Master Your Diesel Diagnostics with Dayuan Precision
Professional-grade compression testing kits designed for Toyota, Mitsubishi, and modern common-rail engines.
Happy Customers
Average Rating
Satisfaction Rate
Made in Britain
Free UK Delivery
Next-day dispatch from our Midlands-based warehouse
2-Year UK Warranty
Full technical support and replacement cover for peace of mind
30-Day Trade Returns
Not right for your workshop? Return it hassle-free
Universal Compatibility
Includes 17+ adaptors for TDI, CDI, and heavy-duty diesel engines
What Our Customers Say
Solid bit of kit. Used it on a Toyota Hilux that was struggling to start in the cold. The M10 adaptor fit perfectly and the gauge confirmed low compression on cylinder 3. Saved me hours of guesswork.
Alistair Graham, Glasgow
Impressive quality for the price. I've used the more expensive Snap-On versions and this Dayuan kit holds its own. The quick-release coupling is very secure and doesn't leak.
Gareth Evans, Cardiff
As an engineering lecturer, I appreciate the calibration accuracy. We tested this against our lab standards and it was within 1% across the scale. Excellent for vocational training.
Dr. Arjan Singh, Birmingham
Good value for money. The case is a bit chunky and the latches are stiff, but the actual tool works exactly as it should. Used it on a Transit van last week with no issues.
Oliver Wright, Bristol
Fast delivery and well packaged. I'm a mobile mechanic and this kit has already paid for itself after three diagnostic jobs. The hose length is perfect for getting around manifolds.
Rebecca Thompson, Leeds
The adaptors are well-machined. My only minor gripe is that the manual could be more detailed for beginners, but any pro will know exactly what to do with it.
David Patel, Leicester
Dayuan Tools
A comprehensive 17-piece diagnostic kit for testing compression on a wide range of diesel vehicles, featuring a high-precision 70 Bar gauge.
Professional Grade Diagnostics
The Dayuan Professional Diesel Compression Test Kit is an essential diagnostic tool for any automotive technician working with diesel engines. Designed to identify worn valves, carbon build-up, and blown head gaskets, this kit provides accurate readings that allow you to diagnose internal engine health without a full teardown.
Wide Vehicle Coverage
Equipped with a vast array of adaptors, this kit is compatible with most diesel engines found in the UK market today, including those from Toyota, Mitsubishi, Ford, VW, and Vauxhall. The set includes both glow plug and injector adaptors to ensure you can access the combustion chamber on nearly any configuration, including common-rail and older indirect injection systems.
Built for the Workshop
Featuring a large, easy-to-read 75mm gauge protected by a heavy-duty rubber bumper, this kit is built to survive the workshop floor. The 400mm high-pressure hose is reinforced for durability and features a quick-release coupling for fast transitions between cylinders. All components are housed in a rugged carrying case, keeping your diagnostic tools organised and protected.
How to Use
- Ensure the engine is at normal operating temperature before starting the test.
- Remove the glow plug or injector from the cylinder to be tested.
- Select the correct adaptor from the kit and screw it into the cylinder head.
- Connect the gauge to the adaptor using the quick-release coupling.
- Crank the engine for several seconds and observe the maximum pressure on the gauge.
- Press the release valve to reset the gauge before moving to the next cylinder.
Trusted by 5,000+ UK Garages & Engineers
Frequently Asked Questions
Founded on the principles of engineering excellence, Dayuan Tools has become a trusted name in workshops across the United Kingdom. We specialise in high-performance diagnostic kits designed to withstand the rigours of daily garage use, from independent MOT centres to large-scale fleet maintenance facilities.
Our commitment to quality is matched only by our dedication to the UK automotive community. We understand that in a busy workshop, time is money; that is why our tools are designed for rapid setup and accurate, first-time readings. Based in the UK, we maintain a comprehensive inventory to ensure our customers never have to wait long for the equipment they need.
Every Dayuan product undergoes rigorous testing to meet British safety and accuracy standards. Whether you are troubleshooting a compression issue on a modern common-rail diesel or maintaining agricultural machinery, Dayuan provides the reliable data you need to get the job done right.
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