m42 knocking

[timofeylbelarus]

so i started to go for the oil pump, taking everything off and stuff and found out that my main bearing took a dump on me and my 4th rod bearing spun, this is lame. well i guess here comes a full rebuild of my m42 lol

[bmwm42]

but if the oil pressure is low wouldn't the oil light go on?

Nope my car ticked like a muthafucker i installed new vw lifters timing was correct. imy car wouldnt tick all the time hust most of the time. Everythung was nrw except the oil pump i mean the engine had over 400k. Installed low mileage engine no more tick

[timofeylbelarus]

but if the oil pressure is low wouldn't the oil light go on?

[timofeylbelarus]

ok so i'll check the oil pressure i guess when i get the chance

[Simon S]

Ah.. understandable. Thanks for feedback.

.. with over 400k

Sweet Jesus !!

[AndrewBird]

Generally oil pumps stop working after the clearance between the lobes of the "sprocket" and the out case get too wide. they should only be a few thousandths of an inch. Any more and the pump can't compress the oil and pump it. Easy check would be to throw an oil pressure gauge on and see what the pressure is. Should be somewhere around 63 psi at higher engine speeds.

[bmwm42]

It has like one moving part. How does an oil pump fail?

It breaks or grinds down the teeth causing a drop in pressure happened to my old engine with over 400k

[Simon S]

Mine was a bad oil pump

It has like one moving part. How does an oil pump fail?

[timofeylbelarus]

crap, i really don't want to dig in this engine again

[timofeylbelarus]

no i didn't remove the rear timing case,

[bmwm42]

no i didn't replace the oil pump is it hard to do? do i have to take the timing case apart again?

You will have to remove the entire case again and depending on preference the head aswell. Though if you replaced the entire timing case you would have had to remove the oil pump and it its attached to the rear timing case.

[timofeylbelarus]

no i didn't replace the oil pump is it hard to do? do i have to take the timing case apart again?

[bmwm42]

Could be many things you mentioned you replaced the timing case, did you replace the oil pump? from the video it sounds like its the entire lifers clattering. I think its lack of pressure not really timing chain related

[timofeylbelarus]

http://www.youtube.com/watch?v=yRrg9ammDCU

here is a working link

[timofeylbelarus]

http://www.youtube.com/watch?v=a4o14VTYoG4&feature=youtu.be

here is the video of my car