Stubborn oil leak
#1
Stubborn oil leak
I have a 2006 350z with 68k miles. It had a small oil leak I have been trying to fix. I started with new factory valve covers and gaskets. Then I replaced the rubber gasket under the oil filter. I have cleaned the engine every time and yes they all needed to be repaired .... But now I still have a leak on the passenger side .. Top above valve covers ... It's driving me nuts!!!! Any tips or clues to steer me in the right direction?
Last edited by Hotlaprc; 05-08-2015 at 08:39 AM.
#2
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Use brakeclean and get the area totally oil free. Wait for the leak to come back, and voila you will have narrowed the source.
Ultimately its going to be your eyes that will confirm the leak source, so use them. Report back either with more description around where the leak is coming from or pictures.
Ultimately its going to be your eyes that will confirm the leak source, so use them. Report back either with more description around where the leak is coming from or pictures.
#3
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Guitman has the right advice- we can't help what we can't observe. But two questions on a Z with not too much mileage: 1) why did you replace the valve covers and gaskets in the first place? #2) What rubber gasket on the oil filter housing are you talking about?
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if the leak is coming from above the passenger valve cover, i assume you guess this because the oil is collecting on the valve cover itself?
if thats the case, only thing i can think of above the valve covers that has oil would be the intake, since oil collects in the valleys at the bottom. but that would mean a vacuum leak too which should be noticeable.
check the pcv valve and hose too since its also on top of the passenger valve cover and runs to the front passenger side of the lower intake plenum.
if thats the case, only thing i can think of above the valve covers that has oil would be the intake, since oil collects in the valleys at the bottom. but that would mean a vacuum leak too which should be noticeable.
check the pcv valve and hose too since its also on top of the passenger valve cover and runs to the front passenger side of the lower intake plenum.
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also if your spark plug tube had oil in it.
its possible thats still leaking, since if i remember correctly you cant buy the spark plug tube seals which are apart of the valve cover itself.
its possible thats still leaking, since if i remember correctly you cant buy the spark plug tube seals which are apart of the valve cover itself.
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#8
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He said he replaced with new OEM valve covers, so his plug seals are new.
The OP just needs to describe exactly where on the "the passenger side .. Top above valve covers" the leak is showing up. From that statement I would assume the actual leak is coming from above the valve covers (intake manifold, plenum area). But the description is so vague he leaves us guessing.
Is the oil leak showing on the valve cover itself (if so where exactly on the cover)? Or is the oil leak coming from the gasket between the upper and lower plenum? If so, it is pretty common to see blowby from that area which will look like a dirty oil leak.
The OP just needs to describe exactly where on the "the passenger side .. Top above valve covers" the leak is showing up. From that statement I would assume the actual leak is coming from above the valve covers (intake manifold, plenum area). But the description is so vague he leaves us guessing.
Is the oil leak showing on the valve cover itself (if so where exactly on the cover)? Or is the oil leak coming from the gasket between the upper and lower plenum? If so, it is pretty common to see blowby from that area which will look like a dirty oil leak.
#13
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Nice work on the pics. That is a lot of oil.
Take the engine cover off, clean the area and see where it starts seeping from first. Definitely looks like it could still be the gasket you replaced. Did you use an in/lbs torque wrench on those bolts?
BTW that part is officially called the "intake valve timing control solenoid valve."
Take the engine cover off, clean the area and see where it starts seeping from first. Definitely looks like it could still be the gasket you replaced. Did you use an in/lbs torque wrench on those bolts?
BTW that part is officially called the "intake valve timing control solenoid valve."
#14
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I too have an oil leak which i thought was from valve covers.
Replaced mine but did not solve it.
Maybe this in antiquated technology....but isn't there an additive that one can add to the oil, then use a black light to locate leak?
Maybe that was for coolant or something?
Replaced mine but did not solve it.
Maybe this in antiquated technology....but isn't there an additive that one can add to the oil, then use a black light to locate leak?
Maybe that was for coolant or something?
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