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

4.6 4.6 out of 5 stars 2,833 ratings
$36.99 with 8 percent savings
List Price: $39.99

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Brand Block Tester
Item Weight 16 ounces
Item dimensions L x W x H 10 x 3 x 5 inches

About this item

  • Complete Combustion Leak Test Kit - Includes Fluid - Nothing More to Buy
  • When Fluid Turns From BLUE to YELLOW Combustion Leak is Present
  • Tests in seconds for combustion leaks caused by: Blown Head Gasket (BHG) Cracked Head or Block Pulled Bolts or Studs Warped Sealing Surfaces
  • Quality Tool Made in USA for over 45 years with Limited Lifetime Warranty
  • Packaged in OEM white box
› See more product details

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Block Tester BT-500 Combustion Leak Test Kit

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

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

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What's in the box

  • Block Tester BT-500 Combustion Leak Test Kit

    • Product guides and documents

    User Guide (PDF)

    Looking for specific info?

    Customer reviews

    4.6 out of 5 stars
    4.6 out of 5
    2,833 global ratings

    Customers say

    Customers like the quality and ease of use of the electric circuit testing device. They say it works as advertised, the instructions are clear, and the test is quick. They are also satisfied with the value and performance. However, some customers have reported issues with the head gasket. Opinions are mixed on leakage, and appearance.

    AI-generated from the text of customer reviews

    125 customers mention119 positive6 negative

    Customers are satisfied with the quality of the electric circuit testing device. They mention that it works well, is excellent, and does what it's supposed to do. Some say that it helps ease their mind when buying used and saves them a headache.

    "...This product does actually work and saves me a headache! however i do need a new turbo now..." Read more

    "Decent bit of kit. I was impressed by the construction and utility of the tool...." Read more

    "Worked as advertised good product" Read more

    "High quality construction. Arrived quickly on Prime.BACKGROUNDI used it to confirm (?)..." Read more

    83 customers mention83 positive0 negative

    Customers find the electric circuit testing device simple to use, with great instructions and easy-to-understand directions. They also say the test is quick and easy, and the results are accurate.

    "It was easy to use and saved me money to see if it had a head gasket. Save me money not going to a repair shop." Read more

    "...Pretty easy design and comes with instructions. first picture is testing after about 3 minutes and never changed color...." Read more

    "Easy to follow instructions helped me determine that my head gasket wasn't blown and that my issues were elsewhere" Read more

    "...Instructions were clear and it was easy to use...." Read more

    41 customers mention37 positive4 negative

    Customers are satisfied with the performance of the electric circuit testing device. They mention that it is simple to use, produces quick results, and is an inexpensive way to figure out if you have a blown head gasket. Some say that the product is an excellent tool to have in your diagnostic arsenal, and comes in handy when checking out used autos.

    "Decent bit of kit. I was impressed by the construction and utility of the tool...." Read more

    "...Instructions were clear and it was easy to use. It didn't show any combustion gases present so just to make sure that the kit works I sucked in..." Read more

    "...head gasket but it was loosing very little coolant and no smoke from the tail pipe and still running great...." Read more

    "This product is great for detecting any kind of combustion fumes to cooling system leaks...." Read more

    34 customers mention24 positive10 negative

    Customers like the value of the electric circuit testing device. They mention it's well worth the price, easy to use, and saves them money. The chemical is easy to replace and is cheap insurance.

    "It was easy to use and saved me money to see if it had a head gasket. Save me money not going to a repair shop." Read more

    "Decent bit of kit. I was impressed by the construction and utility of the tool...." Read more

    "It's not cheap but much cheaper than going to a mechanic and risking being misdiagnosed by a dishonest one...." Read more

    "...It's very easy to use and really no mess when using it. It will save you money by not having to pay someone to do it for you and to help in the..." Read more

    10 customers mention7 positive3 negative

    Customers like the durability of the electric circuit testing device. They mention it's very durable, reliable, and will last a long time.

    "...Good kit, well built, great price. It's a cheap "second opinion" for sure." Read more

    "Product received quickly, packaged well and seems to be very well made. I was pleasantly surprised at the thickness of the plastic fluid tester...." Read more

    "...stuck in there, or maybe just a bad quality valve, combined with a poor material (rubber) that is already cracking, it makes it a one time use tool...." Read more

    "...Very easy to use, will last you quite a while, shows very clearly by changing color from dark blue to greenish/yellowish if exhaust gases are..." Read more

    31 customers mention13 positive18 negative

    Customers are mixed about the leakage of the electric circuit testing device. Some mention that the juice stayed blue, indicating no head gasket leak. However, others say that it didn't seal well and leaked during use, finding an exhaust leak in the cooling system.

    "...I would describe the combustion leakage as fluttering since there was no white smoke or vapor coming out of the exhaust pipe but there was the..." Read more

    "This is a great product to easily diagnose a potential head gasket leak...." Read more

    "Found a head gasket leak with this.. Did the bars tx recommended by Chris fix.. Tested afterwards and it is sealed up for now" Read more

    "Arrived packed well in a box fluid was not leaking Product worked great even though my even though my head gasket didn’t!..." Read more

    16 customers mention5 positive11 negative

    Customers are mixed about the appearance of the electric circuit testing device. Some mention that it looks good, has visual results, and shows very clearly by changing color from dark. However, others say that it turns greenish-yellow and the liquid does turn yellow when exhaust gas passes through it.

    "...first picture is testing after about 3 minutes and never changed color...." Read more

    "...did a successful test, I was still concerned that the yellow color of the reagent, which is very similar to that of Prestone antifreeze, might be..." Read more

    "Looks good and think will be easy to use, Ihaven't use it yet" Read more

    "...Stayed blue from cooking system, immediate yellow from exhaust" Read more

    25 customers mention3 positive22 negative

    Customers are dissatisfied with the gasket of the electric circuit testing device. They mention that it failed, compromised, and blew. Some say that the box was completely broken and the bottle was leaking.

    "...head and can vouch for the accuracy of this test because the head gasket had failed but only slightly...." Read more

    "...incident due to a leaking radiator, a shop told us that the head gasket was compromised and needed to be replaced costing $3,000...." Read more

    "When I tried it out, it didn't detect a blown head gasket...." Read more

    "...Second time was more obvious and verified bad head gasket." Read more

    Works as its intended to
    5 Stars
    Works as its intended to
    First time using this type of product. Wanted to test to see if my head gasket was blown or if my turbo is instead the culprit. Pretty easy design and comes with instructions. first picture is testing after about 3 minutes and never changed color. so i got curious to see if this product actually works so i tested it on the exhaust fumes coming out of the oil fill cap and sure enough it turned yellow (2nd picture). This product does actually work and saves me a headache! however i do need a new turbo now...
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    Top reviews from the United States

    Donnie
    5.0 out of 5 stars Great Block tester
    Reviewed in the United States on February 29, 2024
    Verified Purchase
    It was easy to use and saved me money to see if it had a head gasket. Save me money not going to a repair shop.
    Helpful
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    Dan
    5.0 out of 5 stars Works as its intended to
    Reviewed in the United States on January 19, 2024
    Verified Purchase
    First time using this type of product. Wanted to test to see if my head gasket was blown or if my turbo is instead the culprit. Pretty easy design and comes with instructions. first picture is testing after about 3 minutes and never changed color. so i got curious to see if this product actually works so i tested it on the exhaust fumes coming out of the oil fill cap and sure enough it turned yellow (2nd picture). This product does actually work and saves me a headache! however i do need a new turbo now...
    Customer image
    Dan
    5.0 out of 5 stars Works as its intended to
    Reviewed in the United States on January 19, 2024
    First time using this type of product. Wanted to test to see if my head gasket was blown or if my turbo is instead the culprit. Pretty easy design and comes with instructions. first picture is testing after about 3 minutes and never changed color. so i got curious to see if this product actually works so i tested it on the exhaust fumes coming out of the oil fill cap and sure enough it turned yellow (2nd picture). This product does actually work and saves me a headache! however i do need a new turbo now...
    Images in this review
    Customer image Customer image
    Customer imageCustomer image
    7 people found this helpful
    Helpful
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    Bill Dutton
    5.0 out of 5 stars Works great!
    Reviewed in the United States on March 8, 2024
    Verified Purchase
    Easy to follow instructions helped me determine that my head gasket wasn't blown and that my issues were elsewhere
    Helpful
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    R. Watkins
    4.0 out of 5 stars Well Constructed and Useful Tool
    Reviewed in the United States on October 5, 2017
    Verified Purchase
    Decent bit of kit. I was impressed by the construction and utility of the tool. It consists of a thick-walled plastic tube capped at both ends by hefty rubber stoppers. A small amount of liquid reagent is added to the tube, which is then pressed into the radiator filler neck. The supplied rubber bulb is then pressed against the top of the tube and pumped slowly several times. This draws gasses from the radiator through a porous metal aerator, which bubbles them into the reagent. After a few pumps, the reagent turns from blue to yellow if hydrocarbons are present. There is a check valve in the bottom cap to prevent the reagent from draining out and another check valve in the bulb to ensure that it draws rather than pumps.

    I successfully used this tool to (unfortunately) confirm that the head gasket of my 2003 Civic was leaking.

    One difficulty I had was that it was easy to accidentally draw coolant into the tube (which ruins the test). I did this twice before finally draining enough coolant from the radiator to have a successful test. The instructions advise removing enough coolant to provide a few inches of gap before beginning the test, but I found that once the car warmed up, the coolant level increased to the point that it was necessary to siphon off even more. A design change that would help here would be to provide a floating ball valve (similar to that in a wet/dry shop vacuum) to prevent liquid from entering the tube. When I finally did a successful test, I was still concerned that the yellow color of the reagent, which is very similar to that of Prestone antifreeze, might be due to contamination from coolant, but I noted that the reagent in the tube was still at its original level (at the "fill line" marked on the tube). Afterwards, I experimented with adding antifreeze directly to reagent and determined that it takes a substantial amount of antifreeze to change the color of the reagent to pure yellow. Nevertheless, a reagent that turns to a different color than antifreeze would be a useful change, if that is chemically possible.

    My only other complaint is that I discovered that, while the top rubber cap is designed to be removed for cleaning, the bottom cap is not. It is attached by an adhesive, but the adhesive is too weak, and the cap can be accidentally removed without much force. After it is removed, it cannot be reattached securely without using more adhesive. This should be corrected by either making the bottom cap removable by design, or by using a strong adhesive that prevents the cap from being removed at all.

    Some other info: there is enough reagent in the supplied bottle to do several tests. According to the instructions, the shelf life of the reagent is about one year. Spent reagent from a positive test (that has turned yellow) cannot be reused, but it is not clear whether there would be any negative effects from reusing the reagent from a negative test.
    69 people found this helpful
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    Amazon Customer
    5.0 out of 5 stars Would buy again
    Reviewed in the United States on April 19, 2024
    Verified Purchase
    Worked as advertised good product
    Helpful
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    Phil
    5.0 out of 5 stars Great minimally invasive approach
    Reviewed in the United States on January 1, 2024
    Verified Purchase
    I suspected there may be a head gasket leak in my truck so I bought this as a preliminary investigative first step. Instructions were clear and it was easy to use. It didn't show any combustion gases present so just to make sure that the kit works I sucked in air from the tail pipe and it very quickly changed color so it definitely does work. It is a nice on-hand tool for quick and accurate results.
    Helpful
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    Mr. Value Conscious
    5.0 out of 5 stars Works better than others!
    Reviewed in the United States on October 25, 2023
    Verified Purchase
    I have a Subaru Outback with a small head gasket leak that a similar but different test kit could NOT detect. Go ahead and spend the extra bucks and get this one because it uses suction to pull the radiator gases THROUGH the test liquid which will then change color if you have a head gasket leak. The other test kit does not use suction and is dependent upon the gases from the radiator pushing past the liquid which just doesn't work. Liquid changed from very blue to a greenish blue but definitely changed colors.

    Update: I remove the cylinder head and can vouch for the accuracy of this test because the head gasket had failed but only slightly. I would describe the combustion leakage as fluttering since there was no white smoke or vapor coming out of the exhaust pipe but there was the symptom of the coolant overflow tank spewing coolant after several hundred miles in a given trip.
    3 people found this helpful
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    Top reviews from other countries

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    hannes pahker
    5.0 out of 5 stars It works
    Reviewed in Canada on May 8, 2024
    Verified Purchase
    This little thing helped me to prove for truck dealership that they should fix my truck engine under warranty. About 40k savings. Makes sense right 😝
    Report
    ENRIQUE MICHELLE FIGUEROA ESQUEDA
    5.0 out of 5 stars De las mejores pruebas de hidrocarburos
    Reviewed in Mexico on November 22, 2022
    Verified Purchase
    A sido magnifico poder contar con esta prueba , ya que nos a evitado tener que quitar la cabeza , y hacer un gasto en vano para nuestro cliente , recomendado
    Report
    Alex
    5.0 out of 5 stars Solid test for head gasket leak
    Reviewed in the United Kingdom on August 22, 2023
    Verified Purchase
    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
    Report
    Maccar
    5.0 out of 5 stars Excellent test kit with fast results
    Reviewed in Australia on December 23, 2023
    Verified Purchase
    You definitely need to reduce the coolant in your radiator or tank as it will suck up fluid once the car is started and the cooling system starts to flow if it is at normal to high levels. Test is very simple to run and gives very quick results.
    Report
    madcowjack
    5.0 out of 5 stars This kit tells you the truth
    Reviewed in Canada on November 5, 2023
    Verified Purchase
    My mechanic told me that my 2004 G35 had a head gasket leak or a cracked head. Just the gasket job was being quoted at $3,000.00 which was out of the question. They had replaced my radiator with a new one but one trip around the block and my car overheated again. I bought this just to make certain and I'm ever so happy I did. When I tested the liquid remained blue. So no carbon monoxide in the cooling system was present. Checked the kit out at the exhaust pipe and instant yellow. Most shops just don't know how to properly burp a G35 3.5 engine after dealing with the cooling system. They only fill up the cooling system with anti-freeze squeeze the rad hoses and look for some air in the system and think it is 'job done'. NOT! Had this same issue with other shops before too. This kit will tell you the real truth prior to you wasting your time and loads of cash. Buy it. Use it.
    5 people found this helpful
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