Lisle 75500 Combustion Leak Detector - Automotive Diagnostic Tool

For a gasoline engine cooling system. May work with diesel, but I doubt it, since I believe that diesels put out less hydrocarbons. I think this company makes a diesel version of this kit. Make sure the cooling system is full, install this glass globe on the radiator opening/surge tank opening, fill with the magic mystery fluid, and connect it to a vacuum source. (Either to engine vacuum, or use a mity-vac style vacuum gun.) If there is a crack around the combustion cylinder, or a faulty head gasket, then you should see the magic mystery fluid change colour. This is just another quick way to check for combustion leaks. Other methods may be performing a cooling system pressure test, and checking for coolant on top of the pistons. Or, install a pressure test gauge on the cooling system, keep it at zero PSI, and run the engine. A bad head gasket may push pressure into the cooling system, and make the pressure gauge needle jump up. Or, perform a cylinder compression test.

Funciona bien , hay que tener cuidado de no contaminar la muestra con anticongelante.

Used this to confirm what was pretty certain, a head gasket leak. Sure takes the guesswork and time out of detecting head gasket leaks. I was already 95% certain one or both head gaskets were leaking using cylinder compression and leakdown tests and radiator pressure test. I like the ability to shutdown a cylinder bank and test for a leaking head gasket on one head or the other. Caution, if you do this, you will most certainly trip computer codes and the engine service light on the dash. You need to be aware that you have to check that your code reader (if you have one) will reset the engine service light. Not all will. Many will clear codes but not reset engine service light so you may have to got to a shop to have light reset. Some car models can be manually reset or there is some trick to reset. One of the other anecdotal aspects of this test is that you can tell which cylinder bank is leaking faster or slower. The color change for my testing was gradual, ie it went from blue to green to yellow. This shows that the color change is relatively proportional to the amount and rate of leakage. The color change for the right bank was pretty quick and the color change for the left bank took several minutes. I ran this several times on both a hot and cold engine. The results were generally reproducible.

Works good

NIASE MASTER TECH REVIEW Good value4 professionals. Purchased this item after a once over. I found it effective w/1 caveat. Be careful not 2allow fluids2 enter the intake during testing. This could result in a catastrophic fluid lock of any effected cylinder. In my case the blue color was already rapidly fading when a large bubble erupted directly into the cylinder pushing the test reagent &a considerable column of water up toward the top& out into the intake! I promptly shut the engine down2 avoid damage. BTW, if u c bubbles in the coolant reservoir, creamy white discharge on the engine oil dipstick or the same in the coolant; then u don't need the comfirmation granted by this kit. Any 1or all of the3 ARE comfirmation of a blown head gasket, or of a cracked head, or of a cracked engine block.