Behind every TAKUMI spark plug is a vertically integrated factory: precision grinding, laser welding, ceramic sintering and automated electrical testing under one roof.

Product Overview

TAKUMI R6GC1-77 spark plug is a form, fit and function equivalent replacement for OEM part 3016663. TAKUMI R6GC1-77 prechamber resistor spark plug for C-A-T G3500 series gas engines. Replaces 346-5123 family.

Every TAKUMI unit is produced in an ISO 9001 and IATF 16949 certified factory, 100% tested before shipment. The plug is engineered for long service life in continuous operation, with a nickel-plated shell, copper-core electrode and high-grade ceramic insulator.

Key Specifications

• TAKUMI TypeR6GC1-77
• Thread SizeM18 x 1.5
• Reach19 mm
• Hex Size20.6 mm
• Seat TypeFlat / Gasket
• Spark Gap0.3 mm
• Heat Range77
• Electrode TypePrechamber
• ResistorYes

Cross Reference

• C-A-T346-5123 / 284-8313 / 199-9012 / 146-2588 / 430-4521 / 301-6663 / 479-7702

Applications

• CAT G3508 / G3512 / G3516 / G3520 gas generator engines
• Natural gas, biogas, landfill gas

Advantages

• Drop-in replacement - no engine parameter changes required
• Reliable ignition under high pressure and lean combustion
• Anti-corrosion nickel-plated housing
• 95% alumina insulator for heat and shock resistance
• Monolithic resistor for stable conductivity
• Factory direct with competitive pricing and short lead time

OE numbers are for reference only. Final fitment should be confirmed before ordering.

Factory & Quality Control

Our QC team records batch numbers for full traceability. Should any issue arise, we can quickly isolate the production batch and respond within 48 hours.

Production Workshop

TAKUMI runs a fully integrated manufacturing base: CNC machining, automated assembly and 100% functional testing under one roof.

From raw material to finished spark plug, every process is controlled in-house with ISO-certified procedures.