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Installing Greddy Rocker Arm Stoppers on an SR20DET

December 10, 2009 by Aaron

by: DuckyD

Overview:

Rocker Arm Stoppers (or RAS’s for short) are a must for any SR20DET. They’re pretty cheap, easy to install, and will prevent bent valves. Think of this as an insurance policy for your SR20.

SR20DET Engine Bay View

Tools:

1. 10mm socket
2. FSM
3. Liquid Gasket, pref high temp
4. Tq. wrench
5. Spark Plug socket

Materials:

1.Rocker arm stoppers
2. New valve cover and spark plug gasket (if not re-using the old one)

Procedure:

First, as always, disconnect your battery before servicing your vehicle. Drain your oil. Also disconnect the air-line to the factory oil catch-can and remove the line that goes to the throttle body.
Now start removing the 10mm valve cover nuts. There should be 13 in all (5 on either side and 3 down the middle.

SR20DET Engine Bay View 2

Be very careful as you don’t want to get any debris in your head.
Begin to loosen the cam bolts in alternating order, ie: loosen the front two then the back two, etc. The FSM details exactly how to remove them.

SR20DET After removing valve cover and timing cover

Pic from the FSM:

Cylinder firing order for SR20DET

You’re going to remove the “outside” cam bolts but you still want to loosen the “inside” bolts as well. Keep the bolts in proper order as you take them out.

SR20DET Engine View

The “fingers” of the RAS’s will sit down inside the head and sit just above the rocker-arm. Now you see why they’re called Rocker Arm Stoppers.

SR20DET Engine View 2

Tighten the bolts. Factory spec is 8.7 ft-lbs, from the fsm

SR20DET Engine View 3

SR20DET Firing Order illustration from FSM

The “driver” side is very similar with the exception of this oil baffle. After a search on NICOClub, I found that some owners remove the baffle. Others cut it down for fear of blow-by.

SR20DET Drivers side oil baffle

Removed, as you can see the curves on the end will get in the way of the RAS’s.

SR20DET Drivers side oil baffle 2

After a little time with the Dremmel, the edges are now flat. install the baffle under the stoppers. Be sure verify that the new cut is nice and smooth, you don’t need any metal shavings in your head.

Again this part seems to be optional as some owners have just thrown theirs away. If you don’t have the tools or if the baffle is already missing, don’t sweat it.

SR20DET Drivers side oil baffle modified

installed:

SR20DET modified oil baffle installed

SR20DET modified oil baffle installed 2

All finished.

The factory rubber gasket is reusable and I used Permatex Ultra Gray liquid gasket for a good seal. Other liquid gaskets and RTV’s may work as well. This is the gasket for the sparkplugs.
Edit: Again, I did use the rubber gasket, although it is not pictured here.

SR20DET Spark plug gasket with RTV

Please follow all safety precautions when servicing your vehicle. Failure to do so may result in expensive damages to your car and injury to yourself. This write-up was done in good faith to assist other auto enthusiast. Please check the factory service manual and your local dealer before attempting any work on your car.

Filed Under: 240sx Articles, Product Review

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