Sr20det rocker shims

[SR20drftSX]

"I was wondering if anyone knew or knew someone that knows how to adjust the shims that go between the valves and the rockers? It doesn't have to be just a sr20det cause im sure theres more then this motor that uses shims for this?"

this is not my questions..its from a member on a local board here in NY just trryin to help out a fellow 240 owner

[180fan]

you get new shims. pretty much all there is to it. get the cam rotated to the back end away from the lobe and you take a feeler gauge to the gap between the rocker arm and the cam and measure that. buy new shims according to what you need. remember though, you've two shims and it rests on two different shims, you'll need to size them accordingly.

[jaytv1019]

Well with the SR20 motor, there are Hydrolic (sp?) lifter setup that automatically adjusts so that you don't have to adjust the shims. From what I understand with this set up there is almost zero up keep.

Do you need to purchase new shims?

Could you be a little more specific on what you are doing. Are you changing cams? -Or- just performing some needed maintenance?

[compression]

Since each rocker arm pushes on two valves, the "shims" make sure that the rocker is level, i.e. the lash surface is parallel to the cam lobe surface, so that the cam pushes down evenly on the rocker.

In reality, there is actually one "shim" and one "guide". The rocker arm has one leg machined to fit into the guide, and the other leg sits on the shim. Dont put the unmachined leg on the guide, it will break, I have experienced that.There is procedure for measuring and selecting what thickness shim to use, it is the SR20DET FSM, which can be downloaded from any number of places. the best procudure is to label the parts you removed and reinstall them in the same location.

The hydraulic lash adjusters only adjust lash between the cam and the rocker, they dont influence what shims you use on the valve stems. Yes, they are zero maintenance, but make sure they are fully bled before installtin, if you have removed them. That procedure is also in the FSM.

[180fan]

if you're keeping HLA's then nope, if you go solid lash like a few of us have, then yeah you'll need to keep an eye on those.