Testing JDM Engines

When it comes to JDM Engines, The Shaken Law in Japan guarantees only newer vehicles on the Japanese roads. This causes vehicles that are older than three years with low mileage to be sold as a second-hand vehicle for export or to be dismantled for auto components. The Japanese Shanken law is the major reason why JDM engines imported from Japan have very low mileage. Before importing these engines from the Japanese Domestic Market, every engine undergoes a comprehensive test to ensure its quality. Usually, all importers, dealing with these engines will carry out a stringent check on them, known as the Ultra-5 Test. Through this test, the dealer will check the condition of the engine by performing five different tests to ensure its quality. These diverse tests include:

Compression test:

Once the JDM motor is received, the importer will carry out the compression test. This test is intended to gauge the cylinder pressure, by removing the spark plug and connecting a pressure gauge to the engine cylinder. Through a battery starter, the engine is turned on to measure the cylinder pressure to ensure that the difference in cylindrical pressure should not be more than 10%. If the compression test fails, the leak down test is performed to detect the pressure leaks from rings, valves, gaskets, or block.

Leak down test

All JDM engines will undergo a leak down check for leaks between the block and the cylinder head. If the leak is not detected, then the head gasket is checked for any damage. Usually, an exhausted head gasket is the indication of an excessively heated motor, which might be the reason for an imperfect cooling system or faulty thermostat, wrecked radiator hoses, water pump, or faulty radiator. If the leak down test fails, the engine will not be sent for shipment.

Oil pressure test

Appropriate oil pressure in a second-hand JDM motor is the sign of the condition of the Oil Pump. Definitely, a JDM motor will not be shipped with the deprived oil pressure. To measure the oil pressure, dealers will use a dedicated oil pressure gauge and if necessary, they will ship the motor by replacing it with a good oil pump, which has the acceptable oil pressure.

Sludge test

A JDM motor will also be checked for sludge before it is imported. Sludge refers to oil swelled gunk that blocks the passageways. To perform the test, the valve cover of the engine is opened for any possible signs of the accumulation of mud. Usually, a JDM motor will get the mud when its oil is not changed periodically according to the specification. If the engine is accumulated with mud, then the engine will not be considered for shipping.

Overall inspection

This is the final test to ensure the import of the JDM motor. The block of the engine is thoroughly examined for any possible cracks. If the block is not cracked or chipped, then the alternator brackets, AC compressor, power steering pump, etc., are checked. With this, the complete inspection of the engine will end.

Then, all the exterior components of the JDM engines are carefully eliminated from them and all the gaps are properly sealed, and the motor can be washed through steam for delivery.

Source: https://www.jdmenginedepot.com/