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.

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.

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.

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.

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🔧 Don’t guess—test fast and stay ahead of engine trouble!

ALL INCLUSIVE KIT - Comes complete with fluid—no extra purchases needed to start testing immediately.
COMPACT PORTABLE - Lightweight and OEM-packaged for easy storage and professional use on the go.
RAPID LEAK DETECTION - Detect combustion leaks in seconds to avoid costly engine damage.
VERSATILE DIAGNOSTICS - Identifies issues from blown head gaskets to warped sealing surfaces with precision.
CLEAR VISUAL INDICATOR - Fluid changes from blue to yellow, providing an unmistakable sign of leaks.

The BT-500 Combustion Leak Test Kit offers a professional-grade, all-in-one solution for quickly detecting combustion leaks caused by blown head gaskets, cracked heads, or warped surfaces. Featuring a fluid that changes color from blue to yellow upon leak detection, this compact and lightweight kit delivers instant, reliable results—empowering managers and mechanics alike to prevent costly repairs with confidence.

Reviews

A**R

Diagnosed Head Gasket Failure

Worked exactly as expected. well worth the money. Diagnosed head gasket failure. 100% would recommend over cheaper alternatives

8.08.2024

R**S

Class product

Great product best brand on the market when it comes to testing head gaskets

29.05.2025

J**N

Works for peace of mind

I had been told by a mechanic that my Rolls Royce needed head gaskets at a cost of between £6000-£8000. I bought this and tested myself and it has proven the mechanic wrong and given me peace of mind. Well worth buying and checking yourself before spending loads of money!

18.08.2024

S**S

Does what it says

The media could not be loaded. Does what it says... Liquid colour changes from blue to yellow if exhaust gases are detected in the coolant... Cant arque with thst

12.04.2021

A**X

Solid test for head gasket leak

Very nice test, quick and easy to use, I confirmed a head gasket issue, the fluid went from blue to yellow. Highly recommend if you want to diagnose the head gasket issue. Quality product

22.08.2023

A**E

Great product and easy to use.

Used it to test a few cars already.Easy to use and good value.Saves you a lot of money.This product is displayed in my videos on my Channel called AlexTheGrumpyOne.Feel free to find many products and reviews on there.Always happy to give a good honest review.

8.06.2023

A**R

Head gasket tester

Worked well got instant results the liquid changed color

18.02.2025

A**R

A true must have for any motor enthusiast

A real time garage essential

18.08.2024

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TrustScore 4.5 | 7,300+ reviews

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Manufacturer	Block Tester
Brand	Block Tester
Model	BT-512
Product Dimensions	25.4 x 7.62 x 12.7 cm; 453.59 g
Item model number	BT-500
Manufacturer part number	BT-500
Item Weight	454 g

Block Tester BT-500 Combustion Leak Test Kit

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