DAYUAN Diesel Engine Compression Tester Kit 17pcs — 0–70 bar (0–1000 psi), 14in Hose & Multiple Adapters

DAYUAN 17Pcs Diesel Engine Compression Tester is a complete compression diagnostic kit with a 0–70 bar (0–1000 psi) gauge, release valve and nine glow plug plus four injector adapters to measure diesel cylinder pressure accurately.

This compression tester set is built for technicians and DIY mechanics who need a reliable way to check diesel engine health. The kit pairs a heavy-duty pressure gauge with a 35.5 cm (14 in) reinforced hose, quick-release valve and a wide range of adapter fittings that let you test most diesel cars, trucks and agricultural engines without removing injectors unnecessarily.

How does this tester measure cylinder compression reliably?

The DAYUAN gauge covers 0–70 bar (0–1000 psi) to capture the full compression range of diesel engines and features a pressure-release valve for controlled readings. The clear dial and solid construction reduce reading errors, and the 14-inch tube helps reach recessed ports.

• 0–70 bar / 0–1000 psi pressure range for diesel engines
• 35.5 cm (14 in) reinforced hose for flexibility and reach
• integrated release valve for safe pressure bleed-off
• large, easy-to-read analog gauge face with durable casing

Which adapters are included and what engine ports do they fit?

The kit includes nine glow plug adapters and four injector adapters to accommodate a broad set of diesel thread sizes and depths. Each adapter is machined to fit common glow plug and injector thread standards so you can attach the hose securely for an accurate seal.

• Glow plug adapters: M10x1.0 (83mm, 91mm, 102mm, 113mm, 119mm), M10x1.25 (64mm, 135mm), M12x1.25 (47mm), M22x1.5 (118mm)
• Injector adapters: M20x1.5x75mm; M22x1.5x73mm; M24x1.5x88mm; M24x2.0x63mm
• Built-in adapter resetter and shortcut design for faster swaps
• Adapter storage and organization inside the included case

How do I use the compression tester safely and effectively?

To use the kit, remove the glow plug or appropriate injector sealing element, thread on the matching adapter, connect the hose, crank the engine and observe peak pressure on the dial. Always follow engine-specific procedures: disable fuel and ignition as required, and relieve pressure through the valve after the test.

• Disable fuel/ignition per engine manual before testing
• Install correct adapter for a tight, leak-free seal
• Crank engine for consistent number of revolutions and record peak pressure
• Use the release valve to bleed pressure when finished

What diagnostic insight will I get from compression readings?

Compression numbers help you spot worn piston rings, leaking valves or head gasket issues by comparing cylinder-to-cylinder pressure. While absolute values depend on engine design and manufacturer specs, consistent low readings or wide variation between cylinders point to mechanical problems worth further inspection.

• Compare readings across cylinders to find inconsistencies
• Low uniform pressure suggests general wear; isolated low cylinders suggest localized faults
• Use results to decide if more detailed inspections (valve, piston, head) are needed
• Not a substitute for full teardown; use as a diagnostic screening tool

Who is this for: The DAYUAN 17Pcs Diesel Engine Compression Tester suits professional mechanics, fleet technicians and knowledgeable DIYers who maintain diesel cars, light trucks and tractors. It’s ideal for anyone who needs a portable, well-equipped compression kit that covers a wide variety of glow plug and injector threads and delivers repeatable pressure readings for troubleshooting engine performance.