Hyundai Tucson: Repair procedures
Compession Pressure Inspection
WARNING
If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
- Start the engine and turn the coolant temperature to 80 - 95 ºC and stop.
- Remove the engine cover.
(Refer to Engine and Transaxle Assembly - "Engine Cover")
- Remove the ignition coils.
(Refer to Engine Electical System - "Ignition Coil")
- Remove spark plugs.
(Refer to Engine Electrical System - "Spark Plug")
- Disconnect the injector connector (A).
- Check the cylinder compression pressure.
(1) Insert a compression gauge into the spark plug hole.
(2) Fully open the throttle valve.
(3) While cranking the engine, measure the compression pressure.
WARNING
Always use a fully charged battery to obtain engine speed of 200 rpm or more.
(4) Repeat steps (1) through (3) for each cylinder.
WARNING
If you need to check the compression pressure for more than three times, restart the engine to restore the lubrication condition to be normal and then check the compression pressure again.
Compression pressure
Standard : 1,127.76 kPa (11.5 kgf/cm², 164 psi) (200-250 rpm)
Minimum : 980.66 kPa (10.0 kgf/cm², 142 psi)
Difference between each cylinder : 98 kPa (1.0 kgf/cm², 14 psi) 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 steps (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.
- Connect the injector connector (A).
- Install the spark plugs.
(Refer to Engine Electrical System - "Spark Plug")
- Install the ignition coil.
(Refer to Engine Electical System - "Ignition Coil")
- Some DTCs may exist after the inspection test and may need to be manually cleared with diagnostic tool.
- Install the engine cover.
(Refer to Engine and Transaxle Assembly - "Engine Cover")
READ NEXT:
Timing System - Replacement
Components
Variable force solenoid valves
Timing chain cover
Cam to cam guide
Timing chain
Timing chain tensioner arm
Timing chain tensioner arm
Timing chain tensioner
Crankshaft sprocket
Oil pump chain
Oil pump chain tensio
Timing System - Installation
Keep the liquid gasket sealing surfaces (timing chain cover, cylinder
head, cam carrier, cylinder block, lower
crankcase) free from foreign matters, cured sealant, oil, dust, moisture and
etc. Spray the cleaner on the sealing
surface and
SEE MORE:
Heater Pipe
Disconnect the battery negative terminal.
Remove the engine cover.
(Refer to Engine and Transaxle Assembly - "Engine Cover")
Remove the engine room under cover.
(Refer to Engine and Transaxle Assembly - "Engine Room Unde
Interior Antenna
Interior 1 Antenna
Take care not to scratch the crash pad and related parts.
Disconnect the negative (-) battery terminal.
Remove the ecall unit.
(Refer to Emergency Call system - "Emergency Call (eCall) Unit")
Remove the inter
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- Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual
