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Case SC condenser

B

Bhunt

Member
Appreciate any help does anyone got a test for a distributor condenser on a 52 SC I've replaced it still no spark out of the cap I know a lot of them are bad out of the box. Coil has spark and there's 12.6 volts to the upper half of the points.

Thanks for any help
Byron
 
Take the condenser out if you get spark
the condenser is bad. The purpose of
condenser is to keep points from
premature failure it does not create
spark.
 
I did clean that up this morning I put die electric grease on it. I now have spark at the plugs. Tractor been sitting for year and a half. Thank all of you folks for the help. I will likely get another cap and pull the carb
And clean it out
 
After setting that long, you may need to pull the plugs & give each cylinder a shot or two of oil from a squirt oil can. The rings might be dry and not developing enough vacuum to pull in a charge of fuel/air mixture to make a bang in the cylinders. I like "marvel mystery oil" for this job. Leave it set for at least a couple of hours, overnight is even better, than you should use at least a half dozen squirts. You need some lubrication to get the rings to create vacuum.
 
12.6 is to high a voltage at the points, very very short point life, and with to close a gap, the primary (low) voltage will jump across and not interrupt the mag fld in
the coil, that induces the spark. Ignition resistor, ala Chrysler products with points or internal resistor coil is necessary. Larry
 
With the points closed there should be no voltage present at the points. If you have no spark and the points are closed and there is voltage on the movable point the contacts need cleaned, the points closed are at ground potential. If the points are open the voltage at the points will rise to system voltage as there is no load on the coil and resistor if added to drag the system voltage down at the distributor side of the coil. when the system is in operation the coil/ resistor circuit should be at about 3.5 -4 ohms to produce a current flow of appx 3 amps (Ohm's Law) when the points are closed. A coil with a 4 ohm primary does not require a resistor and will be often times be advertised as a built in resistor type coil. It is imperative in my mind to do resistance reading on the coil primary to insure the current flow across the points is not excessive.
 
To elaborate on the condenser a bit, when the points break, the magnetic field in the coil collapses and creates a high intensity magnetic field in the coil secondary and induces a very high voltage which goes to the distributor center post. An additional result is that a very high voltage up to (300 V) is induced by the collapsing magnetic field back into the primary, this very high voltage then rushes into the condenser which allows time for the points to open far enough to minimize the arcing at the points. When the voltage in the primary windings decays to less than that built up in the condensed the condenser then discharges back into the primary further intensifying the spark. Try disconnecting the condenser and see how much the spark diminishes, most times there is not enough spark for the engine to run!
 
Let us know when you get the old girl
going, please. SC's are pretty tough old
gals and they can be cantankerous, too.
 
Glad you got spark now. Have you checked compression? My dad had an SC that sat several years had some valves stuck and bent push rods. Once that was rectified she purrs like a kitten. Been converted to 12 V starts easy fun to drive. Love the roosting pole on the steering.
 
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