Maintenance - Cessna T182 Series Service Manual

MODEL 182 & T182 SERIES SERVICE MANUAL
To locate the compression stroke of number one cy- c. Connect a timing light to the capacitor terminal
linder, remove the lower spark plugs from each cy- at the front of the magneto and to a good ground.
Under except number one cylinder. Remove the top d. Turn propeller back a few degrees (opposite of
plug from number one cylinder. Place thumb of one normal rotation) to close the contact points.
hand over the number one cylinder spark plug hole
and rotate the crankshaft in the direction of normal NOTE
rotation until the compression stroke is indicated by
positive pressure inside the cylinder lifting the thumb Do not turn the propeller back far enough to
off the spark plug hole. After the compression stroke engage the impulse coupling or the propeller
is obtained, locate number one piston at its advanced will have to be turned in normal direction of
firing position. Locating the advanced firing position rotation until the impulse coupling releases,
of number one cylinder may be obtained by use of a
then backed up to slightly before the firing
timing disc and pointer, Timrite, protractor and position.
piston locating gage or external engine timing marks
alignment. e. Slowly advance the propeller in the normal direc-
tion of rotation until the timing light indicates the con-
NOTE
tact points breaking. Magneto mounting clamps may
be loosened so that the magneto may be shifted to
External engine timing marks are located on break the points at the correct firing position.
a bracket attached to the starter adapter, f. Tighten magneto mounting nuts and recheck
with a timing mark on the alternator drive timing.
pulley as the reference point. g. Repeat steps "a" through "f" for the other mag-
neto.
In all cases, it must be definitely determined that the h. After both magnetos have been timed, check syn-
number one cylinder is at the correct firing position chronization of both magnetos. Magnetos must fire
and on the compression stroke, when the crankshaft at the same time.
is turned in its normal direction of rotation. After i. Remove timing devices from magneto and engine.
the engine has been placed in the correct firing posi-
j. Connect spark plug leads to their correct mag-
tion, install and time the magneto to the engine in the neto outlets.
following manner.
NOTE
NOTE
The No. 1 magneto outlet is the one closest
Install the magneto drive coupling retainer
to the ventilation plug on the side of the
and rubber bushings into the magneto drive magneto having the manufacturer's insignia.
gear hub slot. Insert the two rubber bush- The magneto fires at each successive outlet
ings into the retainer with the chamfered in clockwise direction. Connect No. 1 mag-
edges facing toward the front of the engine.
neto outlet to No. 1 cylinder.spark plug lead,
No. 2 outlet to the next cylinder to fire, etc.
a. Turn the magneto shaft until the timing marks Engine firing order is listed in paragraph
visible through the ventilation plug holes are aligned
11-12.
(red-to-red or black-to-black) and insert a timing
pin (or 0. 093 inch 6-penny nail) through the timing
hole in the bottom of the magneto next to the flange k. Connect toggle switch (primary) lead to the ca-
and into the mating hole in the rotor shaft. This pacitor terminal on the magneto.
locks the magneto approximately in the firing posi-
tion while installing on the engine.
NOTE
NOTE Magneto (primary) lead nut torque range is
13-15 in. -lbs. Exceeding this torque range
If the magneto drive gear was disengaged
could result in possible condenser damage.
during magneto removal, hold the magneto
in the horizontal position it will occupy 1. Inspect magneto installation and install engine
when installed, make certain that the drive cowling in accordance with paragraph 11-3.
gear coupling slot is aligned with the mag-
neto coupling lugs. If it is not aligned, pull
the magneto drive gear out of mesh with its 11-78. MAINTENANCE. Refer to Section 2 for in-
drive gear and rotate it to the aligned angle, spection intervals for the breaker compartment. Re-
then push it back into mesh. DO NOT WITH- fer to Section 2 for intervals for checking magneto-
DRAW THE MAGNETO DRIVE GEAR FROM
to-engine timing. If timing is 24 (plus 0, minus 2),
ITS OIL SEAL.
b. After magneto gasket in place, position the
magneto on the engine and secure, then remove the
timing pin from the magneto. Be sure to remove
this pin before turning the propeller.
11-26 Revision 1