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4-134 L Engine Tune Up Specifications - GPW

Tune Up Illustration

Looking for Engine parts for your vintage Willys or Jeep? Search by Category or by Diagram

Battery Specs:
Voltage6 or 12 Volts
Terminal GroundNegative
Specific Gravity:
Fully Charged1.260
Recharge at1.225
Load Test, minimum:
6-volt Battery5 volts
12-volt Battery10 volts
Spark Plugs Specs:
MakeChampion J-8
Gap.030"
Torque25 to 33 lb.-ft.
Distributor Specs:
Rotation viewed from topCounterclockwise
Cam Angle42°
Point Gap.020"
Arm Spring Tension17 to 20 oz.
Wiring order and directionFiring-Counterclockwise
Ignition Timing5° BTC
Marks5, IGN, or TC
Location: Flywheel or Timing Cover
Compression Pressure Cranking: 90 to 110 psi.
Valve Specs:
Tappet Clearance Cold: 
Intake.016"
Exhaust.016"
Timing (Intake Opens)9° BTC
Engine Idle Speed600 rpm.
Firing Order1-3-4-2

* Excerpt from the Service Manual for 41-45 MB, GPW

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Made-To-Order:This wooden jigsaw puzzle needs to be handcrafted by a skilled Stave artisan. Made to order puzzles may take 3-6 weeks to ship.

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