DAYUAN Diesel Engine Compression Tester Kit 17pc — 0–70 bar (0–1000 psi) Gauge & Glow Plug/Injector Adapters

DAYUAN's 17-piece diesel engine compression tester kit is a complete diagnostic set with a 0–70 bar (0–1000 psi) gauge and nine glow-plug plus four injector adapters to measure compression on most diesel engines.

This compact kit gives mechanics and DIYers a reliable way to check cylinder compression without disassembling the engine. The heavy-duty gauge includes a release valve and a 35.5 cm (14") reinforced hose for safe, repeatable readings, while the assortment of adapters covers a wide range of glow plug and injector thread sizes used in cars, trucks and tractors. Everything nests in a molded case so parts stay organized and ready for on-the-road diagnostics.

How do I use this compression tester on a diesel engine?

Using the DAYUAN kit is straightforward: warm the engine to operating temperature, disable fuel and ignition systems, remove the glow plug or injector, fit the correct adapter, and crank the engine to record peak pressure. The built-in release valve lets you safely bleed the hose after each test so you can move to the next cylinder quickly.

• Warm engine to normal temperature for consistent readings
• Select matching adapter for glow plug or injector port
• Attach 35.5 cm hose and crank with starter for peak gauge value
• Open release valve to lower pressure before removing hose

What measurements and accuracy can I expect from the gauge?

The analog dial reads from 0 to 70 bar (0–1000 psi), making it suitable for light and heavy-duty diesel cylinders. The clear face and calibrated increments let you compare cylinders side-by-side to spot weak compression. While not a laboratory instrument, the gauge delivers practical, workshop-grade precision for mechanical diagnosis.

• Range: 0–70 bar / 0–1000 psi for diverse diesel applications
• Visible analog dial with calibrated markings for quick comparison
• Reinforced 35.5 cm hose for safe reach into engine bays
• Release valve for controlled depressurization after tests

Which engines and ports do the adapters fit?

The kit includes nine glow-plug adapters and four injector adapters covering common metric thread sizes found in many diesel vehicles and agricultural machines. That variety means you can test compression on most European and Asian diesel cars, light trucks, and compact tractors without buying extra fittings.

• Glow plug adapters: nine sizes, from M10 and M12 to larger M22 fittings
• Injector adapters: four metric sizes including M20, M22, and M24 variants
• Adapters include varying lengths to match recessed ports and deep threads
• Built-in resetter on select adapters for fast configuration changes

What problems can this tool help diagnose in diesel engines?

Compression testing helps identify worn piston rings, leaking valves, head gasket breaches, and other sealing issues that reduce cylinder pressure. By comparing readings across cylinders, you can isolate problem areas and decide whether further inspection or engine teardown is warranted.

• Detects uneven compression indicating ring or valve wear
• Highlights cylinders with possible head gasket leaks
• Useful for post-repair verification and routine engine health checks
• Simplifies decisions about engine overhaul versus targeted repairs

Who is this for: The DAYUAN 17-piece compression tester is designed for professional mechanics, fleet technicians, and serious DIYers who service diesel cars, pickups and small tractors. If you need a portable, organized kit that covers a wide range of glow plug and injector ports and provides workshop-grade pressure readings, this set offers good value and practical diagnostic capability.