m20b27 valve adjustment

[timninja]

I know there are a few right-ups on valve adjustments but I have a few more questions I can't find answers too.

So 1st,do i adjust the b27 valves any different then the b25?
2ndly how tight do i want the gap between my rocker and cam lobe?
last question,where in the cam lobe is best to tighten my rocker down?
Thank you for you patience
P.s. I dont think they're called rockers but oh well

[jlevie]

The valve adjustment is the same on both engines (0.010" cold).

Tighten the eccentric until there is a noticeable drag on the feeler gauge.

Adjust the valves on a cylinder when both cam lobes are pointing down.

[timninja]

Both cams
?

[jlevie]

Your M20B27 engine only has one cam.

[timninja]

i ment to say "both cam lobes?"
i didnt know two cam lobes faced down,ill figure it out tonight when i look under my valve cover,thanks for all your help.
so for future searchers;
22mm wrench on my crank shaft bolt
motor turns clock wise
snug my feeler gauge between lobe
annddd dont leave the drivetrain in gear;)

[ÜberslowETA]

Just make sure that whatever rocker you are adjusting has a closed valve. It will be easy to tell as you rotate the crank.

[5Toes]

Try to adjust to .012" cold (.3mm). Its how they do it in Germany

[Cronopoulos]

Try to adjust to .012" cold (.3mm). Its how they do it in Germany

That makes more noise. Did you mean to say .012 "hot"

[5Toes]

No cold. Trnaslated form e30.de

Valve adjustment DIY, courtesy of E30.de. I cleaned up the translation a bit

"Ventilspiel einstellen - am M30, M10 und M20" is the title of the article, second from bottom under "motorraum" section of DIY

Valve clearance:

The engine should be cool enough, it is best if it is left over night. First, the 735i has the airbox over the valve cover,and this needs disassembled. After the 9 nuts are loosened you can remove the valve cover.

Any cylinder cam overlap bring:

With a B34 crankshaft flywheel nut on the car or move (with pickled 4th gear) you can now talk to the camshaft via a slow rotation. Here you should watch the rocker arms each cylinder and check for that cylinder, which are currently on cam overlap. The cams are then quite symmetrical up to a few millimeters, it does not matter here. By further moving the car or turning the crankshaft, each cylinder can thus bring to overlap.

Calculation:

By a simple calculation, we now determine which cylinder can be adjusted. This is not the fact of overlap, but the resulting as a result of the following simple calculation:

(7) minus (overlapping cylinders) = (variable cylinder)

So when the first cylinder just overlap, then you can set the sixth cylinder.

Feeler gauge to use:

Between the eccentric rocker arm and valve stem tip of a probe is now inserted empty, and thus checked the distance. In the first photo I have the range of the valve clearance times enlarged.

*Valve clearance

*Use of the sensor void

The real skill lies, to develop a feeling for the resistance, which produces the sensor void when pulled. Can it be introduced by pulling hard and then the game is much less than the face value. Fairly certain if the distance is now offering the following method:

Predetermined value for M30 valve clearance is 0.30 mm

void with a probe 0.30 mm insert
Excenterhaltemutter me loose 10 key ring
Twist eccentric with small nail or Allen, so that the eccentric presses against the sheet
Now back to shoot a very small hint, so that the blade loosens slightly
Excenterhaltemutter tighten
the 0.30 mm probe must be empty now can pass through relatively easily and without much effort
then used to control a probe with 0.35 mm void
they can pull themselves only with increased effort
Eccentric screw final
Was to check with the 0.35 mm sheet successfully, then the valve clearance is correct to 0.30 mm. The following errors are possible:
1.The vacuum sensor with 0.35 mm can introduce themselves and not at all more pull - then the 0.30 mm to tightly set, so again the procedure from the beginning.

Second The sensor void with 0.35 mm can be introduced relatively easily, only 0.40 mm is a little harder - it was the 0.30 mm play too loose.

The main skill is targeted is the rotation of the eccentric. Here you can, as described, the eccentric press against the gauge and take it back a little hint. This is actually quite good for beginners. Also possible is also pushing the eccentric from the beginning to very lightly against the paper, but really only very slightly, then results in a similar pressure. No matter how you do it, is crucial only the result, the control with the next larger probe emptiness that can only fit with a little effort. I do not mean brute force, because then fits down every probe void, because the valve can be so easily shift to the bottom.

Another tip: The Excenterhaltemutter should not be relaxed too far. Has proven to loosen only partial, then the eccentric is still somewhat compressed and simplified the specific rotation. Then the eccentric twist not by itself when the retaining nut tightening.

The values are:

On M20 (320i, 323i, 325e, 325i), it has proven itself valve lash against the BMW with (0.25 mm) to adjust a little looser. i.e. 0.30 mm inlet-and outlet. This provides a more stable idle (especially at 320i) and a little ambitious in fuel mileage. The clickers of the valves is thus hardly noticeable louder, the measure is worthwhile in any case.

When M30 (528i, 535i, 735i, 635CSi, 530i, 730i), I have found several indications. Nearly all the repair manuals recommend 0.30 mm-inlet and outlet. The new repair manual for the 730i/735i/750i is 0.30 mm and 0.35 mm inlet-outlet side. So I've set for my 735i inlet and outlet sides loose 0.30 normal 0.35. As Ingo Köth told me, ALPINA has set for the M30 engine and the inlet side 0.35 mm and it has thus set a little more power (on the engine test bench).

The operation of this small improvement by larger valve clearance can be explained as follows: The rocker arm valve meets a little later but much more abrupt, as when the rocker shape of the cam would be followed without a jerk. This abrupt shift in the valve movement causes entrainment of the air column and leads to a small dahrer charging effect.

If you found it all too adventurous, no problem, you must try the not so. The entire community goes around Berlin www.e30.de with this setting and can only say positive. If you rumärgert you with sägendem idle, then you should definitely try this.

And in conclusion: too much clearance is significantly less dangerous than too small. The wear on the camshaft takes theoretically to something. Valve clearance is too small dense but the valves do not work properly from the exhaust valves and can overheat, because they are no longer enough rest in the valve seats. Possible consequence: valve outline.

[timninja]

I'm being a huge waffleswaffleswaffleswaffleswaffles.so im adjusting my exhaust valves 1st and when I have the feeler gauge in should I make that rocker arm pretty tight on it then after I pull it out have little to no play?I really don't want to wipe my cam lobes,

[Cronopoulos]

I'm being a huge waffleswaffleswaffleswaffleswaffles.so im adjusting my exhaust valves 1st and when I have the feeler gauge in should I make that rocker arm pretty tight on it then after I pull it out have little to no play?I really don't want to wipe my cam lobes,

Make sure not to apply any force to the rocker arm when making the adjustment. The feeler gauge should "gently grab" against the eccentric and the top of the valve, i usually put a little oil on the feeler gauge as well to get a consistent and accurate measurement on each one.

[timninja]

Wait!?.012!? I just set them all to .010

[5Toes]

Read the poorly translated article.. them germans explain why .012 is better. They know best...

[timninja]

and then when im done should there be enough room between the eccentric rocker arm and the cam lobe for me to hear a tick when I rock it or am I causing self inflicted valve tic lol?

[jlevie]

If you turn the engine until both cam lobes are down the intake and exhaust valves on that cylinder and be adjusted.

0.012" is the hot setting (engine at or above 140F) of the valves. The cold setting, per the TIS is 0.010".

The best way of adjusting valves, that removes any subjective judgement, is to use the BMW spring tool or it's equal. With the tool you loosen the eccentric, insert the feeler, use the spring tool to rotate the eccentric until there is a 45deg or more bend in the spring, and then lock down the eccentric. BavAuto and other places have the tool.