Hartzell HC-D2MV20-3 Series Owner's Manual And Logbook page 127

(d) On Lycoming engines, the clearance between the
jack plate and any portion of the hub or spinner ring
should be no less than 0.063 inch (1.59 mm) and no
greater than 0.125 inch (3.17 mm). On Continental
engines, the clearance between the jack plate and
any portion of the hub or spinner ring should be
exactly 0.125 inch (3.17 mm).
CAUTION:
(e) Adjust the spacers behind the rear cone to obtain
the applicable clearance. Do not allow the hub nut to
engage less than five full threads. Restrict the travel
to maintain no less than clearance.
(f) Move the valve control until the valve spool touches
the low pitch stop on the link.
NOTE:
(g) Set the cockpit propeller control to 0.125 inch
(3.17 mm) from the bottom of travel.
(h) Clamp the vernier control with clamp screws.
(i) Pull the cockpit propeller control into full high pitch
and force the piston back to check for washers,
screws, or safety wire that may prevent the piston
arms from touching the outer diaphragm ring B-120
or high pitch position.
(j) In the high pitch position, the valve spool should
extend 1.31 inch (33.3 mm) or less (preferably less)
beyond the valve body casting.
(k) Run the engine up and check the static RPM.
1 For fine adjustment, replace the low pitch stop
screw.
2 An adjustment of more than 100 RPM may only
be performed by a certified propeller shop.
INSTALLATION AND REMOVAL
Propeller Owner's Manual
DO NOT ALLOW THE HUB NUT TO
ENGAGE LESS THAN FIVE FULL
THREADS.
The spool should extend 1.31 inches
(33.3 mm) beyond the valve casting. Bend
the stop as necessary to achieve this
setting.
140
61-00-40
Page 3-61
Nov/02