--- product_id: 40196558 title: "Combustion Leak Test Kit - Made in USA BT-500" brand: "block tester" price: "¥14694" currency: JPY in_stock: true reviews_count: 13 category: "Block Tester" url: https://www.desertcart.jp/products/40196558-combustion-leak-test-kit-made-in-usa-bt-500 store_origin: JP region: Japan --- # 16 tests per kit Results in seconds Made in USA, 45+ years Combustion Leak Test Kit - Made in USA BT-500 **Brand:** block tester **Price:** ¥14694 **Availability:** ✅ In Stock ## Summary > 🔍 Don’t guess—know your engine’s health in seconds! ## Quick Answers - **What is this?** Combustion Leak Test Kit - Made in USA BT-500 by block tester - **How much does it cost?** ¥14694 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/40196558-combustion-leak-test-kit-made-in-usa-bt-500) ## Best For - block tester enthusiasts ## Why This Product - Trusted block tester brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact & Organized:** Comes in a durable storage box to keep your testing kit neat and protected - • **All-in-One Ready Kit:** Includes fluid and components—no extra purchases needed to start testing - • **Instant Leak Detection:** Fluid changes color from blue to yellow for clear, immediate results - • **Trusted American Craftsmanship:** Manufactured in the USA for over 45 years with a limited lifetime warranty - • **Universal Engine Compatibility:** Works seamlessly with gasoline, diesel, propane, natural gas & alternative fuels ## Overview The BT-500 Head Gasket Combustion Leak Test Kit is a professional-grade, all-inclusive diagnostic tool made in the USA for over 45 years. It delivers instant, easy-to-read results by changing fluid color to detect combustion leaks caused by head gasket failure or engine damage. Compatible with virtually all liquid-cooled internal combustion engines, this kit offers up to 16 precise tests per refill and comes in a convenient storage box, making it the go-to choice for reliable, fast leak detection. ## Description Block Tester BT-500 Combustion Leak Test Kit Review: Used to confirm or question dealer's diagnosis - High quality construction. Arrived quickly on Prime. BACKGROUND I used it to confirm (?) the Honda dealer's diagnosis of "coolant was two quarts low -- seeing bubbles in the radiator -- don't drive it -- must diagnose further." After they saw bubbles, they said the opened up the engine and gave it a leakdown test. All cylinders less than 3%. Then they said they needed to do a "five-gas" test, but didn't have time that evening. They wanted to keep it overnight and do more work on it, but that didn't work for our schedule. I kind of wondered why they didn't do that ten minute long "five-gas" test first before spending an hour tearing into the engine. And I wondered why they didn't just spend the five minutes it takes to use one of these testers. The story was a little fishy, or maybe they were just clumsy and less than highly skilled. Anyway, I didn't trust them 100% at that point, so I needed a second opinion. ENTER THE BLOCK TESTER TOOL Used my tester. Lots of YouTube videos available if you're not familiar. They basically follow the proper directions on the card. Lower the radiator level by 2-3 inches with a turkey baster. Fill the tester. Place tester tightly over the radiator opening and start working the bulb to draw the gases through it for ONE MINUTE. 1) I ran the engine warm. Didn't see bubbles. 2) I took it on the interstate for a while. Didn't see any bubbles. 3) I tried it from dead-cold overnight. Still didn't see any of the bubbles mentioned by the dealer. After each visual test I ran the Block Tester with fresh fluid. Pretty much the fluid stayed imperial royal blue. Fresh fluid for each test. After one of the tests just for fun, I waved it in the exhaust tailpipe plume -- instant translucent hot chrome yellow. So the fluid works, but it just didn't find any combustion gases in the radiator. Also, after one of the tests I kept vigorously pumping for at least another five minutes and it went slightly off of the deep imperial royal blue (almost faintly indigo) toward being still strongly blue but having the slightest hint of aqua. I had some concern. But then I also tested with fresh fluid out in the clean air, and it took again about five minutes of vigorous (spastic?) pumping go get that slightest hint of aqua. Conclusion here, again, is there there were no combustion gases present in the coolant system. I wonder what the Honda mechanic saw? CONCLUSION This tester is awesome. Super easy to use. I would recommend it to friend. Review: Worked great - It worked so well in fact I thought it wasn't working. I pumped and pumped, waited, nothing. I for sure was expecting my issue to be exhaust gasses from a blown gasket. There was not, the fluid didn't detect any. I put the nozzle of the tool near the exhaust, and took 1 pump of the exhaust and it immediately turned yellow. Clear as day. I'm very confident this tool saved me time troubleshooting an issue that didn't exist. I figured out it was a bad radiator cap all along. December 22, 2025. I've since used it on multiple vehicles. And additionally this same jeep I originally bought it for unfortunately. I was getting a misfire on startup in one cylinder that would go away after 10 or so seconds. Figured there's fluid in the cylinders, like coolant. I tested the rad again wjth this tester and well I guess I have a blown gasket now. Going to limp it into spring and do the heads. This is an essential tool for quick diagnostic. ## Features - Complete Combustion Leak Test Kit: Includes fluid and all necessary components with nothing more to buy for immediate testing - Easy Visual Indicator: Fluid turns from blue to yellow when combustion leak is present, providing clear and instant results - Comprehensive Leak Detection: Tests in seconds for combustion leaks caused by blown head gasket, cracked head or block, pulled bolts or studs, and warped sealing surfaces - Quality American Manufacturing: Made in USA for over 45 years with limited lifetime warranty ensuring long-lasting reliability - Convenient Storage Solution: Comes in a box suitable for tool storage to keep your kit organized and protected - Versatile Engine Compatibility: Works with virtually any liquid-cooled internal combustion engine including gasoline, diesel, propane, natural gas and alternative fuel engines with closed cooling systems - Efficient Testing Capacity: Includes enough fluid to conduct 16 tests with large single-chamber design that provides greater accuracy while using less test fluid ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B06VVBSFTF | | Best Sellers Rank | #5,326 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Leak Detection Tools | | Brand | Block Tester | | Customer Reviews | 4.7 4.7 out of 5 stars (3,618) | | Date First Available | April 2, 1971 | | Item Weight | 1 pounds | | Item model number | BT-500 | | Manufacturer | Block Tester | | Manufacturer Part Number | BT-500 | | Model | BT-512 | | Product Dimensions | 10 x 3 x 5 inches | ## Product Details - **Brand:** Block Tester - **Color:** Black309 - **Item Weight:** 16 ounces - **Power Source:** Battery Powered - **Style:** Tragbar ## Images ![Combustion Leak Test Kit - Made in USA BT-500 - Image 1](https://m.media-amazon.com/images/I/61OogEXI8AL.jpg) ![Combustion Leak Test Kit - Made in USA BT-500 - Image 2](https://m.media-amazon.com/images/I/713XI1o5+AL.jpg) ![Combustion Leak Test Kit - Made in USA BT-500 - Image 3](https://m.media-amazon.com/images/I/71Y1C0DtrOL.jpg) ![Combustion Leak Test Kit - Made in USA BT-500 - Image 4](https://m.media-amazon.com/images/I/71QhMSKiMML.jpg) ![Combustion Leak Test Kit - Made in USA BT-500 - Image 5](https://m.media-amazon.com/images/I/61BM6htUDqL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Can this be used to diagnose an exhaust leak?** A: 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?** A: 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?** A: 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** A: 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Used to confirm or question dealer's diagnosis *by M***N on March 20, 2018* High quality construction. Arrived quickly on Prime. BACKGROUND I used it to confirm (?) the Honda dealer's diagnosis of "coolant was two quarts low -- seeing bubbles in the radiator -- don't drive it -- must diagnose further." After they saw bubbles, they said the opened up the engine and gave it a leakdown test. All cylinders less than 3%. Then they said they needed to do a "five-gas" test, but didn't have time that evening. They wanted to keep it overnight and do more work on it, but that didn't work for our schedule. I kind of wondered why they didn't do that ten minute long "five-gas" test first before spending an hour tearing into the engine. And I wondered why they didn't just spend the five minutes it takes to use one of these testers. The story was a little fishy, or maybe they were just clumsy and less than highly skilled. Anyway, I didn't trust them 100% at that point, so I needed a second opinion. ENTER THE BLOCK TESTER TOOL Used my tester. Lots of YouTube videos available if you're not familiar. They basically follow the proper directions on the card. Lower the radiator level by 2-3 inches with a turkey baster. Fill the tester. Place tester tightly over the radiator opening and start working the bulb to draw the gases through it for ONE MINUTE. 1) I ran the engine warm. Didn't see bubbles. 2) I took it on the interstate for a while. Didn't see any bubbles. 3) I tried it from dead-cold overnight. Still didn't see any of the bubbles mentioned by the dealer. After each visual test I ran the Block Tester with fresh fluid. Pretty much the fluid stayed imperial royal blue. Fresh fluid for each test. After one of the tests just for fun, I waved it in the exhaust tailpipe plume -- instant translucent hot chrome yellow. So the fluid works, but it just didn't find any combustion gases in the radiator. Also, after one of the tests I kept vigorously pumping for at least another five minutes and it went slightly off of the deep imperial royal blue (almost faintly indigo) toward being still strongly blue but having the slightest hint of aqua. I had some concern. But then I also tested with fresh fluid out in the clean air, and it took again about five minutes of vigorous (spastic?) pumping go get that slightest hint of aqua. Conclusion here, again, is there there were no combustion gases present in the coolant system. I wonder what the Honda mechanic saw? CONCLUSION This tester is awesome. Super easy to use. I would recommend it to friend. ### ⭐⭐⭐⭐⭐ Worked great *by D***D on September 24, 2024* It worked so well in fact I thought it wasn't working. I pumped and pumped, waited, nothing. I for sure was expecting my issue to be exhaust gasses from a blown gasket. There was not, the fluid didn't detect any. I put the nozzle of the tool near the exhaust, and took 1 pump of the exhaust and it immediately turned yellow. Clear as day. I'm very confident this tool saved me time troubleshooting an issue that didn't exist. I figured out it was a bad radiator cap all along. December 22, 2025. I've since used it on multiple vehicles. And additionally this same jeep I originally bought it for unfortunately. I was getting a misfire on startup in one cylinder that would go away after 10 or so seconds. Figured there's fluid in the cylinders, like coolant. I tested the rad again wjth this tester and well I guess I have a blown gasket now. Going to limp it into spring and do the heads. This is an essential tool for quick diagnostic. ### ⭐⭐⭐⭐⭐ Works! That’s what matters! *by A***A on April 21, 2026* 2002 Dodge Dakota. Worked quick. 💯 recommend. Simple easy to do. ## Frequently Bought Together - Block Tester BT-500 Head Gasket Combustion Leak Test Kit - Made in USA - Bar's Leaks HG-1 HEAD SEAL Blown Head Gasket Repair - K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/40196558-combustion-leak-test-kit-made-in-usa-bt-500](https://www.desertcart.jp/products/40196558-combustion-leak-test-kit-made-in-usa-bt-500) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-01*