D2 compression release

I had a similar issue on my 212 with a D311 engine. When I pulled the valve cover, and followed the linkage down to the end of the shaft, I found the cam that releases compression had somehow slipped off it's location on the rod and quit making appropriate contact. I took about four hours with my 10 thumbs, but I finally got it back into position and I have not had any issue with it since. With competent help/skill, it should have only taken about 30 minutes to accomplish the task.

Hope that helps.

Stephen is correct. D3400 compression release works on lifters along side of the cylinder block.


I think the linkage can be assembled incorrectly so that is the first thing I would check. Take each lever loose and move it manually to see where it actually contacts the lifter inside. Should feel it compressing the intake valve spring and it would be even better to take the valve cover off and watch the rocker arms

I remember someone found the decompression cams were worn so badly they no longer impinged on the lifters and had to be built back up with welding.

So are the cams behind each plate where the linkage goes in the block? And do I have to worry about oil coming out when I take it apart?

Yes, and the amount of oil to come out will just be what's in the gallery, if any. Put an icecream container under it and have some shop towels ready. My levers move between 11 oclock and 2 oclock.

[attachment=47639]IMG_3110.jpg[/attachment][attachment=47639]IMG_3110.jpg[/attachment] I got to digging around with the compression release and there is wear on the cam but I'm not sure if it's enough to make it not work. Could it be a combination of too much valve clearance and worn cams? I've never adjusted valves before but have read the manual on it.

You got it.
Check and adjust your valve clearance. Providing everything mechanical is sano, a proper adjustment will make the compression release work as designed.

Good luck and post your results.

Make sure to adjust the valves with the compression lever in RUN (put it in start to make it easy to rotate crank then move back to RUN to adjust). I made this mistake recently when I reassembled the head on one of mine as I didn't realize how the compression release functioned (raises valves) so I had to re-adjust. If that's the D3400 the cold valve lash setting is .012 and hot is .010

Maybe it's possible that someone previous on yours made the mistake I did and that's why the compression release isn't doing anything.

Jordan

I adjusted the valves and they were way off. Some I screwed in over a turn to get 12 tho clearance cold. The compression release seams to be working now. Next I will warm things up and check them again and it needs an oil change. Thanks for all the advice