine. It also takes
    a while to drain down.  It’s actually best to slightly underfill this
    engine…..it has a capacity around 7.5 liters, so a liter here and there
    doesn’t make much difference.  Well, a liter over does, but not
    a liter under.

    Ian

  6. admin says:

    - Hide quoted text — Show quoted text -

    lugnut wrote:
    > On 28 Mar 2006 15:22:29 -0800, "Comboverfish"
    > <comboverf…@yahoo.com> wrote:

    >>I just ran across this oil consumption TSB from 2003 — Bulletin #
    >>01-06-01-011A.  My favorite part (besides the fact that they play off
    >>internal oil consumption as normal on new cars) is the following
    >>paragraph telling mechanics how to check oil.  20 minute wait if you
    >>are checking a 3.4!!! WTF?

    >>_______________________________________________________
    >>Not Waiting Long Enough After Running Engine to Check Oil Level

    >>The vehicle should be allowed to sit for at least 5 minutes (20 minutes
    >>for the 3.4 L LQ1), after the engine has been shut off, before taking
    >>an oil level reading to assure the oil has had enough time to drain
    >>back into the crankcase. In order to ensure accurate results, the
    >>temperature of the oil should be close to the same temperature as the
    >>last time the oil level was checked.
    >>________________________________________________________

    >>Hell, in 20 minutes your oil level would probably be *higher* on a 3.4

    >>from the likely internal coolant leakage.

    >>Toyota MDT in MO

    > If it takes 20 minutes or even 5 min for oil to drain back
    > to the pan, I would say the SOB has an oil circulation
    > problem to go along with any oil consumption problem.  If it
    > is at operating temp, you should be able to get a reasonable
    > level check in under a minute.

    > Lugnut

    lol…
    would it even be safe to drive that car if the engine was that slow to
    return oil to the crankcase?  wouldn’t you start pumping air eventually
    and/or the valve covers would start leaking out the pcv or something?
    At least the valve springs would run cool being totally submerged…

  7. admin says:

    - Hide quoted text — Show quoted text -

    shiden_kai wrote:
    > Comboverfish wrote:

    > > I just ran across this oil consumption TSB from 2003 — Bulletin #
    > > 01-06-01-011A.  My favorite part (besides the fact that they play off
    > > internal oil consumption as normal on new cars) is the following
    > > paragraph telling mechanics how to check oil.  20 minute wait if you
    > > are checking a 3.4!!! WTF?

    > GM has another engine that suffers from incorrect oil levels and
    > checking procedures….the Northstar engine.  If you check it cold
    > as opposed to hot, you will always overfill the engine. It also takes
    > a while to drain down.  It’s actually best to slightly underfill this
    > engine…..it has a capacity around 7.5 liters, so a liter here and there
    > doesn’t make much difference.  Well, a liter over does, but not
    > a liter under.

    > Ian

    I freaked the first time I filled one of those – back in my indie days.
     Add some oil, wait — check it — too low.  Add some oil, wait —
    check it — too low.  Add some oil, wait — check it — too low.  Add
    some oil, wait — check it — D’oh!  Too full!

    Toyota MDT in MO

Place your comment

You must be logged in to post a comment.