Cm870 tick

[pearce trucking]

Unilevers is talking about your Jake rocker springs being worn out. I just reassembled my rocker levers yesterday. On the passenger side rocker shafts, the Jake rocker is the center rocker of each cylinder. There is a circular cap held in by a snap ring on the back of each one. That cap holds a spring that loads a pin which settles in to a hole in the rocker shaft when the Jake is in detent position. If the springs wear out, the pin won't hold in the detente position hole on the rocker shaft.
The springs are cheap and can be replaced by removing the snap ring and cap and installing a new one. If the pins are worn you should be able to pull them out with a magnet after you remove the spring.
The "pins" are called check valves, not pins fyi.