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Old 03-06-2022, 08:50 PM #1
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V6 Oil Leak Near Timing Cover. Identification help please!

Hello Everyone,

I discovered a small oil leak on the right side of my engine. I originally thought it was the timing cover but it doesnít seem to be originating from there.

It seems to be coming from where a bolt would go but I canít find any information on what this spot is for or if a bolt is supposed to go there in the first place.

Does anyone know any information on this issue? Iíve marked the spot in red below.







Background info:
2008 4Runner V6 engine with 123,000 miles. No major work has been done on the engine that I know of.


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Old 03-06-2022, 10:03 PM #2
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theirs a post timing chain cover, i couple of us have gone through it in the last couple months. its known for leaking at that spot. not a fun task to take care of, if your doing it yourself.
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Old 03-08-2022, 01:34 PM #3
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After cleaning the area and re-inspecting Iím still not sure where the leak is coming from. Looks like it could be a leak between the block/header or at the timing cover. Part of me still thinks it coming from the mystery circle knob on the header which I havenít been able to identify. The oil control valve is right above it but I donít think thatís related.

Now that the area is cleaned Iíll monitor it to see if I can pin point the leak.




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Old 03-08-2022, 08:31 PM #4
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Thats the exact spot known for causing a leak. mating surfaces connect right there from the head to the engine, as well as from the timing cover. So theirs certain spots in there that need a little extra sealant. Seems common around 120k+ miles that its showing up, from other threads i've read and the mileage comparison they have. Not a hard job as almost everything is easy access, but just time consuming as you have to move all the components out of the way. P/S pump, a/c condensor, fan, oil housing, etc.
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Old 03-09-2022, 01:30 PM #5
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I'm no expert but I believe that is some sort of case vent. It looks like oil blowby from excess pressure or something you would see around your PCV and not an actual leak. I would have to assume that is normal/expected as there is visual evidence around my 08 V6 as well.
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Old 11-18-2022, 11:17 AM #6
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Yup thats a timing cover leak common on all 2GR V6 Toyota engines.
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Old 01-20-2023, 12:55 AM #7
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any updates on this? i noticed the same on mines tonight.
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Old 01-20-2023, 01:12 PM #8
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Itís leaking from your timing cover, thatís the most common spot on our engines to leak. Have to pull everything off the front, alternator, fan, etc., valve covers, and a lot of the intake has to be taken out. Itís not a hard job just a pita with all the shit you have to take off.
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