Kia Rio: Compression Pressure Inspection - Engine Mechanical System - Kia Rio UB 2012-2019 Service ManualKia Rio: Compression Pressure Inspection


     
If there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
1.
Make sure the oil in the crankcase is of the correct viscosity and at the correct level and that the battery is correctly charged. Operate the vehicle until the engine is at normal operating temperature. Turn the ignition switch to the OFF position.
2.
Remove the engine cover.
3.
Disconnect the injector extension connector (A) and the ignition coil connectors (B).


4.
Remove the ignition coils (A).


5.
Remove the spark plugs.
Using a 16mm plug wrench, remove the 4 spark plugs.
6.
Check the cylinder compression pressure.
(1)
Insert a compression gauge into the spark plug hole.


(2)
Set the throttle plate in the wide-open position.
(3)
While cranking the engine, measure the compression pressure.

     
Always use a fully charged battery to obtain engine speed of 250rpm or more.
(4)
Repeat step 1) through 3) for each cylinder.

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

Compression pressure
Standard : 1225.83 kPa (12.5 kg/cm², 177.79 psi) (200 ~ 250 rpm)
Minimum : 1078.73 kPa (11.0 kg/cm², 156.46 psi)
Difference between each cylinder :
98kPa (1.0kg/cm², 14psi) or less

(5)
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.
A.
If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
B.
If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage past the gasket.
7.
Install the spark plugs.

Tightening torque :
7.8 ~ 9.8N.m (0.8 ~ 1.0kgf.m, 5.8 ~ 7.2lb-ft)

8.
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 injector extension connector and the ignition coil connectors.
10.
Install the engine cover.
Specifications
Description Specifications Limit General Type In-line, DOHC   Number of cylinders 4   ...

Troubleshooting
Symptom Suspect area Remedy Engine misfire with abnormal internal lower engine noises. Loose or improperly installed engine flywheel. Repair or replace ...

See also:

Circuit Diagram
(M/T) (A/T) ...

Compressor Installation
1. Make sure of the length of compressor mounting bolts, and then tighten it with the specified tightening order. Tightening torque : ...

Removal
1. Remove the cyliner head cover. (Refer to Timing System) 2. Remove the timing chain cover. (Refer to Timing System) ...

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