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Discussion Starter · #1 ·
Hey guys just got done putting my upper oil pan on and on first start up it started leaking where the front of the pan meets the block on both sides. I'm assuming that's not normal any advice?
 

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Welcome- VQ engines are precision made and normally do not leak any oil. It would help to know why you replaced the upper oil pan in the first place, together with year and mileage of your Z. Can´t offer any advice without knowing the basics.
 

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Discussion Starter · #3 ·
Welcome- VQ engines are precision made and normally do not leak any oil. It would help to know why you replaced the upper oil pan in the first place, together with year and mileage of your Z. Can´t offer any advice without knowing the basics.
I was burning a quart of oil a week so I rebuilt the engine and on first start after that it leaked about a quarter cup in 15 minutes. It's an 03 with 109k miles on it.
 

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Thanks for the details. If you rebuilt the engine on a engine stand, there´s something clearly amiss with the front of the motor. Sorry to say, you may need to pull it again to inspect where the front of the pan and the block meet. What kind of sealant did you use to install the pan? Did you use the NIssan FSM?
 

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Discussion Starter · #5 ·
Thanks for the details. If you rebuilt the engine on a engine stand, there´s something clearly amiss with the front of the motor. Sorry to say, you may need to pull it again to inspect where the front of the pan and the block meet. What kind of sealant did you use to install the pan? Did you use the NIssan FSM?
I used prematex ultra black and I did use the Nissan FSM
 

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OK- have you verified the torque readings on the pan bolts first? If they´re on spec, I suspect something got left out with that big a leak.
 

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Discussion Starter · #7 ·
OK- have you verified the torque readings on the pan bolts first? If they´re on spec, I suspect something got left out with that big a leak.
I found the leak this morning it was coming from between the head and timing chain cover instill pulling the cover to see exactly where its coming from I'm guessing I nicked an o-ring or something.
 

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Welcome- VQ engines are precision made and normally do not leak any oil. It would help to know why you replaced the upper oil pan in the first place, together with year and mileage of your Z. Can´t offer any advice without knowing the basics.
Hello, i have a question i successfully installed my upper oil pan on my 2005 350z and i seem to have no oil pressure i did replaced the 2 oring that sit on the upper pan but I couldn’t tell you if while installing they got pinched. before install i hand oil pressure plus light and gage worked now the oil light is on and i have no pressure showing on the gage any thoughts before i start removing the upper pan ?!
 

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Hello, i have a question i successfully installed my upper oil pan on my 2005 350z and i seem to have no oil pressure i did replaced the 2 oring that sit on the upper pan but I couldn’t tell you if while installing they got pinched. before install i hand oil pressure plus light and gage worked now the oil light is on and i have no pressure showing on the gage any thoughts before i start removing the upper pan ?!
Without knowing mileage, or why you removed the upper pan, it's hard to say what to do. Maybe put the car on a trailer and take it to an experienced tech before you start undoing all you work.
 

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Hello, i have a question i successfully installed my upper oil pan on my 2005 350z and i seem to have no oil pressure i did replaced the 2 oring that sit on the upper pan but I couldn’t tell you if while installing they got pinched. before install i hand oil pressure plus light and gage worked now the oil light is on and i have no pressure showing on the gage any thoughts before i start removing the upper pan ?!
Without knowing mileage, or why you removed the upper pan, it's hard to say what to do. Maybe put the car on a trailer and take it to an experienced tech before you start undoing all you work.
I removed upper oil pan because rear main was leaking so was the front. doing all this work is no big deal just wanted to know if anyone had experience and issues if some how the orings go pinched as installing. After my work was done I explain zero oil pressure that’s just my question mileage is irrelevant the job needed to be done to oil leaks
 

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I removed upper oil pan because rear main was leaking so was the front. doing all this work is no big deal just wanted to know if anyone had experience and issues if some how the orings go pinched as installing. After my work was done I explain zero oil pressure that’s just my question mileage is irrelevant the job needed to be done to oil leaks
No, mileage is not irrelevant. If this VQ has high miles, there could be other failures at work that could help explain the readings. There's also the question of why BOTH front and rear bearings were leaking. VQ engines are precision built and leaks that large are usually due to poor maintenance or some damage to the engine itself.

But to answer your question directly, if O-rings are pinched or otherwise distorted during installation, they cannot seal properly. Whether this explains your lack of oil pressure, there's no way to know from behind a keyboard.
 
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