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Automotive industry

Leak testing applications in automotive components

Comprehensive guide to leak testing for automotive components. Refer to reference values, recommended methods, and ideal equipment for each application.

TECHNICAL GUIDE

Selection by automotive component

Each component of the vehicle requires different levels of airtightness. This table allows for a quick comparison of the requirements and recommended equipment.

Component / Aplication Leak reference (Criteria) Recommended Method Recommended Equipoment
Leak test for automotive shaft (internal / external)
Technical description
 The automotive axle is a mechanical component responsible for transmitting torque from the differential to the wheels, ensuring the movement of the vehicle. Its integrity is critical to prevent lubricant loss and ensure the proper functioning of the transmission system. 
Also known as
 axle shaft, half-shaft, drive shaft. 
Leak test applications
 leak test for automotive axle, leak test for semi-axle, leak test for axle shaft, tightness test in transmission systems. 
2.5 mL/min Air LS-R902 / LS-R700
Injector leak test
Technical description
 The injector is a device responsible for dosing and atomizing the fuel within the internal combustion engine, ensuring an adequate mixture of air and fuel for efficient combustion. Its proper sealing is critical to prevent leaks, loss of pressure, and failures in engine performance. 
Also known as
 injector, fuel injector, automotive injector, fuel injection system. 
Leak test applications
 leak test for injector, leak test for fuel injector, leak tightness test for fuel injectors, leak test for injection systems, detection of microleaks in automotive injectors. 
0.005～0.4 mL/min Air / Helium LS-R902 / LDS3000AQ
Leak test for intake manifold
Technical description
 The intake manifold is the component responsible for distributing air to the engine cylinders for combustion, ensuring a uniform and efficient mixture. The sealing of this element is critical to prevent pressure losses, uncontrolled air intake, and failures in engine performance. 
Also known as
 Intake manifold.
Leak test applications
 leak test for intake manifold, leak test for intake manifold, tightness test on intake manifold, leak detection in intake systems, leak test for automotive manifold. 
0.5～4 mL/min Air / Helium LS-R902 / LDS3000AQ
Water pump leak test
Technical description
 The water pump is a fundamental component of the engine cooling system, responsible for circulating the coolant through the engine and the radiator to maintain an optimal operating temperature. Its sealing is critical to prevent coolant leaks, overheating, and system failures. 
Also known as
 water pump, cooling pump, engine cooling pump. 
Leak test applications
 leak test for water pump, leak test for water pump, tightness test in cooling systems, leak detection in refrigerant pumps, leak test for automotive cooling systems. 
0.25 mL/min Air / Helium LS-R902 / LDS3000AQ
Air suspension tank leak test
Technical description
 The air suspension tank is a key component in pneumatic suspension systems, responsible for storing compressed air for distribution and control within the system. Its airtightness is critical for maintaining the proper pressure, ensuring driving comfort, and preventing failures in the performance of the suspension system. 
Also known as
 air suspension tank, pneumatic tank, air tank for suspension, air reservoir. 
Leak test applications
 leak test for air suspension tank, leak test for air suspension tank, airtightness test in pneumatic suspension systems, leak detection in air reservoirs, leak test for automotive pneumatic systems. 
1.0×10 -9 Pa・m³/s Helium LDS3000
Leak test for extension housing
Technical description
 The extension housing is a structural part of the transmission responsible for housing and protecting internal components, as well as maintaining the alignment and sealing of the system. Its tightness is essential to prevent lubricant leaks, contamination, and failures in the performance of the transmission. 
Also known as
 extension housing, extension housing, transmission housing, transmission housing. 
Leak test applications
 leak test for extension housing, leak test for extension housing, leak tightness test for transmission housings, leak detection in transmission systems, leak test for transmission housing. 
5 mL/min Air LS-R700 / LS-1866
Leak test for assembled engine
Technical description
 The assembled engine is the complete set of the engine ready for operation, integrating all its main systems such as combustion, lubrication, and cooling. The verification of its tightness is critical for detecting leaks in multiple subsystems, preventing operational failures, and ensuring the performance and efficiency of the engine. 
Also known as
 assembled motor, engine assembly, complete motor, motor set, assembled engine. 
Leak test applications
 leak test for assembled engine, leak test for engine assembly, tightness test for complete engines, leak detection in engine systems, leak test for automotive engine assembly. 
5 mL/min Air LS-R902 / LS-R700
Oil pan leak test
Technical description
 The oil pan is the component responsible for storing the engine's lubricating oil, allowing for proper circulation and heat dissipation. Its sealing is critical to prevent leaks that could lead to loss of lubrication, engine damage, and contamination of the system. 
Also known as
 oil sump, oil pan, oil tray, engine oil reservoir. 
Leak test applications
 leak test for oil pan, leak test for oil pan, tightness test on oil tray, leak test in engine lubrication systems. 
1 mL/min Air LS-R902 / LS-R700
EVAP canister leak test
Technical description
 The EVAP canister is a component of the evaporative emissions control system responsible for capturing and storing fuel vapors from the tank, preventing their release into the atmosphere. Its airtightness is essential to comply with environmental regulations and ensure the proper functioning of the EVAP system. 
Also known as
 EVAP canister, canister EVAP, activated carbon filter, carbon canister, fuel vapor reservoir. 
Leak test applications
 leak test for EVAP canister, leak test for canister EVAP, tightness test on activated carbon filter, leak test in EVAP systems, leak detection in evaporative emissions control. 
10 mL/min Air LS-R902 / LS-R700
Leak test for high-pressure valve
Technical description
 The high-pressure valve is a critical component that regulates and controls the flow of fluids in systems operating under high-pressure conditions, such as fuel, gas, or hydraulic systems. Its proper sealing is essential to prevent dangerous leaks, maintain system efficiency, and comply with industrial and automotive safety standards. 
Also known as
 high pressure valve, high pressure valve, HP valve, elevated pressure valve, valve for pressurized systems. 
Leak test applications
 leak test for high pressure valve, tightness test on high pressure valve, leak detection in HP valves, leak test in high pressure fuel systems, leak tightness test in pressurized gas systems. 
1.0×10 -3 Pa・m³/s Helium LDS3000
Automotive muffler leak test
Technical description
 The muffler is a component of the exhaust system responsible for reducing the noise generated by the engine's combustion gases. In addition to dampening sound, it contributes to the control of gas flow and compliance with environmental regulations. Its airtightness is key to preventing leaks that could affect engine performance and increase pollutant emissions. 
Also known as
 silencer, muffler, exhaust, automotive silencer, tailpipe, exhaust system. 
Leak test applications
 leak test for automotive muffler, leak test for muffler, tightness test in exhaust system, leak detection in muffler, leak test in vehicle exhaust components. 
20 mL/min Air LS-R902 / LS-R700
Leak test for vehicle camera
Technical description
 The vehicle camera is an electronic device used in driver assistance systems, such as rearview cameras, peripheral vision, or ADAS monitoring. It is exposed to adverse environmental conditions such as humidity, dust, and temperature changes, so its sealing is critical to ensure proper functioning and durability. 
Also known as
 vehicle camera, reverse camera, automotive camera, ADAS camera, driver assistance camera. 
Leak test applications
 leak test for vehicle camera, airtightness test in reverse camera, tightness test in automotive chambers, leak detection in ADAS systems, sealing test in automotive electronic devices. 
0.25 mL/min Air LS-R740ZL / LZ-R155
Leak test for automotive connector
Technical description
 The automotive connector is an electrical interface designed to transmit power and signals between different systems of the vehicle, including sensors, actuators, and electronic modules. Its sealing is critical to prevent the entry of moisture, dust, or contaminants that could cause electrical failures or signal loss. 
Also known as
 automotive connector, automotive connector, electrical connector, sealed connector, automotive terminal, vehicle electrical connector. 
Leak test applications
 leak test for automotive connector, tightness test on electrical connector, sealing test on automotive connector, leak detection in sealed connectors, sealing test in automotive electrical systems. 
0.2 mL/min Air LS-R700 / LS-1866
Leak test for cylinder block
Technical description
 The cylinder block is the main structure of the engine where the cylinders, lubrication passages, and cooling channels are housed. It is a critical component that withstands high pressures and temperatures, making its sealing essential to prevent leaks of oil, coolant, or gases that could affect the engine's performance and lifespan. 
Also known as
 cylinder block, cylinder block, engine block, engine block, monoblock, engine block. 
Leak test applications
 leak test for cylinder block, tightness test on cylinder block, leak detection in engine block, leak test on monoblock, leak test in engine lubrication and cooling systems. 
10 mL/min Air LS-1881A / LS-R902
Leak test for cylinder head
Technical description
 The cylinder head is the upper part of the engine responsible for sealing the combustion chamber and housing components such as valves, spark plugs, and injectors. It integrates oil and coolant passages, making its tightness critical to prevent internal or external leaks that could affect compression, cooling, and engine performance. 
Also known as
 cylinder head, cylinder head, engine head, cylinder cover, engine cover. 
Leak test applications
 leak test for cylinder head, tightness test on cylinder head, leak detection in engine head, sealing test on cylinder cover, leak test in oil and coolant passages of the engine. 
2–15 mL/min Air LS-1881A / LS-R902
Leak test for heat exchanger
Technical description
 The heat exchanger is a component designed to transfer thermal energy between two or more fluids without them mixing. It is used in cooling systems and thermal control in automotive and industrial applications. Its tightness is essential to prevent cross-contamination between fluids, loss of thermal efficiency, and system failures. 
Also known as
 heat exchanger, heat exchanger, cooler, thermal radiator, thermal exchanger. 
Leak test applications
 leak test for heat exchanger, tightness test in heat exchanger, leak detection in coolers, leak test in thermal exchangers, leak test in heat transfer systems. 
0.2 mL/min Air / Helium LS-R902 / LDS3000AQ
Fuel tank leak test
Technical description
 The fuel tank is the component responsible for safely storing the vehicle's fuel, whether gasoline or diesel. It is designed to withstand conditions of pressure, vibration, and temperature changes, making its airtightness critical to prevent leaks, evaporative emissions, and safety risks. 
Also known as
 fuel tank, fuel tank, gasoline tank, gasoline tank, fuel depot, automotive tank. 
Leak test applications
 leak test for fuel tank, tightness test on fuel tank, leak detection in gasoline tank, leak test in fuel storage tanks, leak test in EVAP systems and fuel storage. 
0.15 mL/min Air / Helium LS-R902 / LDS3000AQ
Leak test for brake caliper
Technical description
 The brake caliper is a key component of the braking system that applies pressure to the pads to generate friction against the disc and stop the vehicle. It operates using hydraulic pressure, so its sealing is critical to prevent brake fluid leaks that could compromise the safety and performance of the system. 
Also known as
 brake caliper, hydraulic caliper, brake clamp. 
Leak test applications
 Brake caliper leak test, brake caliper leak test, caliper leak detection, hydraulic brake system leak test, automotive brake component leak test. 
0.5 mL/min Air LS-R740SH / LS-R902
Automotive radiator leak test
Technical description
 The radiator is an essential component of the cooling system responsible for dissipating heat from the engine coolant through heat exchange with the air. It operates under varying pressure and temperature conditions, so its airtightness is critical to prevent coolant leaks, overheating, and engine failure. 
Also known as
 radiator, automotive radiator, engine heat exchanger, engine cooler. 
Leak test applications
 Leak testing for automotive radiators, radiator leak testing, radiator leak detection, cooling system leak testing, leak testing for engine heat exchangers. 
1.7×10 -3 Pa・m³/s Helium LDS3000AQ
Leak test for ABS system
Technical description
 The ABS (Anti-lock Braking System) is an active safety system that prevents the wheels from locking up during braking, allowing the driver to maintain control of the vehicle. It incorporates hydraulic and electronic components that operate under pressure, so maintaining a leak-free system is critical to ensuring reliable and safe braking performance. 
Also known as
 ABS system, Anti-lock Braking System, ABS module. 
Leak test applications
 ABS leak test, ABS module leak test, leak detection in anti-lock braking systems, brake system leak test, leak test on hydraulic brake components. 
0.1 mL/min Air LS-R740SS
Leak test for SCR sensor
Technical description
 The SCR sensor is a component of the Selective Catalytic Reduction (SCR) system responsible for monitoring parameters such as NOx emissions and the operation of the exhaust aftertreatment system. It operates under demanding conditions of high temperature and chemical exposure, so its airtightness is essential to prevent malfunctions, incorrect readings, and damage to the emissions system. 
Also known as
 SCR sensor, SCR emissions sensor, NOx sensor, selective catalytic reduction sensor. 
Leak test applications
 Leak testing for SCR sensors, leak testing on SCR sensors, leak detection in NOx sensors, leak testing on automotive sensors, leak testing in emission control systems. 
2.1×10 -4 Pa・m³/s Helium LDS3000

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