phunterr1

Hi, I am having the same problem as you have had. Can you please explain where the 2 non returns valves are located on the cylinder head and also can they be removed and checked without actually removing the head cover etc as per solenoids??

Many thanks

xytras1979

There is no need to dismantle the cylhead topcover - in fact there is no need to dismantle anything. Both "check valves " are located on the leftside of the engine- viewed from front of the car . You need a no 8 torx spanner - as far as I remebered. Acces is not so easy but can be done by someone skillfull
Any way normally these valves must be check / clean at every oil change . Also I want to announce you all, that after 500 km my problem reapears - I will again proceed with an oil change + dismantling the cyl head top cover to manually cleaning the sludge - I still hope that problem comes from there. If not ... new cylhead...I will keep you inform about my work.
Good luck ! - it seems that all N52 owners need it...

balbs

I hear that there's a new cylinder head for the N52 that will make it have a better oil flow in order to reduce ticking and I guess minimize sludge. Someone may confirm this.

phunterr1

Thanks for that reply. Would you have a picture of the location at all? If I can't fix it I would like as much info as possible for my mechanic.

Many thanks

blueswede

Thanks xytras1979, tried hard to locate the valves today but failed.

Please have a look at the picture where I made a red circle, is this one of the valves?

I'd appreciate if you can indicate the other valve too in the picture (or both if I'm wrong).

phunterr1

Hi, I checked that and can confirm its not one of the check valves. Still do not have a clue where they are lol!!!

Cheers

bota

Update. Again Vanos intake:
I will try to put everything in chronological order:
1. two years ago (30kkm) I got check engine codes for vanos when both solenoids were replaced. This clear codes and the car run fine since then.
2. a month ago after 100km of dynamic driving and many WOTs, check engine light came again: 2A82 and 2A89 for intake Vanos.
3. after we switched solenoids from intake to exhaust, the code remained the same. Mechanic concluded it must be something else, normally.
4. in the same period of time, i.e. from 90kkm to 120kkm the oil consumption increased from some 1 litre on 2000 km to 1l on 600km. Mechanic guessed it might be oil separator.
5. Finally mechanic took the car for more detailed inspection. After removal of intake manifold, he noticed broken DISA adjuster unit (part code 11617579114) and replaced with used one. Also, the oil separator and the hoses were replaced (they were full of oil sludge) and all adaptations cleared from the computer. After this, mechanic suggested not to change anything in the vanos, yet.
6. Nevertheless, the codes remained together with stalling in acceleration until 3000 RPM (like before) and hiccups on idle (not so ofter before). However, oil consumption dropped (after 850km two dots on idrive).
7. Now, the mechanic suggested to replace vanos inlet adjustment unit (11367583207), timing chain and tensioner (when it is already open) and some ring on inlet camshaft (not know which part exactly).

Now, I have few questions:
-> any other idea on vanos codes (because I saw many different comments over forums, like solenoids, some rings, non-return valves, engine flushing...but I did not run on adjustment unit replacement at all)
-> is this oil consumption acceptable (oil is 5w30)
-> is it possible that idle hiccup is correlated with Vanos.

any ideas anybody?

twh

bota, what is you year and model?

bota

How I missed this

E60 N52B25 year 2005.

twh

Check out the PDF in this post:
https://5series.net/forums/e60-discu...4/#post1544295