[s-cars] Borescope'ing the oil pick-up

Fri Sep 17 05:53:02 PDT 2010

Dave, you're referring to these
here<http://www.034motorsport.com/engine-components-audi-i5-rod-bearings-rs2-audi-i5-spec-p-498.html>,
correct?

I already have red and green Plastigage strips..

I figured it would be prudent to drop the pan first, being I bought this
longblock used and dont know it's history, but I would love to get a jump on
parts and keep this a one day job.

thanks for your help, Brian

On Thu, Sep 16, 2010 at 4:58 PM, <djdawson2 at aol.com> wrote:

>  Call 034.  You want the bearings with the hardened upper shell.  The
> measurements won't matter... you need the standard size if replacing them
> is even an option.
>
> I say this with certainty because the Audi cranks are so hard, grinding
> them to an undersize is virtually not doable.
>
> When you replace the bearings, take measurements with plasti-gauge.  It
> will either come within spec, or it won't if the rod or crank has been
> damaged.  Make a good visual inspection of the crank surface... run a penny
> across the bearing surface to feel for marring.
>
> The cranks are so tough that I doubt there will be an issue there... the
> question will be the rod end.
>
> You might want to start a new thread if you're going to do this work...
> happy to answer questions along the way if you have them.  This may sound
> like a huge job, but it really isn't bad at all.  You should be able to be
> in and out of there in a day... I did this about a year ago, and got it done
> in about 5 hours from start to running again.
>
>
>
>  -----Original Message-----
> From: brian hoeft <qweblog at gmail.com>
> To: Tim Dahm <tim.dahm at gmail.com>
> Cc: djdawson2 at aol.com; s-car-list at audifans.com
> Sent: Thu, Sep 16, 2010 2:23 pm
> Subject: Re: [s-cars] Borescope'ing the oil pick-up
>
>  Im a little aggravated at facing reality, but thanks none the less.
>
> Maybe I should start a new thread, but is there a particular bearing I
> should start looking for? I dont have measurements yet obviously, but would
> make sure I can get a particular manufacturers.
>
>
>
>
>
>
> On Thu, Sep 16, 2010 at 4:01 PM, Tim Dahm <tim.dahm at gmail.com> wrote:
>
>> What Dave said..  Experienced it first hand in a SHO (Taurus rustbucket).
>> Rod knock most apparent when engine is at that load/no load transition.
>> Louder when oil is hot/thin.
>> Stop running engine now.  If you don't want to pull anything apart to
>> diagnose, an oil analysis will tell you the story.  In my case a dip stick
>> inspection with a magnifying loupe showed plenty of metal in the oil.   I
>> was able to slip new rod bearings in with the engine/crank in the car.  The
>> new bearings just about doubled hot oil pressure at idle.  Lasted more than
>> long enough to get rid of that car.
>>
>> Tim
>> 93/94/94 S4s
>> 91 cq
>>
>>   On Thu, Sep 16, 2010 at 2:19 PM, <djdawson2 at aol.com> wrote:
>>
>>>
>>>  You gotta do what you gotta do.... but if it were me, I wouldn't run
>>> that car another second if you suspect a slight rod knock.  There is an
>>> outside chance that a bearing is starting to go, and that the crank surface
>>> is still good, and the big end of the rod is not out of round.
>>>
>>> If the stars align and the above is true, you could change your rod
>>> bearings, re-check you clearances, and be down the road for $150 and some
>>> elbow grease.
>>>
>>> If you run it further, you may be pulling your engine for a rebuild.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: brian hoeft <qweblog at gmail.com>
>>> To: djdawson2 at aol.com
>>> Cc: fastscirocco_2000 at yahoo.com; s-car-list at audifans.com
>>>   Sent: Thu, Sep 16, 2010 1:05 pm
>>> Subject: Re: [s-cars] Borescope'ing the oil pick-up
>>>
>>>
>>> I agree. What I figured is that things would look good in there with the
>>> scope, meaning clean. Soo, I would then know I had to schedule down time in
>>> my garage to get it sorted.
>>>
>>> Visiting someone I talk with when I get the chance, while I drain my oil
>>> (even into a clean jug, so i can pour it back in) and dig on his fancy
>>> tools, sounded better to me than dropping the pan and having a tied up
>>> garage for a week, being I could delay for a week and beter schedule the
>>> time.
>>>
>>> -Brian
>>>
>>>
>>>
>>>
>>>
>>> On Thu, Sep 16, 2010 at 2:50 PM,  <djdawson2 at aol.com> wrote:
>>>
>>> OK....
>>>
>>> Now I really don't care about your control arm bushings, or any other
>>> front end hardware.  You need to pull your pan, and you need to measure your
>>> con rod clearances.  If it is in fact rod noise, you may still have a chance
>>> of being able to sort this out with the engine still in the car.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: brian hoeft <qweblog at gmail.com>
>>> To: djdawson2 at aol.com
>>> Cc: fastscirocco_2000 at yahoo.com; s-car-list at audifans.com
>>>
>>>
>>>
>>> Sent: Thu, Sep 16, 2010 12:40 pm
>>> Subject: Re: [s-cars] Borescope'ing the oil pick-up
>>>
>>>
>>> //Siiiigh,
>>>
>>> Theres a noticable, what sounds to me like a rod knock, slightly below
>>> and into 3k RPM..
>>>
>>> It doesnt happen at all when cold cold and oil pressure is steady high.
>>> It doesnt happen under boost (at least not noticably, yet)(did I say
>>> yet..oops) or deceleration. Once warmed and light on the throttle it is
>>> quite apparent to me, but I did have to point it out to my friend.
>>>
>>> kinda wanna puke, kinda staying optimistic, but im pretty confident Lucas
>>> and Amsoil are not the cure..
>>>
>>> -Brian
>>>
>>>
>>>
>>>
>>> On Thu, Sep 16, 2010 at 1:00 PM,  <djdawson2 at aol.com> wrote:
>>>
>>>  No doubt your experience may have been different, but I got mine out
>>> just pulling the front bolts.
>>>
>>> Back to the original issue... what makes you think your pickup might have
>>> issues?
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: brian hoeft <qweblog at gmail.com>
>>> To: djdawson2 at aol.com
>>> Cc: fastscirocco_2000 at yahoo.com; s-car-list at audifans.com
>>>
>>>
>>>
>>> Sent: Thu, Sep 16, 2010 10:49 am
>>> Subject: Re: [s-cars] Borescope'ing the oil pick-up
>>>
>>>
>>> Not saying remove the control arms, but break the bolts free & drop down
>>> along with the 2 front and 2 rear sub-frame bolts.
>>>
>>> I thought the CA bolts went through the sub, into the body. I dont
>>> remember getting enough play out of just dropping the front like you
>>> suggest. Or maybe I was uncomfortable with the stress I was putting what
>>> remained attached.
>>>
>>> Whatever the case, I do remember trying to be minimal about removing the
>>> oil pan and it turning into more than just two front sub bolts to get it
>>> out.
>>>
>>> -Brian
>>>
>>>
>>>
>>>
>>>
>>> On Thu, Sep 16, 2010 at 12:27 AM,  <djdawson2 at aol.com> wrote:
>>>
>>>  I never said anything about removing your control arms...
>>>
>>> Seriously, you can get the oil pan out by just dropping the front of the
>>> subframe... no need to touch the control arm points.  BTDT...
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: brian hoeft <qweblog at gmail.com>
>>>
>>>
>>>
>>> To: djdawson2 at aol.com
>>> Cc: fastscirocco_2000 at yahoo.com; s-car-list at audifans.com
>>> Sent: Wed, Sep 15, 2010 8:41 pm
>>> Subject: Re: [s-cars] Borescope'ing the oil pick-up
>>>
>>>
>>> I know, but I just replaced the control arms and im a hardware freak.
>>> "Always replace" may not mean always, as I remember you speaking to before,
>>> but my policy is to replace them every other time and they've all been
>>> re-torqued once..
>>>
>>> -Brian
>>>
>>>
>>>
>>>
>>> On Wed, Sep 15, 2010 at 10:32 PM,  <djdawson2 at aol.com> wrote:
>>>
>>>  If you've got that sort of concern, I'd just drop the oil pan... it
>>> isn't that rough.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: chris chambers <fastscirocco_2000 at yahoo.com>
>>> To: brian hoeft <qweblog at gmail.com>; liSt <s-car-list at audifans.com>
>>> Sent: Wed, Sep 15, 2010 8:07 pm
>>> Subject: Re: [s-cars] Borescope'ing the oil pick-up
>>>
>>>
>>> Brian,
>>>
>>> 17-3 of the AAN engine manual shows the pick up in illustration 17-303,
>>> looks to
>>>
>>> be in the front to me.
>>> Here is a link where you can download the manual in pdf format.
>>>
>>> http://s2-audi.co.uk/workshop/aan/aan.pdf
>>>
>>> HTH
>>> Chris
>>>
>>>
>>>
>>> ________________________________
>>> From: brian hoeft <qweblog at gmail.com>
>>> To: liSt <s-car-list at audifans.com>
>>> Sent: Wed, September 15, 2010 9:58:13 PM
>>> Subject: [s-cars] Borescope'ing the oil pick-up
>>>
>>> Hi list,
>>>
>>> I am concerned that I may have a contaminated engine oil pick-up screen.
>>>
>>> Wondering if anyone has had any success using a borescope in the oil pan.
>>>
>>> I forget, but ithought the AAN pick-up is in the front of the pan, but
>>> forget if the baffles, however minimal, or dimensions make using a
>>> borescope
>>> for this task even possible, going in through the drain plug hole.
>>>
>>> A colleague of mine has a snap-on borescope with fancy lighting effects,
>>> but
>>> if it cant even contort into place, whats the point.
>>>
>>> Just typing to know if theres any BTDT for this scenario.
>>>
>>> thanks, Brian
>>>
>>>
>>>
>>>
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>>>
>>>
>>>
>>>
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>>
>>
>
>
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> http://208.53.138.125:8068/
>  [blinders off&earplugs out]
>

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 [blinders off&earplugs out]