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General - 2.0L Engine: Diagnosis Kia Sportage II

Mechanical 19 illustrations ~684 words

COMPRESSION PRESSURE INSPECTION

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

Scheme 1

Scheme 1: COMPRESSION PRESSURE INSPECTION
Scheme 1: COMPRESSION PRESSURE INSPECTION

Scheme 2

Scheme 2
Scheme 2
  1. Start the engine and allow to warm up to operating temperature (about five minutes). Stop the engine.
  2. Disconnect the ignition coil connectors and the spark plug cables.
  3. Remove the four spark plugs using a 16mm spark plug wrench.
  4. Check the cylinder compression pressure. Insert a compression gauge into the spark plug hole. Fully open the throttle. While cranking the engine, measure the compression pressure. NOTE: Always use a fully charged battery to obtain engine speed of 250rpm or more. Repeat step 1 through 3 for each cylinder. NOTE: This measurement must be done in as short a time as possible. Compression pressure: 1,422kPa (14.5kg/cm 2 , 206psi) (250~400 RPM) Minimum pressure: 1,275kPa (13.0kg/cm 2 , 185psi) Difference between each cylinder: 98kPa (1.0kg/cm 2 , 14psi) or less 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.
  5. Reinstall the spark plugs.
  6. Connect the ignition coil connectors and the spark plug cables.

Scheme 3

Scheme 3: TIMING BELT TENSION ADJUSTMENT
Scheme 3: TIMING BELT TENSION ADJUSTMENT

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Scheme 19

Scheme 19
Scheme 19
  1. Remove the engine cover.
  2. Remove the RH front wheel.
  3. Remove the bolts (B) and RH side cover (A).
  4. Loosen the water pump pulley bolts.
  5. Remove the alternator drive belt. (See CHARGING SYSTEM )
  6. Remove the air conditioner compressor drive belt. (See DRIVE BELT )
  7. Remove the power steering pump drive belt. (See CHECKING POWER STEERING BELT TENSION )
  8. Remove the water pump pulley.
  9. Remove the 4 bolts (B) and timing belt upper cover (A).
  10. Turn the crankshaft pulley, and align its groove with timing mark "T" of the timing belt cover. Check that the timing mark of camshaft sprocket is aligned with the timing mark of cylinder head cover. (No.1 cylinder compression TDC position)
  11. Remove the crankshaft pulley bolt (B) and crankshaft pulley (A).
  12. Remove the 5 bolts (B) and timing belt lower cover (A).
  13. Temporarily loosen the tensioner pulley (A) by center bolt.
  14. Adjust the timing belt tension. Rotate the crankshaft clockwise (view from the front) through angle equivalent to two teeth (18°) of camshaft sprocket (A). Using a hex-wrench, apply tension to the timing belt in the clockwise direction so that there is no slack in the belt on the tension side. Tighten the tensioner bolt. Tightening torque: 42.2 ~ 53.9N.m (4.3 ~ 5.5kgf.m, 31.1 ~ 39.8lb-ft) Recheck the belt tension. When applying about 5 lbs of force, the belt should move no more than 0.16 to 0.24 inch (4 to 6mm).
  15. Turn the crankshaft two turns in the operating direction (clockwise) and realign the crankshaft sprocket and camshaft sprocket timing mark.
  16. Install the timing belt lower cover (A) with bolts (B). Tightening torque: 7.8 ~ 9.8N.m (0.8 ~ 1.0kgf.m, 5.8 ~ 7.2lb-ft)
  17. Install the crankshaft pulley (A) with bolt (B). Tightening torque: 166.7 ~ 176.5N.m (17.0 ~ 18.0kgf.m, 123.0 ~ 130.2lb-ft)
  18. Install the timing belt upper cover (A) with bolts (B). Tightening torque: 7.8 ~ 9.8N.m (0.8 ~ 1.0kgf.m, 5.8 ~ 7.2lb-ft)
  19. Install the water pump pulley.
  20. Install the power steering pump drive belt. (See CHECKING POWER STEERING BELT TENSION )
  21. Install the air conditioner compressor drive belt. (See DRIVE BELT )
  22. Install the alternator drive belt. (See CHARGING SYSTEM )
  23. Install the RH side cover (A) with bolts (B)
  24. Install the RH front wheel. Tightening torque: 88.3 ~ 107.9N.m (9 ~ 11kgf.m, 65.1 ~ 79.6lb-ft)
  25. Install the engine cover (A) with bolts. Tightening torque: 3.9 ~ 5.9N.m ( 0.4 ~ 0.6kgf.m, 2.9 ~ 4.3lb-ft)

TROUBLESHOOTING

SymptomSuspect areaRemedy
Engine misfire with abnormal internal lower engine noises.Loose or improperly installed engine flywheel.Repair or replace the flywheel as required.
Worn piston rings. (Oil consumption may or may not cause the engine to misfire.)Inspect the cylinder for a loss of compression. Repair or replace as required.
Worn crankshaft thrust bearings.Replace the crankshaft and bearings as required.
Engine misfire with abnormal valve train noise.Stuck valves. (Carbon buildup on the valve stem can cause the valve not to close properly.)Repair or replace as required.
Excessive worn or mis-aligned timing chain.Replace the timing chain and sprocket as required.
Worn camshaft lobes.Replace the camshaft and valve lifters.
Engine misfire with coolant consumptionFaulty cylinder head gasket and/or cracking or other damage to the cylinder head and engine block cooling system. Coolant consumption may or may not cause the engine to overheat.Inspect the cylinder head and engine block for damage to the coolant passages and/or a faulty head gasket. Repair or replace as required.
Engine misfire with excessive oil consumptionWorn valves, valve guides and/or valve stem oil seals.Repair or replace as required.
Worn piston rings. (Oil consumption may or may not cause the engine to misfire)Inspect the cylinder for a loss of compression Repair or replace as required.
Engine noise on start-up, but only lasting a few seconds.Incorrect oil viscosity.Drain the oil. Refill with the correct viscosity oil.
Worn crankshaft thrust bearing.Inspect the thrust bearing and crankshaft. Repair or replace as required.
Upper engine noise, regardless of engine speed.Low oil pressure.Repair or replace as required.
Broken valve spring.Replace the valve spring.
Worn or dirty valve lifters.Replace the valve lifters.
Stretched or broken timing chain and/or damaged sprocket teeth.Replace the timing chain and sprockets.
Worn timing chain tensioner, if applicable.Replace the timing chain tensioner as required.
Worn camshaft lobes.Inspect the camshaft lobes. Replace the camshaft and valve lifters as required.
Worn valve guides or valve stems.Inspect the valves and valve guides, then repair as required.
Stuck valves. (Carbon on the valve stem or valve seat may cause the valve to stay open.)Inspect the valves and valve guides, then repair as required.
Lower engine noise, regardless of engine speed.Low oil pressure.Repair or replace damaged components as required.
Loose or damaged flywheel.Repair or replace the flywheel.
Damaged oil pan, contacting the oil pump screen.Inspect the oil pan. Inspect the oil pump screen. Repair or replace as required.
Oil pump screen loose, damaged or restricted.Inspect the oil pump screen. Repair or replace as required.
Excessive piston-to-cylinder bore clearance.Inspect the piston and cylinder bore. Repair as required.
Excessive piston pin-to-bore clearance.Inspect the piston, piston pin and the connecting rod. Repair or replace as required.
Excessive connecting rod bearing clearance.Inspect the following components and repair as required. The connecting rod bearings. The connecting rods. The crankshaft. The crankshaft journal.
Excessive crankshaft bearing clearance.Inspect the following components and repair as required. The crankshaft bearings. The crankshaft journals.
Incorrect piston, piston pin and connecting rod installation.Verify the piston pins and connecting rods are installed correctly. Repair as required.
Engine noise under load.Low oil pressure.Repair or replace as required.
Excessive connecting rod bearing clearance.Inspect the following components and repair as required. The connecting rod bearings. The connecting rods. The crankshaft.
Excessive crankshaft bearing clearance.Inspect the following components and repair as required. The crankshaft bearings. The crankshaft journals. The cylinder block crankshaft bearing bore.
Engine will not crank, (crankshaft will not rotate)Hydraulically locked cylinder. Coolant/antifreeze in cylinder. Oil in cylinder. Fuel in cylinder.Remove spark plugs and check for fluid. Inspect for broken head gasket. Inspect for cracked engine block or cylinder head. Inspect for a sticking fuel injector and/or leaking fuel regulator.
Broken timing chain and/or timing chain gears.Inspect timing chain and gears. Repair as required.
Foreign material in cylinder. Broken valve. Piston material. Foreign material.Inspect cylinder for damaged components and/or foreign materials. Repair or replace as required.
Seized crankshaft or connecting rod bearings.Inspect crankshaft and connecting rod bearing. Repair or replace as required.
Bent or broken connecting rod.Inspect connecting rods. Repair or replace as required.
Broken crankshaft.Inspect crankshaft. Repair or replace as required.

TROUBLESHOOTING

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