DAYUAN Diesel Compression Tester Kit 17-Piece 0–70 bar Gauge with 14in Hose & Adapters

DAYUAN's 17-piece diesel compression tester kit is a complete diagnostic set with a 0–70 bar (0–1000 psi) gauge, release valve, and a range of glow plug and injector adapters for accurate compression checks on most diesel engines.

Whether you're a professional mechanic or a DIYer troubleshooting a diesel truck, tractor, or car, reliable compression readings are essential to identify worn piston rings, leaking valves, or head gasket issues. This DAYUAN kit bundles a high-range analog gauge with a 14-inch flexible hose and a full complement of adapters so you can access combustion chambers through glow plugs or injectors on many common diesel engine types.

How does this kit measure compression accurately?

The kit's heavy-duty analog gauge reads from 0 to 70 bar (0–1000 psi) and includes a bleed/release valve for controlled decompression after each test. A 35.5 cm (14 inch) flexible hose lets you position the gauge away from hot engine parts for safe, repeatable readings.

• Robust 0–70 bar / 0–1000 psi gauge for wide-range diagnostics
• Built-in release valve allows safe pressure venting
• 14-inch flexible tubing for easier access in tight engine bays
• Clear analog dial for quick visual comparison between cylinders

Which adapters are included and what engines do they fit?

The set contains nine glow plug adapters and four injector adapters covering many metric thread sizes commonly found on diesel engines. Each adapter is labeled for quick selection, and the assortment supports a broad spectrum of light- and medium-duty diesel engines.

• 9 glow plug adapters, including M10 and M12 variants, various lengths for reach
• 4 injector adapters: M20x1.5, M22x1.5, M24x1.5, and M24x2.0 with specific lengths
• Adapters designed to thread into glow plug or injector ports for leak-tight seals
• Includes an adapter resetter tool and convenient shortcuts for attachment

How do I use this tester safely and effectively?

Prepare the engine by disabling fuel and ignition, then remove the glow plug or injector to insert the appropriate adapter. Crank the engine several revolutions while watching the gauge; record peak pressure for each cylinder and use the release valve to safely bleed pressure before removing the hose.

• Always disable fuel and ignition before testing to prevent starts
• Select the correct adapter and ensure a tight seal before cranking
• Crank engine consistently, note peak readings, and bleed with the valve
• Compare readings across cylinders to spot worn rings, valves, or head issues

What maintenance does the kit require to stay reliable?

Keep the gauge, hose, and adapters clean and dry; store them in the provided case to protect threaded fittings and the dial. Periodically check adapter threads and the hose for wear or tears and ensure the gauge needle returns to zero when not pressurized.

• Wipe adapters and hose after use to remove oil and debris
• Inspect threads and O-rings for damage before each use
• Store in a protective case to prevent impact or bending of the gauge
• Replace any cracked hose or worn adapter to maintain accurate readings

Who this is for: The DAYUAN 17-piece diesel compression tester suits professional technicians, fleet mechanics, and experienced home mechanics who need a versatile, high-range compression gauge and a comprehensive set of adapters. If you work on a variety of diesel cars, trucks, or tractors and require dependable, repeatable cylinder pressure measurements, this kit delivers the tools to diagnose common engine wear and sealing problems quickly and accurately.