Lisle 75500 Combustion Leak Detector
Lisle 75500 checks cooling-system vapor for combustion gases using indicating fluid. The described blue-to-yellow color change is the test indication. A positive indication can prompt further engine diagnosis, but the detector does not distinguish a failed head gasket from a cracked head or block by itself.
Specifications and included details
- Combustion leak detector, model 75500.
- Draws vapor through indicating fluid using vehicle vacuum or a hand vacuum pump arrangement.
- Blue indicating fluid is described as changing to yellow when exposed to combustion gases.
Before ordering
Follow the detector and vehicle instructions for test conditions, vapor sampling and fluid handling. Never open a hot pressurized cooling system. Exact pump inventory and fluid volume are not specified; confirm the package if those items are needed.
Product questions and answers
Does a color change identify the exact damaged engine part?
No. It indicates combustion gases in the sampled vapor. Further diagnosis is needed to identify the gasket, head or block fault.
Is this a liquid coolant pressure tester?
No. The described method draws vapor through indicating fluid. A pressure-pump gauge test is not the stated mechanism.
What fluid color change is described?
The details identify blue fluid changing to yellow with combustion-gas exposure. Follow the supplied instructions for valid test interpretation.
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