M20 Valve Adjustment DIY.

[2.5-12]

M20 valve adjustment.

Tools needed:
** 10mm short or deep socket
** 3+” ⅜” ratchet extension
** ⅜ ratchet
** feeler gauge ( .010” ) the angled kind are much easier to use and cost about $5
** 10mm boxed wrench for the eccentric retaining nut
** ~1mm allen wrench to adjust the eccentric.
** standard screw driver

Step 1.) we’ve gotta remove the valve cover!
there are 12 total nuts/bolts that have to be removed they are all highlighted in pink.


Step 2.) breathe!(r)
take your standard screw driver, loosen the clamp on the breather hose, and push it out of the way. (dont lose the clamp)


Step 3.) remove the plug wires and set them out of the way.


Step 4.) take the VC off.


Step 5.) find every rocker arm that isnt being currently actuated by the cam. you can do this simply by rocking the arm back and forth. if it moves, its not being actuated, and you can adjust clearance on it.
once you’ve found a suitable rocker arm, take your feeler gauge and pull out the .010” blade, slide it inbetween the rocker arm eccentric and the top of the valve.


step 6.) time to adjust it!
with the .010” blade still in place, insert your allen wrench in the small hole in the side of your eccentric. While you do that, losen the 10mm eccentric retaining nut enough where you can move the eccentric back and forth easily with the allen wrench. Once you can move it, rotate the eccentric so it makes contact with the blade, and once it has made contact, tighten the eccentric retaining nut while holding the eccentric in place. Voila! you’ve just adjusted 1 of 12!


Step 7.) repeat.
do every rocker arm that you can move back and forth, then when you’ve done all of those, either take a 22mm wrench and rotate the crank to get at the remaining rockers, or get in the car and click the starter for a split second (with the coil wire disconnected) to get the valves you need to adjust closed. keep doing that until you’ve done all 12!

and thats it. it’s really easy, it just takes time.

[Digital K]

great DIY

[palmer]

Nice work!

[2.5-12]

Thanks for the compliments guys

its my pleasure.

[JPB]

Good write up. Thanks for posting w/ decent pics!

[JPB]

Nice write up. Thanks for taking good pics!

[2.5-12]

Good write up. Thanks for posting w/ decent pics!

Nice write up. Thanks for taking good pics!

of course!

what good is a write-up without decent pictures? (and PINK circles!!)

[Zach]

Awesome write-up!

step 6.) time to adjust it!
with the .010” blade still in place, insert your allen wrench in the small hole in the side of your eccentric. While you do that, losen the 10mm eccentric retaining nut enough where you can move the eccentric back and forth easily with the allen wrench. Once you can move it, rotate the eccentric so it makes contact with the blade, and once it has made contact, tighten the eccentric retaining nut while holding the eccentric in place. Voila! you’ve just adjusted 1 of 12!

that's unfairly easy, by the way.

[2.5-12]

Awesome write-up!



that's unfairly easy, by the way.

thanks

yeah, yeah - I haven't got an S14B23 though