Cylinder Leak Down Tester Compression Leakage Detector Kit - Neilsen - CT3615
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Product Information
Full details
The Neilsen Cylinder Leak Down Tester is an essential diagnostic tool for automotive technicians and DIY mechanics looking to pinpoint the root cause of engine compression loss in both petrol and diesel vehicles. By pressurizing individual cylinders, it helps identify leaking valves, worn piston rings, or damaged head gaskets; however, users should note that an external compressed air source is required for operation.
All features
| Model Part Number | CT3615 |
|---|---|
| Brand | Neilsen |
Extended Product Information
FAQs
Does this tool work on diesel engines?
Yes, the Neilsen CT3615 is designed to function on both petrol and diesel engines, provided you use the correct adaptor size.
How much air pressure do I need?
The kit is rated for up to 6.8 bar or 100 psi. You should start at a lower pressure and increase as needed to identify the leak.
Can this test a multi-valve engine?
Yes, the kit includes adaptors specifically designed to be compatible with single and multi-valve cylinder head configurations.
Does the kit come with a carrying case?
Yes, the 7-piece kit is typically supplied in a storage case to keep the adaptors and gauge organized.
What if my cylinder is not at Top Dead Center?
Testing while the cylinder is not at TDC will result in inaccurate readings, as the valves will not be fully closed, causing pressure to escape through the ports.
Troubleshooting
Gauge needle does not move when air is connected
Ensure the air compressor is turned on and the regulator is providing at least 10-20 psi; check all hose connections for firm seating.
Adaptor does not fit the cylinder head
Verify the thread size of your engine's spark plug or glow plug and cross-reference with the provided M10-M24 adaptors.
Consistent air leakage detected regardless of cylinder
Check the O-ring seals on the adaptor hose; if the O-ring is cracked or flattened, it may allow air to escape before entering the cylinder.
Pros and Cons
Pros
- Compatible with both petrol and diesel engines
- Extensive range of M10 to M24 adaptors included
- Clear, readable pressure gauge
- Essential for pinpointing specific engine failure points
- Compact 7-piece kit for easy storage
Cons
- Requires an external air compressor to function
- Requires basic mechanical knowledge for accurate interpretation
- Not suitable for engines without standard plug hole access
Setup, Compatibility & Care
Before starting, ensure your air compressor is set to the appropriate pressure rating, not exceeding 100 psi (6.8 bar). Select the correct threaded adaptor (M10, M12, M14, or M18/M24) that matches your vehicle's engine specifications. Always hand-tighten the adaptors into the cylinder head to prevent cross-threading the engine block. After use, disconnect the hoses carefully and store the kit in a dry, clean environment. Wipe down the gauge and adaptors with a clean, lint-free cloth to prevent debris from contaminating the internal valves of the tester. Avoid dropping the gauge, as internal calibration can be affected by shock.