Magnito Contact Breaker Points - Cessna T182 Series Service Manual

MODEL 182 & T182 SERIES SERVICE MANUAL
THESE CONTACT POINTS ARE USABLE
THESE CONTACT POINTS NEED REPLACEMENT
Figure 11-6. Magnito Contact Breaker Points
internal timing need not be checked. If timing is
a. Moisture Check.
out of tolerance, remove magneto and set internal
1. Remove magneto from engine and remove
timing, then install and time to the engine. In the
screws securing the magneto halves together, dis-
event the magneto internal timing marks are off
connect capacitor slip terminal and remove distrib-
more than plus or minus five degrees when the break-
utor. Inspect for moisture.
er points open to fire number one cylinder, remove 2. Check distributor gear finger and carbon
the magneto and check the magneto internal timing.
brush for moisture.
Whenever the magneto halves are separated the
3. Check breaker point assembly for moisture,
breaker point assembly should always be checked.
especially on the surfaces of the breaker points.
As long as internal timing and magneto-to-engine
4. If any moisture is evident in the preceding
timing are within the preceding tolerances, it is places, wipe with a soft, dry, clean, lint-free cloth.
recommended that the magneto be checked internally
b. Breaker Compartment Check.
only at 500 hour intervals. It is normal for contact
1. Check all parts of the breaker point assem-
points to burn and the cam to wear a comparable bly for security.
amount so the magneto will remain in time within
2. Check breaker point surfaces for evidence of
itself.
This is accomplished by having a good area
excessive wear, burning, deep pits and carbon de-
making contact on the surface between the points and
posits. Breaker points may be cleaned with a hard-
the correct amount of spring pressure on the cam.
finish paper.
If breaker point assembly is defective,
The area on the points should be twenty-five percent
install a new assembly. Make no attempt to stone or
of the area making contact. The spring pressure at
dress the breaker points. Clean new breaker points
the cam should be 10. 5 to 12. 5 ounces. When the
with clean, unleaded gasoline and hard-finish paper
contact points burn, the area becomes irregular, before installing.
which is not detrimental to the operation of the points
3.
Check capacitor mounting bracket for cracks
unless metal transfer is too great which will cause or looseness.
the engine to misfire. Figure 11-6 illustrates good 4.
Check the carbon brush on the distributor
and bad contact points. A small dent will appear on
gear for excessive wear. The brush must extend a
the nylon insulator between the cam follower and the
minimum of 1/32 inch beyond the end of the gear
breaker bar. This is normal and does not require
shaft. The spring which the carbon brush contacts
replacement.
should be bent out approximately 20 degrees from
vertical, since spring pressure on the brush holds
NOTE
the distributor gear shaft against the thrust bearing
in the distributor cap.
If ignition trouble should develop, spark plugs
5. Oil the bearings at each end of the distributor
and ignition wiring should be checked first.
gear shaft with a drop of SAE 20 oil. Wipe excess oil
If the trouble definitely is associated with a
from parts.
magneto, use the following to help disclose 6. Make sure internal timing is correct and re-
the source of trouble without overhauling the
assemble magneto. Install and properly time mag-
magneto.
neto to engine.
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