Leaking... again...

Discussion in 'Chevy Tahoe Forum (GMC Yukon, Cadillac Escalade)' started by Conlan Rose, Sep 27, 2012.

  1. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    So after driving home from school I did my normal routine of parking on the street, but the song I was listening to was one of my favorites so I left the truck there idling and waited for the song to finish and rolled up my windows and normal stuff before getting out. Once I got out I was welcomed to the sad, familiar smell of oil burning on my exhaust crossover pipe.

    I haven't had this smell for about 2 months since I replaced my oil filter adapter gaskets. It some times feels like once one thing is fixed with this truck another hidden problem comes up.

    Ok, the main thing for me isn't the oil leak unless I find its major, will have to check that this weekend. I can live with a slight leak, oil is cheap, but the exhaust pipe that is being rusted and damaged by this leak is not cheap. This is because I have dual exhaust from the engine not the single like most trucks, so my crossover pipe isn't easy to find. I'm going to rig up a kinda heat shield, just was wondering what the best idea for one is. My idea is use two u-bolts and a piece of thin sheet metal to protect that area.

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    Last edited: Sep 27, 2012
  2. tbplus10

    tbplus10 Epic Member Staff Member 5+ Years 5000 Posts Platinum Contributor

    It's probably just me but from looking at your picture I'd say your leak is the back edge of the oilpan gasket or the rear crank shaft seal.
    Oil corroding the pipe? Cant say that I've ever seen oil corrode exhaust pipes, you sure it isnt burned oil leaving deposits on the pipe?
  3. Pikey

    Pikey Moderator Staff Member 5+ Years ROTM Winner 5000 Posts

    I agree. Oil will not rust the pipe. It looks like the leak in further up on the pan. Why is the driveshaft covered in oil? Just fix the leak, don't put a bandaid on it. The oil pan gasket is easy to change. If you have an afternoon and some help, slide the trans back and replace the rear main while you are at it.
  4. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    Sorry for taking so long to respond back I'm not getting email notifications. Yah it most likely is the pan but it's a pain to remove because you need to get the front diff out of the way to drop the pan and to replace the rear seals you need to move tranny which will be a pain most likely. Stinks no one on the site lives by me to help out and my friends are idiots.

    Btw I'm not sure why the front drive shaft is coated in oil, yes when I change the oil is flows on to the u-joint but thats it and I havn't done an oil change since august. What's on the pipe is burnt oil but I just dont like oil burning on the pipe. Also around the pipe where its burned it looks like the coating is worn away, but this is hard to tell with out getting under the truck.

    Also the shield could be fabrocated so it shields from heat not just random leaks.

    Here an old post from under the truck it does seem that oil is being sprayed all over or was at one point.
    Note: notice the oil/grime on the starter, tranny cooler lines and wires.
    Last edited: Sep 30, 2012
  5. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    The leak is getting worse after a longer highway trip this weekend. Its now almost a small stream of oil this cant be good..... Just wondering whats the easiest way to replace the gaskets or at least a temp fix to get through the week until sunday when I have time to fix it.
  6. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    Is it possible to remove the lower transmission bell housing to more easily see where the leak is coming from. Also I really would like advice on the how to do it, because even though my repair manual tells me how theres minimal pictures and isn't from a person explaining possible problems.
  7. Pikey

    Pikey Moderator Staff Member 5+ Years ROTM Winner 5000 Posts

    that should be an inspection plate. It should come off easily.
  8. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    Ok I will open that up later this week just to see what I'm up against will post pics then.
  9. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    Will be checking under that panel this afternoon to see how bad it is leaking and where. Most likely if its the oil pan I will still replace both. Replacement will happen sunday, I may need some insight on removal I know the basics having to remove the front differential to remove the pan and move the transmission to get to the rear main seal, but what else do I need to know.
  10. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    Heres the pics of the visual inspection theres none from after the transmission inspection cover was moved because i was too frustrated and forgot to take the pics.

    After cleaning up I checked my oil level and it wasn't even on the add line, so added a quart still the same. Will add another quart in the morning.

    Tahoe barely fits in the garage and I really would like to put the front on jack stands, but I don't know if it will fit.

    The leak is getting worse and making a major mess.


    Clearest pic of this view.

    The oil filter adapter that was leaking and stopped leaking when gaskets were replaced.

    Sludge and oil coming from under the cover.

    More pics of the same.

    The sludge is every where.

    Theres oil all over the U-joint and I'm not sure why.

    Ok what just killed my progess and made a half hour project over two hours was this transmission support bolt and the one on the other end which both were/still are torqued to the max. I couldn't get this one off at all its too hard to get at and torqued, but if I can't get this bolt at least lose then doing the repair will be impossible. I was unable to remove the cover because I couldn't move the support.

    Attached Files:

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