Sliding Rocker Arm Shafts

[Hector]

I installed new rocker arms and shafts, and clean the springs and washers. Everything is lubed. Now one thing that happens is that the shafts will slide out a bit from the pressure of the springs: the exhaust shafts slide toward the front of the head the the intake shafts slide toward the rear. I have to use some head bolts to stop them from sliding out more.

http://www.geocities.com/frothlikn/classic_tan13.html

As a result, the exhaust rocker arm excentrics are slightly off center from the valve tip as reference by the red line.

http://www.geocities.com/frothlikn/classic_tan14.html

and so are the intake rocker arm excentrics.

http://www.geocities.com/frothlikn/classic_tan15.html

Both sides seem to be off from center tip by 20 to 30 mils. Is this normal?

[Bill R.]

valve seating surfaces clean.






I installed new rocker arms and shafts, and clean the springs and washers. Everything is lubed. Now one thing that happens is that the shafts will slide out a bit from the pressure of the springs: the exhaust shafts slide toward the front of the head the the intake shafts slide toward the rear. I have to use some head bolts to stop them from sliding out more.

http://www.geocities.com/frothlikn/classic_tan13.html

As a result, the exhaust rocker arm excentrics are slightly off center from the valve tip as reference by the red line.

http://www.geocities.com/frothlikn/classic_tan14.html

and so are the intake rocker arm excentrics.

http://www.geocities.com/frothlikn/classic_tan15.html

Both sides seem to be off from center tip by 20 to 30 mils. Is this normal?

[Hector]

Thought I screwed up/forgot to assembly something somewhere. Thanks again.

[George M]

Good info from Bill on that score. Hector be sure to loctite the rocker shaft end plugs in place. Couldn't find a torque spec for those..but they are not very tight. The plugs retain oil pressure to lubricate the rocker arms up through the hollow shafts.
George

[Hector]

Very ingenious to have the excentric slightly off center from the valve tip/stem to allow the valves to rotate to clean the seats. Bill, you could've easily become a brain surgeon...