strange engine sound after bottom end rebuild

Last year i changed the main bearings with acl and the rod bearings with clevite. Along with these i changed the oil pump with a new geniune one. Thats all. After that i hear a strange squeezing sound al over the engine. It starts happening at certain rpms and follows the engine revs. When the engine is cold it starts at 2k after the engine warms up it moves forward about 2.5k All these with heavy oil 15w40 that i used for a couple miles just for a firts quick change. When i used 5w30 the point where the noise appears changes upwards to 3000+ cold 3500-4000 hot.
So i run the car without aux belts, the noise is still there. Have heard all the cam belt tensioners seems ok. I have electric fans so no e-fan. Also i have tomei adjustable cam pulleys so the vvt is deleted.
After 20.000 km i had to pull out the engine due to piston crack. So checked everything again. All the bearings was good, the oil pump seems ok generally nothing strange found at all. Now that i run it again with a heavy oil the same think happens. Any ideas of what this should be? Also it makes that noise as far as i start it cold just for a couple seconds untill the pressure is up.
I ll try to record a video before i change oil because now it is loud.

 

http://youtu.be/UiJMaso1sYE

 

Your will pressure is very high. The sound sounds like it maybe the relief valve of the oil pump, or the oil pump itself. Did you check the relief valve when you did the rebuild?

 

Sounds very much like the oil pump relief valve to me

 

Thats my guess too. But i have inspected when got it out and everything looked ok. Basically i checked there for signs of worn and compared the parts with the used pump. Everything was good. I ll try to stick a stethoscope near the relief valve to see what i hear.
As for the oil press it is so high cause the car was stoped for 2 days and the time the video was captured the out temp was near 0 celcius. During the car warms up it drops near 2 and after lets say 10 min it stays just under the 4 mark

 

Well today checked it again. Changed oil and used redline 5w40 and new nissan oil filter. NOthing changed at all, the sound is still there but a little quiter. Got a sthethoscope and get it allover the engine. And as you told me the sound comes from the oil pump. Cant say if it is the valve relief or the pump itself but it sounds there. Also it sounds very loud at the oil filter too. As the oil press drops and the temp rises the noise comes quiter but still there if i rev it over 3k. What could it be? Faulty relief valve? I'll instal an aftermarket oil press gauge just to confirm the strange values i see now.

 

What strange values are you getting ?

This sounds very similar: http://www.youtube.com/watch?v=wL-MdKUImBM

Read the comments, I think he is saying it was the oil pump AND had damage to the cam belt from it.

This "Common Oil Pump Failure Symptoms" webpage says some interesting stuff also.

http://www.carsdirect.com/car-repair/common-oil-pump-failure-symptoms

 

There is also this posted as a too tight cam belt sound.

http://www.youtube.com/watch?v=vLNYqaslvPY

Maybe the cam belt being too tight could damage a oil pump the same way you can have premature water pump failure if its belt is too tight.

Maybe check belt tension and tensioner first, probably easier then changing oil pump.

But I wouldnt be flogging it could go bad quickly with a oil pump and or belt in question.

See the manual for your engine for belt deflecton details.

 

Did you use a Z32 VG30DETT pump or the Z32 NA VG30DE pump that is the same as Y31/Y32 VG30DET pump ?

Are you using stock bearing clearances or other oiling system modifications ?

 

Done this already, double checked the tensioner and the belt. Done everything as the fsm says. Checked the tensioner and it is extended as supposed 4mm.
The sound started as soon as i installed the new oil pump. Not 100 miles after the install, it started with the first start. Propably the oil pump was faulty from the factory?

I used a z32 vg30dett pump. Is there a difference between them. No oil system mods, no oil cooller the only think that i have changed is that i have removed the oil restrictor at the turbo oil feeding line as i now have a thrust bearing turbo. Stock bearing clearances.

 

The TT pump has a stiffer spring in the releif valve giving a higher oil presure at higher RPM and at cold start up idle with thicker oil.

I had a strange thought, that if you had used the TT pump on the VG30DET that higher oil pressure may cause the tensioner to over tighten and create the situation.

EDIT: Probably wishful thinking as it doesnt go away when warm does it.

I will edit this post in a moment once I have the specs out of the manual.

Manual doesnt say, 11 PSI at idle and at 3000 RPM 51-65 PSI for VG30DE/TT.

Z1 says you can just change the releif valve spring/assemblies, do you still have your old pump ?

Change it over and see what happens.

http://www.z1motorsports.com/PDFs/NATTconversion.pdf

 

But the tensioner is independent. The oil press doesnt affect it.

This is happening to me, cold the press is far too high. It goes over the 8 mark. You can see it at the video. But when it warms up it sits just under 4. The only think that concerns me is that in the meanwhille the press goes under 2 for some minutes untill it totally warms up, even if i step on it and go to the limiter the press sits there.

 

For some reason I thought our tensioner was oil pressure driven.

Sounds like you are about to change an oil pump.

Only other thing you can do is change the relief valve out from the old pump or a NA Z32 one, worth a go I think.

If you have thrown it out, just buy a Z32 NA/VG30DET oil pump, swap the valve, if it doesnt fix it, you have a pump to fit.

 

Thats an oil pump noise. Sounds like its picked up a burr from something in the oil when you first started it.

You need to pull it and inspect the pump gears. I had the same thing with a car I worked on a few years ago. Sounded almost the same.

 

It gets worst... Now i hear a rod bearing ticking when the car is cold. So i'll strip it for sure and post the results.

 

Rod bearings dont usually tick when they fail, I'm pretty sure that you will find that its a hydraulic lifter thats sticking, or check valve in oil system to heads is passing.

 

Very commom sound when there is insufficient clearance between the oil pickup and the sump creating excessive suction on the front side of the oil pump.

FJ20's are famous for it if they get a thump on the sump that pushed the pan up a little.
My old FJ did exactly the same noise.

Always worse when cold and the oil is heavier. Check your sump pan for damage.

E

 

Had a mate who thought he had a knock, turns out problems with the sump.

 

wow, sounds possible. The det engine has a different oil pickup as it has a different oil pan. The oil is been sucked from the front of the oil pan and not from behind as the dett. So it is possible that the oil pickup has a smaller diameter in det and thats why the sound started when i used the dett pump? Can someone tell me the dett's oil pickup diameter?