Whine/Buzz coming from Engine?

Hi Ken, thanks for the reply. I do not have a video of the sound. However it sounds just like this video at the 2:30 mark https://www.youtube.com/watch?v=2EuXLIskQtY

I do have the oil pump and all timing gears out. Here is a link to a google drive with photos and videos of the pump, tensioner, chain, crank sprocket and actuator. I found no wear on the crank sprocket spline or oil pump spline receiver that I could detect with a fingernail. There is a video "crank sprocket to oil pump rotor 2" which shows the fit between two two parts. I would guess a machinist would say "sliding clearance fit" about 1 thou over.

For the various pump wear marks, I could not catch my fingernail on any of them. The wear in the picture "oil pump pressure adjust spring" is interesting to note. I could not find any broken parts in the pump.

Here is the link to all the pics and videos: https://drive.google.com/drive/folders/1ziIZ0si_uYwt1Vn9obM7NbBE-gamIoCR

https://drive.google.com/drive/folders/1ziIZ0si_uYwt1Vn9obM7NbBE-gamIoCR?usp=drive_link

Also there are two videos showing the timing chain slack on the actuator and crank sprockets. "actuator chain slack" and "crank sprocket chain slack 2"

The pictures "timing chain wear" and "timing chain wear 2" show some wear on one side of the chain that corresponds to the guide of the tensioner "tensioner guide"

Hi Ken, thanks for the reply.

I do not have a video of the sound, as the engine is apart now. However, it sounds like this video "buzz sound" at the 2:30 mark. Note, this is not my vehicle, and I do not have this code.

Here is a link to a google drive with photos and videos of the pump, tensioner, chain, crank sprocket and actuator. I found no wear on the crank sprocket spline or oil pump spline receiver that I could detect with a fingernail. There is a video "crank sprocket to oil pump rotor 2" which shows the fit between two parts. I would guess a machinist would say "sliding clearance fit" about 1 thou over.

For the various pump wear marks, I could not catch my fingernail on any of them. The wear in the picture "oil pump pressure adjust spring" is interesting to note.

Also, there are two videos showing the timing chain slack on the actuator and crank sprockets. "Actuator chain slack" and "crank sprocket chain slack 2"

The pictures "timing chain wear" and "timing chain wear 2" show some wear on one side of the chain that corresponds to the guide of the tensioner "tensioner guide".

Here is the video of the buzz sound. Not mine but sounds just like this. From 2:10-2:50

Picture of timing chain wear.

Crank sprocket to oil pump rotor fitment.

The oil pump.

Video showing chain slack on actuator.

I did not see any broken parts in the pump. Anything special I should look for?

Okay, thanks Ken!

Hi Ken,

I am just installing a new timing chain and want to ensure I have it aligned correctly between cam and crank. The center hole on the tensioner is offset, so it is confusing me a little, and I would like a second opinion.

See video showing the alignment.

Hi Ken, I got the oil pump primed and installed. Installed timing cover, oil pan, vacuum pump and starter installed. Paid very special attention to the oil pan gaskets to make sure I did not knock them out during install.

Since there is no oil priming port on these Gen Vs (vacuum pump now covers it), I primed the engine by running flood clear mode. I attached an OTC manual pressure gauge to the engine and ran flood-clear for about 60 seconds until pressure showed on the gauge (around 20-30psi).

I then started the engine. Oil pressure is pretty darn high 70psi at idle cold. 0-20W oil, ambient temperature is about 40degF.

Previous oil pressure at idle was about 56psi cold same wight oil. Do you think the pressure will come down after the pump breaks in?

Hi Ken, I replaced the oil pressure solenoid along with the timing chain, and lower gear. I cleaned up the oil pan and timing cover area very well, so hopefully it was not clogged from anything there. Could the valve lifter oil filter screen, near the oil pressure sender at the top front of the engine potentially cause this? I did not replace it (yet).

Hi Ken, it is a genuine GM OEM pump replacement, which is 2 stage. I did not install any kind of an upgraded pump. It is cold here, which can contribute to the high pressure. I have not yet run a full warm up cycle.

Since I don't have all the cooling system connected I did just a couple of short runs of the engine at idle. Unfortunately, the fans kick on full blast because the PCM detects a cooling system issue, so it is hard to tell if the noise is gone. I am slowly putting it all back together this week and will soon know.