Cummins spark plug for Onan MicroQuiet 3600/4000 — 167-0275 direct-fit replacement, pre-gapped ignition part

High-quality Cummins/Onan 167-0275 spark plug engineered to restore reliable ignition in MicroQuiet 3600 and 4000 generator models.

If your RV or portable power setup uses an Onan MicroQuiet 3600 or 4000 generator, the Cummins 1670275 spark plug is a direct-fit replacement designed to meet the original equipment specifications. This single spark plug (also listed as 167-0275 or part number 690781000520) provides the correct dimensions and performance characteristics for these compact generators, with overall package dimensions roughly 3.3 inches long, 1.3 inches wide, and 0.88 inches tall, and a light weight to match factory components.

What makes this spark plug the right choice for MicroQuiet generators?

The Cummins 167-0275 is manufactured to the tolerances and materials expected for Onan service parts, ensuring consistent ignition and compatibility. It fits the combustion chamber geometry of MicroQuiet 3600 and 4000 models so you don’t have to modify the engine or use adapters.

• Exact OE-compatible fit for Onan MicroQuiet 3600/4000
• Standard pre-gapped for generator ignition systems
• Compact physical size: approximately 3.3" length

How do I install the Cummins 1670275 in my generator?

Installation is straightforward for anyone familiar with basic generator maintenance: disconnect the ignition source, remove the old spark plug with a socket wrench, inspect the boot and wire, then thread in the new plug and torque to the manufacturer’s specification. Reconnect the ignition lead and test run the generator to confirm steady starting and operation.

• Always disconnect power and allow engine to cool first
• Use a spark-plug socket and torque wrench for correct tightening
• Inspect and replace the ignition boot or wire if worn

How often should I replace this spark plug to maintain performance?

Replacement interval depends on usage and operating conditions; recreational or seasonal use may require replacement less frequently than continuous service. Inspect the plug during routine maintenance and replace when electrodes are eroded, fouled, or if starting becomes inconsistent.

• Check plug condition during each major service or annual tune-up
• Replace sooner if exposed to heavy soot, oil, or wet fuel
• Keep a spare plug on hand for trips or extended deployments

What are the physical and shipping details I should know?

This item ships as a lightweight, compact package with dimensions suitable for single-item shipping: about 1.8 cm L x 2.5 cm W x 10.2 cm H with a packaged weight around 0.068 kg (0.15 lb). It is manufactured in China to Cummins/Onan part specifications.

• Package weight: ~0.068 kg (0.15 lb)
• Package dimensions: ~1.8 x 2.5 x 10.2 cm
• Origin: China, produced to OEM standards

Who is this for? RV owners, mobile service technicians, and anyone maintaining Onan MicroQuiet 3600 or 4000 generators will benefit from keeping a Cummins 167-0275 spark plug in their parts kit. It’s intended for routine maintenance and emergency replacement to restore proper ignition and reliable starting without modification. Choose this plug when you need a compact, OEM-compatible replacement that matches factory fit, form, and function.