Block Tester BT-500 Combustion Leak Test Kit

Q: Can this be used to diagnose an exhaust leak?

While the tool will detect exhaust gases (fluid turns from blue to yellow while squeezing the bulb), it probably wouldn't be able to pinpoint exactly where the leak is coming from. But, it may be useful in ruling out an underhood exhaust leak if you're trying to determine whether or not a particular sound (like ticking) is caused by an exhaust leak or some other mechanical problem.

Q: How do i clean the the tube after use. Does any tester fluid leak into coolent while testing?

You can pop the top cap off and rinse it with water (distilled water if preferred if you have it handy). Tester fluid won't leak down into the coolant as there is a one-way valve in the cone end. Even if test fluid does somehow get into the coolant, there will be no adverse effects.

Q: Can it be use for diesel fuel engine?

Yes, it works on diesel engines. A positive test might show a greenish-yellow color to the fluid rather than the full transition to yellow that you'd see when testing a gasoline engine with a combustion leak.

Q: Does the engine have to be running to work or can we turn the engine over and over to test. will not start, we want to be certain of HG before scrap

I understand your concern. The block Tester detects combustion gases in the coolant system. It will not work if there is no combustion. I would say, if it is igniting the fuel in all cylinders while cranking, but will not remain running it may bleed enough combustion carbons into the coolant system. However, I honestly do not think it will work unless it is running. This block tester is only for head gasket combustion carbon leaks into the coolant system. It is not for head gasket leaks that result in water leaving through the exhaust system. I hope this helps.

Product ID: 316881920

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Details

Brand
Block Tester
Power source
Battery
Style
Tragbar
Colour
Black309
Item weight
1 Pounds

🔬High accuracy ±0.5%

⏱️Tests leaks in seconds

🛠️All-in-one kit, no extras needed

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Block Tester BT-500 Head Gasket Combustion Leak Test Kit - Made in USA

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Description

🛠️ Diagnose like a pro, fix before it’s too late!

INSTANT LEAK DETECTION - Detect combustion leaks in seconds with a simple color change from blue to yellow—no guesswork, just results.
PREVENT COSTLY REPAIRS - Catch combustion leaks early to avoid expensive engine damage and maintain peak vehicle performance.
COMPLETE READY TO USE - Includes all necessary fluid and components in one sleek OEM-packaged kit—no additional purchases required.
PORTABLE PROFESSIONAL - Compact, handheld design fits perfectly in your toolkit for on-the-go diagnostics wherever your job takes you.
PRECISION YOU CAN TRUST - Engineered with ±0.5% measurement accuracy to pinpoint issues like blown head gaskets and cracked blocks effortlessly.

The BT-500 Combustion Leak Test Kit is a portable, battery-free diagnostic tool that detects combustion leaks in seconds by changing fluid color from blue to yellow. With ±0.5% accuracy, it identifies issues such as blown head gaskets, cracked heads, and warped sealing surfaces. Packaged complete with all necessary fluid, this OEM-quality kit is designed for quick, reliable testing without any extra purchases.

Specifications

Manufacturer	Block Tester
Part number	BT-500
Item Weight	454 g
Product Dimensions	25.4 x 7.62 x 12.7 cm; 453.59 g
Item model number	BT-500
Size	SD407
Color	Black309
Style	Tragbar
Power source type	Battery Powered
Item Package Quantity	1
Measurement Accuracy	+/- 0.5%
Included components	Block Tester BT-500 Combustion Leak Test Kit
Batteries Included?	No
Batteries Required?	No

Have a Question? See What Others Asked

Can this be used to diagnose an exhaust leak?

How do i clean the the tube after use. Does any tester fluid leak into coolent while testing?

Can it be use for diesel fuel engine?

Does the engine have to be running to work or can we turn the engine over and over to test. will not start, we want to be certain of HG before scrap

Reviews

M**M

takes some time to change colour (test it on exhaust gas)

cool idea. helps diagnose leaky head gasket. easy to use but the colour change isnt as big as i expected. test it on car exhaust gas if the head tests good to be sure fluid changes

10.02.2022

D**M

Easy use

Good

12.09.2025

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