Help !!!! Hammering sound in my Engine M30!!

[winfred]

if you can't find anything with the valve cover off there may be bottom end dammage like a spun bearing, you can drain and strain the oil looking for copper/silver looking flakes, that would mean a bad bearing

by the way, the engine still runs as smooth as before ... smooth idle ... "with the sound!!"

[grave77]

synthatic oil 10,000 Km still 8,000 Km left ...

[Paul in NZ]

synthatic oil 10,000 Km still 8,000 Km left .

not now my friend

ouch sorry about that

a standard m30 goes flat as a pancake at just over 6200 when the rpm limiter cuts in...prolly just before valve bounce,as i found once passing a dude on a short uphill passing lane

[grave77]

Well ... I feel like I will replace the engine ... removing the head will cost 80% of installing a good condition second hand engine. therefore I will run the engine untill it dies maybe I will learn from it more than wasting time fixing it ... do u agree guys?

[632 Regal]

maybe you just bent a couple valves and its hammering into the guides??? heavy metal sound isnt good none the less. maybe with a lot of good luckits something stupid??? naww its trashesd, I would however like to see you start takin it apart finding whats wrong before replacing the deal. Never know man.

[Paul in NZ]

problem with a usedengine is just that...how "used" is it,i would fix the one you have got,my bet is a top end problem.....

[Rory535i]

problem with a usedengine is just that...how "used" is it,i would fix the one you have got,my bet is a top end problem.....

I broke a rocker arm on my M30 and it made a similar noise but I also had a considerable loss of power as the exhaust valve wouldn't open on that cylinder. I still managed to drive it 20 miles back home and I was quite suprised how well it ran on 5 cylinders! They're great engines. My original cam and rockers saw close to 150,000 miles before it gave up. When i took the head off i was pleasantly suprised to find out that it had been given a bottom end rebuild quite recently because I could still see the hone marks in the cylinder bore. Now with the new cam i now that i have a bomb-proof engine for another 100,000miles!

[Derek A.]

You might want to try and hook up a mechanical oil pressure gauge on the motor and see what kind of pressure you are getting. m30 is usually about 80psi cold with 15w50 oil in it. If you see a huge drop or the gauge is bouncing all over the place, chances are you hurt something on the bottom end.

First things first - pull the valve cover and watch the rockers arms as the engine is cranked - make sure that evertything there is in good shape.

[grave77]

well now I have a clear idea about what to do ...I'm going today to the mechanic to see whats going on... I will take pictures to keep in Bimmer archive. I will also change the head screws to Trox instead of Hex type before summer time. Hex screws r a timed Bomb !! by the way I drove her today around a 130 miles ... with speed 125m/h still running smooth ... this M30 engine is a Tank engine ... wish me luck guys ...

[winfred]

they almost never wear off the marks, i've done dozens of bmw head jobs and they all have hone marks, i did one that had 311k miles on the orignal bottom end that had most of it's hone marks

i was pleasantly suprised to find out that it had been given a bottom end rebuild quite recently because I could still see the hone marks in the cylinder bore.