Cummins Onan Spark Plug 167-0275 for MicroQuiet 3600/4000 — Direct-Fit OEM Replacement, Reliable Ignition

The Cummins 1670275 Onan spark plug is a direct-fit replacement designed to restore reliable ignition in Onan MicroQuiet 3600 and 4000 series generators.

When your portable generator needs dependable starting and steady combustion, using the correct spark plug matters. The Cummins/Onan 167-0275 spark plug is manufactured to Cummins specifications for factory compatibility with MicroQuiet 3600 and 4000 models. It arrives as a compact, ready-to-install ignition component with consistent dimensions and a lightweight profile that makes handling and swapping straightforward.

How does the 1670275 spark plug fit my MicroQuiet generator?

Designed as a direct replacement for Onan MicroQuiet 3600 and 4000 generators, this spark plug matches the OEM form factor and electrical requirements. Installers can expect the same reach and electrode placement as the original equipment, so no engine modification is necessary.

• Compatible models: Onan MicroQuiet 3600 & 4000
• OEM part reference: Cummins/Onan 167-0275
• Direct-fit design for straightforward replacement
• No adapter or special tools required for typical installations

What are the physical specs and packaging details?

The replacement spark plug is compact and lightweight for easy handling during maintenance. Package dimensions and weight reflect a small, protective retail pack that is convenient to store and identify among service parts.

• Overall spark plug length: 3.3 (as specified by manufacturer)
• Approximate width: 1.3 and height: 0.88 (manufacturer data)
• Item package weight: about 0.068 kg (0.15 lb listed in some sources)
• Package size: 1.8 cm L x 2.5 cm W x 10.2 cm H

Why choose the Cummins/Onan branded replacement over generic plugs?

Branded Cummins/Onan spark plugs are manufactured to meet the original equipment tolerances and performance targets for Onan engines. That reduces the risk of fitment issues and helps maintain the generator’s designed ignition timing and combustion characteristics.

• Made to Cummins/Onan specifications for reliable compatibility
• Consistent electrode geometry and materials for expected performance
• Reduces troubleshooting time compared with mismatched aftermarket plugs
• Backed by Cummins/Onan part numbering for easier parts tracking

How should I replace the spark plug, and what basic precautions are recommended?

Replacement is a routine service task on small generators but should be done with the engine cool and following safety steps. Use the correct spark plug socket, torque to the manufacturer’s recommended specification, and inspect the ignition wire and boot for wear while replacing the plug.

• Ensure engine is cool and ignition off before starting work
• Use an appropriate spark plug socket and torque wrench for correct tightening
• Check and, if needed, replace the ignition boot and wire to ensure good contact
• Follow generator manual torque specs and gap recommendations if present

Who is this for: The Cummins 1670275 Onan spark plug is aimed at RV owners, mobile contractors, and homeowners who maintain Onan MicroQuiet 3600 or 4000 generators and want a factory-equivalent replacement part. It suits do-it-yourselfers who perform routine generator maintenance and service technicians who need dependable, specification-matching ignition components for small portable or onboard generator repairs.