Hyundai i-30: Engine Mechanical System / Repair procedures

Hyundai i30 (PD) 2018-2025 Service Manual / Engine Mechanical System / Repair procedures

Compression Pressure Inspection

•	If there is lack of power, excessive oil consumption or poor fuel economy, measure te compression pressure.

1.	Warm up and stop engine. Allow the engine to warm up to normal operating temperature.

2.	Remove the engine cover. (Refer to Engine and Transaxle Assembly - "Engine Cover")

3.	Remove the ignition coils. (Refer to Engine Electrical System - "Ignition Coil")

4.	Remove the spark plugs. (Refer to Engine Electrical System - "Spark Plug")

Check the cylinder compression pressure.

(1)	Insert a compression gauge into the spark plug hole.

(2)	Fully open throttle.

(3)

While cranking the engine, measure the compression pressure.

•	Always use a fully charged battery to obtain engine speed of 200 rpm or more.

(4)

Repeat step (1) through (3) for each cylinder.

•	This measurement must be done in as short a time as possible.

Compression pressure :

1,128 kPa (11.5 kg/cm², 164.0 psi)

Minimum pressure :

981 kPa (10.0 kg/cm², 142.0 psi)

Difference between each cylinder :

98kPa (1.0kg/cm2, 14psi) or less

(5)

If the cylinder compression in 1 or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat step (1) through (3) for cylinders with low compression.

•	If adding oil helps the compression, it is likely 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 may be leakage past the gasket.

Reinstall the spark plugs.

Tightening torque :

14.7 - 24.5 N.m (1.5 - 2.5 kgf.m, 10.8 - 18.1 lb-ft)

7.	Connect the injector connectors.

Install the ignition coil.

Tightening torque :

9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

9.	Connect the ignition coil connectors.

10.	Some DTC's may exist after the inspection test and may need to be manually cleard with diagnostic tool.

Specifications

Specifications Description Specification Limit General Type In-line, DOHC Number of cylinders 4 Bore 71...

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