TAKUMI R6GC1-77 Spark Plug M18x1.5 Thread Generator Spark Plug For 301-6663 346-5123 479-7702 430-4521 194-8518 104-3170

As a spark plug manufacturer with decades of OEM experience, TAKUMI controls every step from electrode material selection to final 100% functional testing.

Product Overview

TAKUMI R6GC1-77 spark plug is a form, fit and function equivalent replacement for OEM part 301-6663. 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

In our quality laboratory, every production batch is inspected with precision gauges, high-voltage spark testers and sealing equipment before packing.

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.