23
AeroVee 2.1
Rev Z. 01/14/2015
Sonex Aircraft
LLC
© 2014 All Rights Reserved
ROCKER SHAFT INSTALLATION
Parts Required:
__ Push Rods, ACV-P06-51
__ Pushrod Measuring Tool
__ Cylinder Head Nuts and Washers, from ACV-P01-86
__ Rocker Arm Nuts, from Valve Cover package
__ Rocker Shaft Assembly, ACV-P02-10
Assembly Instructions:
Note: Pre-assembled rocker assemblies often need to be disas-
sembled for proper installation.
__ 1. Assemble the rocker shafts with the gap in the rocker
blocks facing the cupped end of the rocker arms and the
thin shims evenly distributed.
Note: Steps 3 through 19 apply to one side of the engine at a
time and will be repeated for each side.
__ 3. Place a square spacer from the rocker arm package over
each of the rocker shaft mounting studs on a cylinder
head.
__ 2. Turn each adjuster fully counter-clockwise until the pad
lightly contacts the rocker arm, and then turn it back
clockwise 1.5 turns.
The rocker blocks are installed so their gaps are toward the
cupped end of the rocker arms.
GAP IN ROCKER BLOCKS
Two different swivel pads exist. The one on the right is a large,
swiveling pad, the one on the right is a ball with a flat spot.
The flat spot on the ball must contact the valve's stem.
__ 4. Place a rocker assembly over the mounting studs and
inspect for interference between the rocker arm as-
sembly and the head studs. If the rocker arm assembly
contacts the head studs, trim the ends of the head studs
to remove the interference.
The spacers placed under the rocker blocks influence
the alignment of the rocker arm swivel pads to the valve
tip. Proper alignment is achieved when the flat of the
swivel pad is partially off-center from the valve stem.
This is typically achieved with 1 or 2 shims under each
rocker block.
Incorrect - Too
few spacers. The
swivel pad is cen-
tered on the valve
stem.
Incorrect - Too
many spacers. The
flat of the swivel
pad is off the edge
of the valve stem.
Correct
- The flat
of the swivel pad is
off center from the
valve stem but sits
fully on the valve
stem. Typically 1 or
2 shims.