Prokomon Engine Cylinder Leak Down Tester Kit — Dual-Gauge Leakdown Set with M14 Extension Rod, 0–100 psi Accuracy

Prokomon Engine Cylinder Leak Down Tester Kit is a complete dual-gauge leakdown set for diagnosing piston rings, valves, head gaskets and other pressure loss sources in gasoline engines. This professional-style kit connects to an air compressor to pressurize a single cylinder and measure both absolute pressure and leakage percentage so you can pinpoint where combustion pressure escapes. The set includes a dual gauge manifold, multiple adapters and an M14 extension rod to reach spark plug wells on most petrol engines. It’s designed for home mechanics, technicians and diagnosticians who want a reliable way to verify cylinder sealing without removing the head.

How does this tool reveal engine problems?

The tester pressurizes one cylinder through the spark plug hole while one gauge shows supplied pressure and the other shows the percentage leaking away, exposing leaks past rings, valves or head gaskets. Listening and using the included adapters helps you localize leaks — intake, exhaust, crankcase or coolant passages.

• Dual gauges: real-time pressure and leak rate readouts for clear diagnosis
• Adapters: straight and angled push-on connectors for easy access to spark plug wells
• Extension rod and hose: reach recessed plugs on modern engines
• Audible and visual cues: hear air in intake/exhaust or bubbling in coolant

What comes in the Prokomon kit and how do I hook it up?

The kit bundles a double-gauge manifold with an 18" hose, a rubber hose, metal threaded adapters, two universal push-on connectors, a longer extension hose and an M14 aluminum extension rod. Connect the manifold to your compressor, screw or push the appropriate adapter into the spark plug hole, and use the regulator knob to set test pressure.

• Manifold assembly with AR2000 regulator and standard air plug
• 1x 18" hose plus an extra extension hose for flexibility
• 2x threaded adapters and 2x push-on connectors for most petrol engines
• M14 extension rod for deep or recessed spark plug wells

Which engines and measurements does it support?

The gauge reads 0–100 psi (0–7 bar) and shows leakage as 0–100% with 0.5% accuracy, making it suitable for most gasoline engines that use spark plugs with plug openings up to about 20 mm. It verifies whether loss of compression is significant enough to require further repair or teardown.

• Measurement range: 0–100 psi / 0–7 bar and 0–100% leakage
• Accuracy: approximately 0.5% for dependable comparative readings
• Compatibility: petrol engines with spark plug wells up to ~20 mm diameter
• Includes adapters to fit a wide variety of plug threads and recessed layouts

How should I interpret the results and next steps?

A low leak percentage indicates good sealing; higher percentages point to worn rings, leaking valves, cracked cylinders or a failed head gasket. Use auditory checks and the kit’s adapters to localize the leak, then decide: valve servicing, piston/ring work, head gasket replacement or further pressure / borescope inspection.

• 0–5%: typical tolerance for a healthy cylinder
• High leak to intake manifold: likely valve or intake leak
• High leak to exhaust: possible exhaust valve issue or port leak
• Air in coolant or bubbles: suspect head gasket or crack into cooling passages

Who is this for This Prokomon leakdown kit is aimed at DIY mechanics, independent shops and fleet maintenance teams who need a portable, accurate way to assess cylinder sealing without engine disassembly. It’s useful for routine diagnostics, pre-purchase inspections and troubleshooting rough-running or low-power gasoline engines. If you have an air compressor, basic mechanical skills and need to localize internal leaks before committing to major repairs, this kit is a practical diagnostic investment.

FAQ

Q: Do I need an air compressor to use this kit?

A: Yes. The Prokomon kit requires an external air compressor to supply test pressure; compressor not included.

Q: Can this test diesel engines or only gasoline?

A: This set is designed for gasoline engines with spark plugs; diesel engines typically need different adapters and higher pressures.