Hyundai Genesis: General Information / Compression Test

Compression Pressure
In case of lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
Warm up engine until the normal operating temperature (80~95°C(176-203°F)).
Remove the surge tank.
(Refer to Intake And Exhaust System - "Surge Tank")
Remove the LH/RH ignition coils and connectors.
(Refer to Engine Electrical System - "Ignition Coil")
Using the plug wrench (16mm), remove all the six spark plugs.
(Refer to Engine Electrical System - "Spark Plug")
Check cylinder compression pressure.
Insert a compression gauge into the spark plug hole.
Fully open the throttle.
Crank the engine over 7 times to measure compression pressure.
Always use a fully charged battery to obtain engine speed of 250 rpm or more.
Repeat step 1) though 3) for each cylinder.
This measurement must be done in as short a time as possible.

Compression pressure :
1,029 kPa (10.5 kgf/cm?, 149 psi) (250 ~ 400 rpm)
Minimum pressure :
882 kPa (9.0 kgf/cm?, 128 psi)
Difference between each cylinder :
98 kPa (1.0 kg/cm?, 14 psi) or less

If the cylinder compression in one 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 rise, 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 a gas leak through the gasket.
Low compression pressure in two adjacent cylinders may indicate that the head gasket is damaged.
Reinstall the spark plugs.
Install the ignition coils and ignition connectors.
Install the surge tank.
(Refer to Intake And Exhaust System - "Surge Tank")
Specifications DescriptionSpecificationsLimitGeneralTypeV-type, DOHC?Number of cylinders6?Bore96mm (3.7795 in.)?Stroke87mm (3.4252 in.)?Total displacement 3,778cc (230.55 cu.In.)?Compression rati ...

Troubleshooting SymptomSuspect areaRemedyEngine misfire with abnormal internal lower engine noises.Oil short or oil plethora bearing wearLoose or damaged engine drive plate.Replace the crankshaft ...

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