---
product_id: 40196558
title: "BT-500 Head Gasket Combustion Leak Test Kit - Made in USA"
brand: "block tester"
price: "€ 81.52"
currency: EUR
in_stock: true
reviews_count: 13
category: "Block Tester"
url: https://www.desertcart.gr/products/40196558-bt-500-head-gasket-combustion-leak-test-kit-made-in
store_origin: GR
region: Greece
---

# All-in-one kit, no extras needed Tests leaks in seconds Made in USA, 45+ years legacy BT-500 Head Gasket Combustion Leak Test Kit - Made in USA

**Brand:** block tester
**Price:** € 81.52
**Availability:** ✅ In Stock

## Summary

> 🔥 Don’t let hidden leaks burn your budget! Detect fast, fix smart. 🇺🇸

## Quick Answers

- **What is this?** BT-500 Head Gasket Combustion Leak Test Kit - Made in USA by block tester
- **How much does it cost?** € 81.52 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/40196558-bt-500-head-gasket-combustion-leak-test-kit-made-in)

## 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

- • **Save Time & Money:** Avoid guesswork and expensive mechanic visits by confidently diagnosing combustion leaks yourself.
- • **Instant Leak Detection:** Fluid color shifts from blue to yellow in seconds, revealing combustion leaks before costly repairs.
- • **Complete Ready-to-Use Kit:** Includes all necessary fluid and tools in a durable storage box—no last-minute trips to the store.
- • **Versatile Diagnostic Power:** Detects leaks from blown head gaskets, cracked heads or blocks, pulled bolts, and warped sealing surfaces.
- • **Trusted American Craftsmanship:** Proudly made in the USA for over 45 years with a limited lifetime warranty—quality you can rely on.

## 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 quickly detects combustion leaks by changing fluid color from blue to yellow, helping identify issues like blown head gaskets and cracked blocks. Compact and easy to use, it saves time and money by empowering users to verify engine health before costly repairs.

## Description

Block Tester BT-500 Combustion Leak Test Kit

Review: Good product easy to use - Block tester is Straight to the point, works great. Save me money time and guess work. My coolant kept rising during the test, so I let the steam in and fluid turned green. Suggest it’s a smaller gasket leak. So I’m removing the blocks to have them checked and resurfaced, and install a new gasket 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.

## Features

- 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
- Comes in a box suitable for tool storage.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B06VVBSFTF |
| Best Sellers Rank | #2,940 in Automotive ( See Top 100 in Automotive ) #66 in Diagnostic, Test & Measurement Tools |
| Brand | Block Tester |
| Color | Black309 |
| Customer Reviews | 4.7 4.7 out of 5 stars (3,509) |
| Date First Available | April 2, 1971 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1 pounds |
| Item dimensions L x W x H | 10 x 3 x 5 inches |
| Item model number | BT-500 |
| Manufacturer | Block Tester |
| Manufacturer Part Number | BT-500 |
| Measurement Type | Pounds |
| Model | BT-512 |
| Power Source | Battery Powered |
| Product Dimensions | 10 x 3 x 5 inches |
| Style | Tragbar |
| UPC | 851989000013 |

## Product Details

- **Brand:** Block Tester
- **Color:** Black309
- **Item Weight:** 16 ounces
- **Power Source:** Battery Powered
- **Style:** Tragbar

## Images

![BT-500 Head Gasket Combustion Leak Test Kit - Made in USA - Image 1](https://m.media-amazon.com/images/I/61OogEXI8AL.jpg)

## 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

### ⭐⭐⭐⭐⭐ Good product easy to use
*by O***N on November 3, 2025*

Block tester is Straight to the point, works great. Save me money time and guess work. My coolant kept rising during the test, so I let the steam in and fluid turned green. Suggest it’s a smaller gasket leak. So I’m removing the blocks to have them checked and resurfaced, and install a new gasket kit.

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Good Quality and it Works as it should.
*by M***. on September 16, 2025*

This worked exactly as it should out o the box. I followed the instructions as stated and had no problems getting this to seal on the top of my coolant reservoir. The color never changed after trying it two-three times and revving the engine while checking. Then just for grins and giggles because I read a lot of reviews that stated the color never changed, I went to the rear of my car and held it up to the exhaust sucked it into the tube and the color immediately changed to green/yellow, so I knew it was working as advertised. I do recommend this product. The quality of the tube is good and works as it should.

## 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

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-02-26*