4-134 F Engine Tune Up Specifications - CJ-3B

Engine Tune Up Illustration

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Battery Specs:
Voltage 6 or 12 Volts
Terminal Ground Negative
Specific Gravity:
Fully Charged 1.260
Recharge at 1.225
Load Test, minimum:
6-volt Battery 5 volts
12-volt Battery 10 volts
Spark Plugs Specs:
Make Champion J-8
Gap .030"
Torque 25 to 33 lb.-ft.
Distributor Specs:
Rotation viewed from top Counterclockwise
Cam Angle 42°
Point Gap .020"
Arm Spring Tension 17 to 20 oz.
Wiring order and direction Firing-Counterclockwise
Ignition Timing 5° BTC
Marks 5, IGN, or TC
Location: Flywheel or Timing Cover
Compression Pressure Cranking:  90 to 110 psi.
Valves Specs:
Tappet Clearance Cold:
Intake .018"
Exhaust .016"
Timing (Intake Opens) 9° BTC
Engine Idle Speed 600 rpm.
Firing Order 1-3-4-2

* Excerpt from the Service Manual for Universal Jeep Vehicles page 25