SPARK PLUG AND GASKET J8C 6/12 VOLTS I X
14mm, med 13/16 in hex.
PER PIECE
J8C spark plug with gasket – 6/12 volt
Champion 841 equivalent
High-quality replacement spark plug for historic jeeps with 134 ci four-cylinder engines. This spark plug is suitable for both 6 volt and 12 volt ignition systems and is supplied complete with gasket. The J8C spark plug (modern equivalent of the original Champion J8) features a copper core for optimal conductivity and reliable spark formation.
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Type J8C spark plug with copper core |
Voltage 6 volt and 12 volt |
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Thread 14 mm with 13/16" hex |
Contents 1 spark plug + gasket |
Features
- Suitable for both 6V and 12V ignition systems
- Copper core for improved conductivity and durability
- Complete with special gasket seat
- 14 mm thread, 3/8" reach, 13/16" hex
- Modern replacement for original J8 spark plug
★ Direct replacement for the classic spark plugs in Willys jeeps. Delivers reliable performance in vintage ignition systems without resistor (non-resistor type), as originally specified for these engines.
Installation notes
Recommended spark plug gap: 0.020" to 0.030" (depending on distributor type). Hand-tighten the spark plug with the supplied gasket, then torque to 34 lb-ft (46 Nm) for cast iron cylinder head. Check spark plug gap before installation. Note: over-tightening increases electrode gap.
Compatibility
This spark plug fits jeeps with L-134 Go Devil (flathead) and F-134 Hurricane (F-head) four-cylinder engines. Not suitable for engines with modern electronic ignition requiring resistor spark plugs. Cross-reference: Autolite 295, NGK B6S.
Historical context
The J8C spark plug is the modern successor to the legendary J8 spark plug that was supplied as standard in Willys jeeps from the Second World War through to the 1960s.
This description was generated automatically. Unsure about fitment? Contact us at info@willys.be.
⚠ Spotted an error in this description? Report it to info@willys.be
This part is intended for the restoration of historic military vehicles. Fitting, aligning, deburring or reworking is part of that work and is inherent to the nature of these goods. Dimensional variation also exists between original vehicles.
Installation requires technical knowledge of the vehicle. Unsure whether this part suits your version? Ask us before purchase at info@willys.be.
This part fits:
| Model | Years |
|---|---|
| Military jeeps | |
| Willys MB | 1942, 1943, 1944, 1945 |
| Ford GPW (early) | 1942 |
| Ford GPW | 1942, 1943, 1944, 1945 |
| Hotchkiss M201 | 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 |
📐 Diagrams & technical drawings
From the original Technical Manual TM 10-1513 — Maintenance Manual — only for Willys MB / Ford GPW (1942)
