Compression Tester Kit - AB Tools - AT460
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Product Information
Full details
The AB Tools AT460 Compression Tester Kit is designed for automotive and small engine repair professionals and DIY enthusiasts. It provides a quick and accurate method to diagnose engine health by measuring cylinder compression, helping identify issues with valves, piston rings, cylinder bores, and head gaskets. A potential caveat is the need for specific spark plug sizes, though adapters are included to cover common ones.
All features
| Model Part Number | AT460 |
|---|---|
| Brand | AB Tools |
Extended Product Information
FAQs
Can this tester be used on diesel engines?
No, this compression tester is specifically designed for petrol (gasoline) engines. Diesel engines have different compression characteristics and typically require a different type of tester.
What is the advantage of having both a rigid and flexible hose?
The rigid stem is useful for easy access in engines with ample space around the spark plug. The flexible hose is essential for reaching spark plugs in confined areas or those located at an angle.
How do I interpret the compression readings?
Compare the readings from each cylinder. They should be relatively close to each other (typically within 10-15% variance). Significantly lower readings in one or more cylinders indicate potential problems like worn piston rings, leaking valves, or a faulty head gasket. Consult your engine's service manual for specific pressure specifications.
What does the 'quick-release pull-down coupler' do?
This feature allows you to easily detach and attach the flexible hose or rigid stem from the main tester unit without needing to unscrew fittings, making switching between components fast and convenient.
How often should I check engine compression?
It's recommended to check engine compression if you notice symptoms like reduced power, rough idling, increased fuel consumption, or difficulty starting. Regular preventative maintenance checks are also beneficial, especially for high-mileage engines.
Does the kit include a battery?
No, this is a mechanical compression tester and does not require a battery. The gauge is purely mechanical.
Troubleshooting
Gauge does not move when cranking the engine
Ensure the adapter is securely seated in the spark plug hole, creating a good seal. Verify that the spark plug from the tested cylinder was removed and that the ignition system is disabled.
Inconsistent or low readings
Check for air leaks around the adapter. Ensure the engine is cranked for enough strokes (4-6) for a stable reading. Verify the engine is at operating temperature and the battery is sufficiently charged for consistent cranking speed.
Adapter does not fit spark plug hole
Try a different adapter from the kit (14mm, 18mm, or universal cone). For very unusual spark plug sizes, alternative adapters may be required.
Pros and Cons
Pros
- Accurately diagnoses common engine issues related to compression.
- Includes multiple adapters for wide compatibility with petrol engines.
- Clear, easy-to-read gauge with dual PSI and KPA scales.
- Both flexible and rigid extension options for difficult-to-reach spark plugs.
- Comes with a durable storage case.
Cons
- Primarily designed for petrol engines, not diesel.
- Requires manual operation, not automated.
- Effectiveness depends on proper adapter sealing.
- May not fit all spark plug configurations without additional adapters (though common sizes are included).
Setup, Compatibility & Care
Setup:
- Ensure the engine is at normal operating temperature.
- Remove the spark plug from the cylinder to be tested.
- Select the appropriate adapter (14mm, 18mm, or universal cone) and attach it securely to the tester's hose or stem.
- Insert the adapter into the spark plug hole, ensuring a tight seal.
- Connect the ignition coil or distributor lead to prevent the engine from starting.
- Crank the engine several times (usually 4-6 compression strokes) while observing the gauge reading.
- Record the reading and repeat for all cylinders.
Compatibility:
This kit is designed for petrol engines and includes adapters for common 14mm and 18mm spark plug sizes. The universal cone adapter provides additional compatibility for other applications. It is suitable for cars, motorcycles, lawnmowers, and boats with petrol engines.
Care:
- After each use, clean any dirt or oil from the gauge, hoses, and adapters.
- Store the tester and its accessories in the provided blow-molded case to protect them from damage and loss.
- Periodically check O-rings and seals for wear and replace if necessary to maintain an airtight seal.