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Oil on valves

Started by lazylightnin717, April 07, 2015, 06:41:45 PM

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lazylightnin717

April 07, 2015, 06:41:45 PM
I'm in the process of tearing down the 02 S4 for the 24k service. 'Twas planning on valves, belts, and any flaking rockers to be taken care of.

I noticed with the TBs pulled to the side that it looked like there was oil on top of the valves. I will take a closer look tomorrow to confirm but in the meantime, I'd like some thoughts on why it may be occurring and how to fix it.
Comes a time
When the blind man takes your hand
Says don't you see
Gotta' make it somehow
On the dreams you still believe

EEL

#1
April 07, 2015, 09:37:17 PM
Where is your breather connected?

ducpainter

#2
April 08, 2015, 03:04:38 AM
Valve seals
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


lazylightnin717

#3
April 08, 2015, 04:07:55 AM
Quote from: EEL on April 07, 2015, 09:37:17 PM
Where is your breather connected?

Stock configuration.

Quote from: ducpainter on April 08, 2015, 03:04:38 AM
Valve seals

Pretty obvious answer. Have you swapped them out on a desmoquattro?
Comes a time
When the blind man takes your hand
Says don't you see
Gotta' make it somehow
On the dreams you still believe

ducpainter

#4
April 08, 2015, 04:26:53 AM
No, but I'd weigh all the circumstances before I jumped to any conclusions about them 'needing' to be replaced.

Did the bike have oil consumption issues last season?

How long did the bike sit to accumulate how much oil on the valves?

Are the seals the type that lock on to the guide, or are they the type that float on the valve stem?

Some oil on the valve stems is not necessarily a bad thing.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Howie

#5
April 08, 2015, 04:28:38 AM Last Edit: April 08, 2015, 04:30:41 AM by howie
Quote from: ducpainter on April 08, 2015, 04:26:53 AM
No, but I'd weigh all the circumstances before I jumped to any conclusions about them 'needing' to be replaced.

Did the bike have oil consumption issues last season?

How long did the bike sit to accumulate how much oil on the valves?

Are the seals the type that lock on to the guide, or are they the type that float on the valve stem?

Some oil on the valve stems is not necessarily a bad thing. DING DING!


Also, are we looking at wet unburnt oil or black residue?  Intake or both?

lazylightnin717

#6
April 08, 2015, 06:26:26 AM
Not sure about the type of seal. They looked locked into place with a small coill around the top.

The bike has been sitting for the winter. About 6 months.

It was last ridden hard for a few hundred miles in the mountains down in WV. I did notice really low oil level when I returned from the trip. I just attributed it to hard riding. The guys riding behind me confirmed no smoke.

I don't have the exhaust off to check those valves. The intake valves have both burnt and wet residue.
Comes a time
When the blind man takes your hand
Says don't you see
Gotta' make it somehow
On the dreams you still believe

ducpainter

#7
April 08, 2015, 06:42:34 AM
This is just me...

if the bike doesn't smoke, and isn't using more than a quart of oil in about 1k miles.

I'd leave it alone. It's a machine, and they use oil. Replacing valve seals might help, but if the guides are worn it's a temporary fix.

If you're the anal kind and absolutely have to find the reason the bike used a quart of oil after a season of riding...

get out the checkbook. It won't be cheap.

"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


lazylightnin717

#8
April 08, 2015, 07:13:45 AM
Trying to keep the checkbook in my pocket  ;D
Comes a time
When the blind man takes your hand
Says don't you see
Gotta' make it somehow
On the dreams you still believe

EEL

#9
April 08, 2015, 12:40:43 PM
I'd say your breather valve is pushing oil vapors into your intake valves.

ducpainter

#10
April 08, 2015, 01:57:41 PM
I believe the breather feeds into the air box on that monster, so he'd also see oil pooling there or dripping out of the air box drain.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


jduke

#11
April 08, 2015, 02:00:25 PM
If the breather is pumping oil mist into the air box and then into the engine, you have an issue that needs to be fixed.
Could be rings, guides, valve stem seals.
If the breather is dry, and the valve stem seal doesn't appear to be torn or split, then it's probably the valve guide. You can use a dial indicator to check for play if you can't feel the looseness.
Almost any automotive cylinder head shop can replace the valve guides pretty inexpensively. If you can find an old VW mechanic he can easily handle it.

ducpainter

#12
April 08, 2015, 02:15:36 PM
Get out your checkbook. The guys are spending your money. ;D
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


EEL

#13
April 08, 2015, 04:26:17 PM
Quote from: ducpainter on April 08, 2015, 01:57:41 PM
I believe the breather feeds into the air box on that monster, so he'd also see oil pooling there or dripping out of the air box drain.

Thats a very good point. I didn't think about that..

So that begs the question. Is there oil in the airbox??

Howie

#14
April 08, 2015, 05:31:50 PM
Assuming the bike was running fine before,  no blue smoke, no plug fouling, no loss of power and no excessive oil consumption you might be trying to fix something that ain't broke.  If valve guide cleared and seals are OK and there is no excessive oil in the air box I say butt [n it up and see what you got.
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