Rocker Shaft Upgrade

The stock Toyota rocker shafts have a press-in expanded plug installed in one end.

This plug has been known to fail. The plug, which looks like a freeze plug, will pop out.

When the plug pops out you loose oil pressure to the VVT and VVL system.

Your engine will not run properly and it's a very difficult problem to diagnose.  Not a simple repair either.

I replace the press-in plug with a tapered threaded set screw.

IMG 4038