I was minding my own business just going to do a simple oil change, and when I pulled my skid plate I saw a big nasty black patch of oil around the engine/transmission interface. At first I thought it was the rear main seal, but after i gut further under the car I realized the whole back side of the motor was wet. I wasn't able to pinpoint exactly where the origin was, but it looked high, at least higher than the exhaust header bolts. I also noticed oil accumulated on the bottom of my intake tube, where it interfaces with the throttle valve (again, high and at the back of the motor). The leaking intake boot seems very weird to me, because I don't think there is any oil going to that particular area, right? I've heard that the valve cover gasket can sometimes leak, though I checked all the bolts and they seem tight. I did pull the valve cover a few months ago to check the cams, so the timing might be right for the valve cover gasket maybe not being reinstalled correctly. Any thoughts?
spacediesel
What causes the intake hoses to seep oil? I was planning on cleaning out/replacing my intake anyway, maybe now is the time to do it. Does a Black RTV gasket work well for the valve cover? I've heard those gaskets cannot be purchased on their own.
they should not leak...
id look at vac/tandum pump and replace its gasket if alot of oil.. then vc gasket... but those gaskets fail and make things pretty messy..
id look at vac/tandum pump and replace its gasket if alot of oil.. then vc gasket... but those gaskets fail and make things pretty messy..
Are there oil lines running to the intake for some reason, or is it the accumulation of EGR residue (or something along those lines) that causes them to leak oil?
beather off vc fill pipes with oil vapor... this makes oil residue at boost leaks... boost leaks bad...
ok ill type for a stupid person
the valvecover breather goes to the intake boot...
the breather is full of oil vapor
this oil vapor finds holes when you have a boost leak
this in turn makes it wet with oil...
so if a intake joint is wet with oil... it is a boost leak
a boost leak is bad as the turbo overspools and fries the oil ring
this then makes the turbo cause a runaway
if you do not get that... take to a mechanic as you should not be under the hood of car
the valvecover breather goes to the intake boot...
the breather is full of oil vapor
this oil vapor finds holes when you have a boost leak
this in turn makes it wet with oil...
so if a intake joint is wet with oil... it is a boost leak
a boost leak is bad as the turbo overspools and fries the oil ring
this then makes the turbo cause a runaway
if you do not get that... take to a mechanic as you should not be under the hood of car
I removed the valve cover and painted RTV on both sides of the gasket yesterday. Torqued just beyond hand tight. Hopefully that helps eliminate the potential sealing problem. My intake sure is full of nasty shit though. I think I'm gonna need to remove and clean it a lot sooner than I thought. I see that Kerma sells a "dog collar" clamp for the intake boot to help with sealing. Do any of you recommend this part?
You're doing better than me, the valve cover is the one thing I still haven't got round to yet lol.
Phew, okay status update. I was driving home a few days ago and noticed a distinctive hissing noise from the engine bay. It was a smooth and not too loud noise, independent of engine rpm, and seemed proportional to load on the engine and how much throttle I was giving it. Seems pretty clear that it's a boost leak. So, now I have hissing/boost leak and oil from intake tract, so I decided to pull my intake off the car to inspect and repair it. I now have the entire intake tract off the car (including the intake manifold, not including the turbo). Unfortunately, I did not perform a boost leak test before I disassembled the intake.
I found oil residue (a few drops worth) in all the intake plumbing downstream of the turbo. The intake manifold is extremely clogged with soot, and there seems to be an accumulation of oily residue at the gasket which joins the upper and lower portions of the manifold together (lower portion being the 90deg bend part that directly connects to the engine). The EGR valve is also very caked up. There was also oil leaking from interface of intake tube to EGR valve.
So, I have a couple of questions and ideas. First, since everything downstream of the turbo is oily, it seems logical that the turbo is the source of the oil. I have read that a little oil is normal, and I definitely wouldn't say that oil was pouring out of the intake tubes, again only a few drops out of each end of each tube I removed. So first question is how much oil is okay in the intake? Next question is about the boost leak. I am inclined to think that any boost leak would come from an interface between two intake pipes. Is there a way to replace or refresh these joints, or is it better to simply replace the intake tract with aftermarket parts? Is there a particular juncture that is prone to leaking? I've seen the dog collar part for the interface with the egr valve and was thinking about getting one of those.
I still haven't definitively pinpointed the source of the oil leak. My prime candidate right now is the gasket that joins the upper and lower portions of the intake manifold. I will pull it apart, clean it and replace that gasket, and hopefully that will solve that problem. If any of you have other suggestions as to the source of the oil that would be great. I haven't yet started trying to diagnose the vacuum pump or tandem pump as the source of the leak.
Wow that turned into a long one but hopefully the solution is more straightforward. Thanks!
I found oil residue (a few drops worth) in all the intake plumbing downstream of the turbo. The intake manifold is extremely clogged with soot, and there seems to be an accumulation of oily residue at the gasket which joins the upper and lower portions of the manifold together (lower portion being the 90deg bend part that directly connects to the engine). The EGR valve is also very caked up. There was also oil leaking from interface of intake tube to EGR valve.
So, I have a couple of questions and ideas. First, since everything downstream of the turbo is oily, it seems logical that the turbo is the source of the oil. I have read that a little oil is normal, and I definitely wouldn't say that oil was pouring out of the intake tubes, again only a few drops out of each end of each tube I removed. So first question is how much oil is okay in the intake? Next question is about the boost leak. I am inclined to think that any boost leak would come from an interface between two intake pipes. Is there a way to replace or refresh these joints, or is it better to simply replace the intake tract with aftermarket parts? Is there a particular juncture that is prone to leaking? I've seen the dog collar part for the interface with the egr valve and was thinking about getting one of those.
I still haven't definitively pinpointed the source of the oil leak. My prime candidate right now is the gasket that joins the upper and lower portions of the intake manifold. I will pull it apart, clean it and replace that gasket, and hopefully that will solve that problem. If any of you have other suggestions as to the source of the oil that would be great. I haven't yet started trying to diagnose the vacuum pump or tandem pump as the source of the leak.
Wow that turned into a long one but hopefully the solution is more straightforward. Thanks!
The oil is normal, it usually comes from the ccv into the air intake and from there of course goes through the turbo which then blows it all through the pipe work. A good indication of to much is often the oil level dropping a bit quicker than usual.
Depending on the connections, you can buy new seals from the dealer, the green ones on the pipes that use clip connections. The egr normally has an o ring where it connects to the manifold but I'm not familiar with the BEW so can't confirm yours would be the same.
I'll need to check out this two piece intake manifold
Depending on the connections, you can buy new seals from the dealer, the green ones on the pipes that use clip connections. The egr normally has an o ring where it connects to the manifold but I'm not familiar with the BEW so can't confirm yours would be the same.
I'll need to check out this two piece intake manifold
That looks kinda similar to the newer PD100 manifolds of some of our mk5's etc but without the join, does it need to split to get it out?
Most of our tdi's didn't have egr coolers so maybe there's more room or something.
Most of our tdi's didn't have egr coolers so maybe there's more room or something.
No it came out in one piece. I just split it to clean it out, and I have a new gasket coming for reinstallation.
Update: To summarize the work I did, I ended up removing all intake pieces from the airbox to the manifold, cleaned all of them, put new gaskets where applicable, and then reinstalled all the components with RTV at all the hose junctions to improve sealing, as well as a Kerma Dog Collar for grins. This has definitely eliminated any hissing/leaking noise, and I no longer see any oil coming from any of the hose connections. Power and throttle response are also slightly improved, most likely due to the clean intake manifold. So overall success considering I only spent $100 on new gaskets and parts. However, there is still oil coming from the top rear of the motor, only now it's very localized to the driver's side-most piston area. It looks like it may be coming from the exhaust header gasket on that piston, so I'm thinking I may do a similar remove/clean/reinstall to the exhaust tract. Is this a reasonable course of action?
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