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10) Switch off the timing unit and disconnect it from the magneto.
11) Install plugs (3) on the magneto.
12) Connect magneto ends (5), bonding strap (11) (if installed) and ground wires (4).
13) Coat electrical connections with varnish (TB 07-901).
14) Mark nuts (7) with a red paint line.
15) Install the ignition harnesses - refer to 74-20-01.
ACAA
Validity : S / N 1 - 9999
Page 402
74-10-01
(DA) OCT 02
16) Make sure all the tools and materials are removed and the work area is clean and free from debris.
17) Install the engine cowlings - refer to 71-10-01.
18) Perform a test run-up - refer to 05-30-02.
ACAA
Validity : S / N 1 - 9999 74-10-01Page 403
(DA) OCT 02
1 - Seal
2 - Magneto
3 - Plug
4 - Ground wire
5 - Magneto end
6 - Switch terminal
7 - Nut
8 - Lockwasher
9 - Clamp
10 - Cotter pin
11 - Bonding strap (if installed)
Magnetos - Removal / Installation
Figure 401
ACAA
Validity : S / N 1 - 9999 74-10-01Page 404
(DA) OCT 02
DISTRIBUTION
DESCRIPTION AND OPERATION
1. GENERAL (Figure 1)
The distribution is the part of the system used to carry high voltage current from the electrical power source to the spark plugs to ignite the air/fuel mixture.
The distribution consists of :
- ignition harnesses,
- spark plugs.
2. LOCATION (Figure 2)
COMPONENT QTY AREA ACCESS DOOR REFERENCE
Ignition harness 2 100 121 / 131 74-20-01
Spark plug 12 100 121 / 131 74-20-02
3. DESCRIPTION
A. Ignition harness
The ignition harness is used to carry to the spark plugs the high voltage current produced and distributed by the dual magneto.
The shielded cables connect the magneto distributor to the spark plugs. They run around the engine and have threaded ends to which insulating porcelains, fitted with a small spring, are secured. This spring is used for the contact between the wiring and the spark plug.
B. Spark plug
The spark plugs are secured to the cylinder heads. There are 2 spark plugs per cylinder, one at the top and one at the bottom. Each spark plug is supplied by the dual magneto.
The spark plug generates a spark, between 2 electrodes, from the high voltage current.
ACAA
Validity : S / N 1 - 9999
Page 1
74-20-00
(DA) OCT 02
14710000AABGVZ14101
Distribution - Electrical schematic
Figure 1
ACAA
Validity : S / N 1 - 9999 74-20-00Page 2
(DA) OCT 02
®
14742001AAABWZ4100
Distribution - Identification and location of components
Figure 2
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