Adjustment Of Propeller Governor - Piper PA-24 Comanche Service Manual

~IGURE 7-4. WOODWARD PROPELLER GOVERNOR ADJUSTMENT POINTS
POWER PLANT
ISSUED: 8/18/72
7-19. AdjulCrncslt Of Propeller
Goftl'DOt. (Woodward)
(Refer to Fipre 7-4.)
.. Scan: thc enplc in
accordance with the
dircctiODS
liveD
ill Owner', Opcraa.. Manual and allow to
warm up.
b. Push the "PROPELLER" cockpit conrrol
~
far forwud u it
will
' 0 .
At this position the governor
speed adjumftJ conuollcver
will
be apiDst the bi-rpm fiDe adjumn, screw.
c. Observe mpne speed. Adjust the IOvenlor speed by
IIlC&IIS
of the fmc adjusanent screw for 2700
rpm. To do this, rdcuc the fasteners and lift the left side
enpne
cowliDg. Rdease the speed control lever
clamp screw (4) and move the lC'VU relative to the cover scrntions. One serration movement in a clockwise
direction produces a decrease ill speed of 100 rpm; one serration councer-dockwise
increases
the speed 100
rpm. One revolution of the bi-rpm fine adjustment
scre,w
in a clodnriJC direction decreases engine speed 25
rpm. eounter-elockwise rotation illaaaes eftline speed 25 rpm, for each revolution of the screw.
d. After setting the CllJine rpm
at
1700,
ciPteft
the concrol lever ciampi..
screw.
and run the
self-lockinJ nut on the fUle Idjusancnt screw apiDsr the stop riDg projection. Tben safety·wire the head of
the screw to the projcc:rion.
e. With the high RPM adju,unent complete, the conrrol system ShOllld be a.djusted so that the
governor control ann will conract the nigh
RP~
stop when the COCkpit control is .062 of an inch from irs
full forward stop. To adjust the contrOl travel, disconnect the control cable end from the governor control
ann. loosen the cable end .iam nut and rotate the end to obtain the desired control clearance. Reeonneee the
cable end and tighten jam nut.
f.
It is
usuall~'
only necessary to adjUst the high RPM setting of the governor control system,
IS
:he
action automatically takes care of the positive high pitch setting.
i.
Fasten the cowling on both sides.
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PIPER COMANCHE SERVICE MANUAL
2 A21