M42 running VERY loud (video), low oil pressure light is on

[Vivek]

How would I visually check the top end for oil, pull the valve cover? Or should I be able to see it though the oil cap hole? Sorry for all the questions, this is my first time swapping an engine so I'm a total noob when it comes to this stuff.

[Vivek]

Oil pick up as in under (or above I guess) the upper oil pan? I didn't touch that. I put the tensioner in uncompressed/extended.

[roguetoaster]

Did you replace the gasket on the oil pickup tube? Was the tensioner installed extended or compressed?

You could visually check to see if the top end is getting oil.

[Vivek]

Sounds like he chain tensioner isn't working. Do you have an oil pressure tester? Made sure you didn't block any passages when you replaced the gaskets?

I don't believe I did. I was cafeul on the upper oil pan gasket. The oil filter housing I didn't put any extra care into but I did it on a stand so my feeling is that I didn't mess it up. It would be leaking if the gasket was pinched or moved, right? Ill check that out, I'm not home right now.

Did you check out / replace the oil pressure check valve that lives in the timing case? Parts 5-8.
http://www.realoem.com/bmw/showparts...04&hg=11&fg=30

If that is missing or seized, that would cause your issues. The original part was superseded with a different design because the original one would get stuck open.

It was off a car that ran fine, but the timing chain had just started to make noise. Could that have been the issue? It was driven for a couple days after it started to make the noise. Cam gears literally look brand new (ill upload a pic). Cold compression was above 180psi on all four. But the engine sat dry for a few months. Does this sound like the valve could have failed, and is it hard to replace?

[bmwman91]

Did you check out / replace the oil pressure check valve that lives in the timing case? Parts 5-8.
http://www.realoem.com/bmw/showparts...04&hg=11&fg=30

If that is missing or seized, that would cause your issues. The original part was superseded with a different design because the original one would get stuck open.

[kwill22]

Sounds like he chain tensioner isn't working. Do you have an oil pressure tester? Made sure you didn't block any passages when you replaced the gaskets?

[Vivek]

So I overheated my old engine and replaced it with a newer m42. I did an m20 flywheel/clutch swap, most gaskets (upper/lower oil pan, upper/lower intake, oil filter housing and O ring, valve cover) except the head and profile. I checked all the upper pan bolts and they're good and tight. I replaced the timing chain tensioner because the timing chain had just started to make noise (got the engine from a good friend). Cam gears look brand new. Didn't touch the guides.

So here's my problem. I start it up and it idles fine but I've run it for less than a minute total because it's loud as hell and I don't want to risk damaging anything in this engine that I've put so much work into. I hope the link below works, it's loud as fuck. My oil pressure light comes on and stays on. My guess is that the chain tensioner isn't getting oil so it isn't adequately tensioning the chain. A couple of the plug wires (3&4) weren't fully connected but that made no difference once I fixed it. Any help would be greatly appreciated
Vivek

http://youtu.be/CuXx-4TR_0g