4.
Install the compression pressure gauge and adapter.
First of all check battery condition and starter for accurate inspection result.
If irregular compression pressure (irregular engine rpm) is displayed or engine cranking sound is abnormal in the vehicle that has engine hesitation or hard starting symptom, Inspect the engine compression pressure by using compression pressure gauge.
IG S/W 'OFF', ENGINE 'OFF'
Remove the main relay (engine control relay) to prevent engine starting from cranking.
Remove the injetor.
Refer to 'Remove and install the injector' of detail inspections (Equipment settings).
Install the compression pressure gauge and adapter.
Block the common rail with plug (CRT-1022) for preventing fuel injection through high pressure pipe.
Refer to 'CRT-1000 Tester composition' of detail inspections (Equipment settings).
Throttle flap must be open while engine cranking and remove the air cleaner if necessary.
☞ There should be NO intake resistance.
While cranking the engine, measure the maximum compression pressure.
☞ Report the number of engine cranking and compare with normal cylinder. (Generally, the number of engine cranking for maximum compression pressure is below 10 times cranking.)
☞ Compression pressure should be inspected at normal operating temperature 80 ~ 95 ℃.
☞ According to inspection condition, The compression pressure and the number of engine cranking for maximum compression pressure can be changed.
■ Specification : 27Kg/㎠ ± 10% (The number of cranking is below 10 times.)
(The variation of the compression pressure of cylinders < 10 %)
Symptom | Inspection procedure | |
Case1 | ● Compression pressure is low at certain cylinder. | ● Pour a small amount of engine oil into the cylinder through the spark plug hole and repeat steps. ● If adding oil helps the compression, it is like that the piston rings and/or cylinder bore are worn or damaged. ● If pressure stays low, a valve may be sticking or seating is improper, or there maybe leakage past the gasket. |
Case2 | ● Compression pressure of all cylinders is low. | ● Go to 'Engine timing belt alignment inspection' procedure. |
