HR potential oil pressure problem

[JB-)]

Yep, me for one. Just ticked over 70k on a 57 plate. My pressure is up at 65-70psi on cold startup. Drops down to around 30ish within a minute of warming up and stays between 20-30 on a normal drive, rising rapidly if I boot it. In stationary traffic with a warm engine it'll be really low, just above the minimum on the guage

 

That's a lot different to mine. From a cold start it's up around 120, and once fully warm it's 60 at 2000 rpm. Mine's done 43k.

 

Something doesn't seem right there then does it.

 

With which one? Pressures from the workshop manual:

 

Idle - More than 14 psi

2000 rpm - More than 43 psi

 

 

So 20-30 normal driving doesn't sound right.

[steve916]

Yep, me for one. Just ticked over 70k on a 57 plate. My pressure is up at 65-70psi on cold startup. Drops down to around 30ish within a minute of warming up and stays between 20-30 on a normal drive, rising rapidly if I boot it. In stationary traffic with a warm engine it'll be really low, just above the minimum on the guage

 

That's a lot different to mine. From a cold start it's up around 120, and once fully warm it's 60 at 2000 rpm. Mine's done 43k.

 

Something doesn't seem right there then does it.

 

With which one? Pressures from the workshop manual:

 

Idle - More than 14 psi

2000 rpm - More than 43 psi

 

 

So 20-30 normal driving doesn't sound right.

 

Maybe both of ours. Your 120psi sounds high, and my just above minimum in stationary traffic seems low, according to the manual.

[JB-)]

Here's one thread where a few people have the same high reading from cold and say it's normal. It's from 2005 so will be for a DE but still...

 

http://www.350z-tech.com/forums/173-nissan-350z/40208-high-oil-pressure.html

[steve916]

Here's one thread where a few people have the same high reading from cold and say it's normal. It's from 2005 so will be for a DE but still...

 

http://www.350z-tech.com/forums/173-nissan-350z/40208-high-oil-pressure.html

 

It's more than likely that both of our readings are absolutely fine, but we each have different oil in our engines, therefore affecting our pressures.

 

I'm not worrying about mine. I have a P3 service due just after Christmas so when the oil has been changed, I'll see if there is any difference then.

Edited November 22, 2014 by steve916

[JB-)]

Probably yeah. It's certainly more than likely than any problem is actually with the gauge or sender rather than the engine. Just for info for the thread, I'm using 5W30

[steve916]

And also, just for the thread, I'm also using 5W30 but The car was fitted with a new sensor in the last year.

[Tricky-Ricky]

Changing oil grades wont make that big a difference, unless you test the true oil pressure with a mechanical Gauge you wont know for sure, you could have a problem with the pressure relief valve.

[steve916]

Changing oil grades wont make that big a difference, unless you test the true oil pressure with a mechanical Gauge you wont know for sure, you could have a problem with the pressure relief valve.

 

Who could have the problem, me or Joe?

[Tricky-Ricky]

Too high and too low could indicate a problem with the oil pressure relief valve, but low pressure is more of a cause for concern, as it could also indicate worn bearings or pump (unlikely).

[Roscoe]

This is the thread the information was taken from

 

http://g35driver.com/forums/g35-sedan-v36-2007-08/436179-cause-dreaded-p0011-p0021-codes-everyone-curious-about.html

[Tricky-Ricky]

Is that not the link you first posted? and like I sad after looking at the manual the pressurised oil feed for the VVTI is sealed via rubber "O" rings, and although they are referring to the HR version, I really cant see them reverting to a gasket.

[Roscoe]

It mentions the CVTC oil gallery gaskets which look like this

[Roscoe]

 

[Tricky-Ricky]

It mentions the CVTC oil gallery gaskets which look like this

 

My apologies, I didn't realise that they meant those galleries, makes no sense running normal gaskets on high pressure oil galleries,

why did Nissan not use rubber gaskets in recesses, or at the least use a sensible sealant, thats just asking for trouble, funny I have never heard of the same problem on the DE.

 

The trouble is if there is enough of a leak there to cause the oil pressure to drop that low it's more than likely that there is already damage/accelerated ware to the plain bearing shells.

[Roscoe]

I've had it in at Japex today, oil pressure was 14 on idle and 40 at 2000 rpm. It was on 60psi on the way home at about 4000rpm. They don't seem to think it's an engine problem and have never heard of these gaskets going. Especially on the HR!

[Tricky-Ricky]

I would presume the HR runs pretty much the same std oil pressure as the DE, those pressures don't seem dangerously low but the fact that you say your pressure has dropped suddenly is a bit of a worry, I would fit a reliable electric or mechanical after market oil pressure gauge and just keep an eye on it..

[Roscoe]

I dont know what to do! I would like to have a look to see if it is the gaskets that are leaking but just don't have the garage space at the moment as I've just moved house!

[jimboy2]

Is it bad that I have literally no idea what my oil pressure reads?! All I know is it's never at 0 and it's not using any oil.

Do I need to be trying to remember what pressure at what RPM it's reading?

[Bodyboarder81]

I was told if it's reading 60psi on a warm engine at 60 mph in 6th you are fine . Mine on cold start up sits just below 120 and drops as the engine warms .

[ZEUS]

My DE sits just below 60psi (about 50) at 60mph in 6th gear and has done for all the 4 plus years I've owned it without a single problem. Not sure if it's the same on a HR?

[Tricky-Ricky]

From the manual, oil pressure for the DE states that it should be more than 14psi at idle and more than 43psi at 2,000 RPM at a temp of 80c.

[Roscoe]

I am convinced now that it is the oil gallery gaskets that are allowing pressure drop! Seems to be happening on VQ35HR's from 70-120k. Let the strip down commence.

[steve916]

Well, we've had some colder mornings this week, and I've noticed that my HR has been cold starting at about 90-100 and then dropping to about 60 before I drive off. Once everything is warmed up on a drive im getting 45-50 at 2000 rpm in 6th, then about 15 at idle.

[Roscoe]

Also been found on a 370z in the states! Nissan obviously didn't upgrade the gaskets until late 2012/13 😒

[r32tone]

Hi guys, just wondered if any update on this as my 07 plate just dropped in pressure down to around 10psi at idle.. Was hoping maybe engine flush may cure problem??