Do i torque my rocker arms down on '88 caprice w/307 ? if so what is the torque specs on them
The nut is a self locking nut. so there is no torque spec for them. What you do is set a preliminary clearance with the tappets pumped up, then set final clearance/lash when engine is fired up initially.
The engine is started and allowed to come up to operating temperature- put foil over the hole in the pushrod end of the rocker arm to reduce oil spray, nut is backed out slowly until clatter is heard, and the nut slowly tightened until noise just disappears, then the nut is tightened in 1/4 turn steps until 1 full turn in has been reached. At each 1/4 turn pause, allow engine idle to smooth out before proceeding.
Once all valves are adjusted, you are ready to put the covers back on and finish the rest of the assembly.
For initial set point, when building the engine up, make sure the cam lobe is on the heal (no lift) portion of the cam, and pump up the lifter until significant resistance is felt, and tighten the rocker adjusting nut until you you feel actual resistance to turning the pushrod. move to the next valve.
Jan 09, 2012 |
Cars & Trucks