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Old 02-23-2009, 06:56 PM   #1 (permalink)
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Wanted to see if anyone had this issue. I noticed the other day while changing my oil that there is some oil running down the back side of the engine. As far as i can see the leak is coming somewhere from the top part of the engine about where the alternator or somewhere above but since there is very little space there I am unable to see where the leak is coming from. I checked the valve covers and i did not feel any oil on or below the cover. The oil eventually runs down to the oil pan. It looks like the source is below the valve cover and above both gaskets at the bottom.

During the oil change my engine oil was down to 4QT's. I have been trying to find any diagrams or pictures showing the back side of the engine but no luck

Does anyone know where the possible source could be? Maybe there is a sensor or a gasket that has the potential to cause this problem. Any help would be appreciated. Thank you.
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Old 02-23-2009, 07:52 PM   #2 (permalink)
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I assume you have a V6?

If so it is probably the PCV valve and you should expect to be replacing the engine soon.
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Old 02-23-2009, 08:06 PM   #3 (permalink)
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PCV checked no issues there. It was recently replaced. The leak seems to be coming from the other side of the engine. It's not a huge leak. The oil seems to be slowly dripping out of somewhere.
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Old 02-23-2009, 11:35 PM   #4 (permalink)
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QUOTE (DB0511 @ Feb 23 2009, 07:06 PM)
Quote:
PCV checked no issues there. It was recently replaced. The leak seems to be coming from the other side of the engine. It's not a huge leak. The oil seems to be slowly dripping out of somewhere.[/b]

Pics?
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Old 02-24-2009, 09:59 AM   #5 (permalink)
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Head gasket? Could be coming from inside a plug well? Either way, thats a lot of oil to be losing, and its unusual that you can actually see it running down the back of engine, usually its not that noticable. You need to get that into a shop ASAP.
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Old 02-24-2009, 12:20 PM   #6 (permalink)
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Could it be coming from around the timing cover (whatever the technical name is) somewhere?

It starts underneath the head and creates a seam all the way down both sides of the block, stopping around the oil pan. Oil leaking from there could certainly mimic what you're seeing... a leak from somewhere between the valve cover and oil pan, obscured by the alternator.

That's really the only thing I can think of in that area, if you're pretty sure it's not the valve cover gasket itself...

Excuse my mad MSPaint skillz... those green lines mark the areas I'm referring to. Cover has been removed in that picture...
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Old 02-24-2009, 12:32 PM   #7 (permalink)
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QUOTE (jrsy91gmc @ Feb 24 2009, 11:20 AM)
Quote:
Could it be coming from around the timing cover (whatever the technical name is) somewhere?

It starts underneath the head and creates a seam all the way down both sides of the block, stopping around the oil pan. Oil leaking from there could certainly mimic what you're seeing... a leak from somewhere between the valve cover and oil pan, obscured by the alternator.

That's really the only thing I can think of in that area, if you're pretty sure it's not the valve cover gasket itself...

Excuse my mad MSPaint skillz... those green lines mark the areas I'm referring to. Cover has been removed in that picture...[/b]
Good idea,it is always possible....but that would not be pressurized oil as he seemed to be describing.
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Old 02-24-2009, 12:56 PM   #8 (permalink)
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None of the gasketed areas of your motor (valve covers, timing cover, oil pan, etc) see pressurized oil... except maybe the top of the oil filter.

You have a timing chain whizzing by that particular seal though, so there's probably a fair amount of oil getting slung around in there. In that pic you can also see the ports (with oil still puddled in them) where the timing chain tensioner bolts up... it DOES get fed pressurized oil.
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Old 02-24-2009, 12:57 PM   #9 (permalink)
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QUOTE (jrsy91gmc @ Feb 24 2009, 11:56 AM)
Quote:
None of the gasketed areas of your motor (valve covers, timing cover, oil pan, etc) see pressurized oil... except maybe the top of the oil filter.

You have a timing chain whizzing by that particular seal though, so there's probably a fair amount of oil getting slung around in there. In that pic you can also see the ports (with oil still puddled in them) where the timing chain tensioner bolts up... it DOES get fed pressurized oil.[/b]
Very true
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Old 02-24-2009, 05:23 PM   #10 (permalink)
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I think i may have found the cause. Looks like the valve cover gasket may need replacing. Here are some pic's.

This area was somewhat wiped clean last week during the oil change.
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Oil Leak 3.0 V6-img_5109.jpg   Oil Leak 3.0 V6-img_5110.jpg   Oil Leak 3.0 V6-img_5111.jpg   Oil Leak 3.0 V6-img_5132.jpg   Oil Leak 3.0 V6-img_5133.jpg  

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