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HOMESERVICE MANUALSJEEP2014GRAND CHEROKEE LAREDO, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 2 (5.7L ENGINE (SERVICE INFORMATION))DIAGNOSIS AND TESTINGMECHANICAL
2014 Jeep Grand Cherokee Laredo, AWD

Diagnosis And Testing: Mechanical

2014 Jeep Grand Cherokee Laredo, AWDSECTION Mechanical
WARNING: This page is about a different variant/trim than selected.
ENGINE MECHANICAL DIAGNOSIS CHART

CONDITION POSSIBLE CAUSES CORRECTION
ENGINE NOISE 1. Worn accessory drive belt 1. Check for damage and/or alignment.
Refer to BELT, SERPENTINE, DIAGNOSIS AND TESTING .
2. Worn coolant pump 2. Check for possible coolant leak. If ok, Check the pulley and input shaft for wear. Replace as necessary.
3. Worn generator 3. Check the pulley for wear. Spin the armature. Replace as necessary.
4. Idler/Tensioner pulley 4. Check pulleys. Verify bearing noise. Replace as necessary.
5. Power steering pump 5. Check the pulley and input shaft for wear. Replace as necessary.
6. Flywheel/Flexplate 6. Check for wear or possible cracking. Check bolts. repair as necessary.
NOISY VALVES/LIFTERS 1. High or low oil level in crankcase. 1. Check for correct oil level. Adjust the oil level by draining or adding as needed. Refer to OIL - STANDARD PROCEDURE  .
2. Thin or diluted oil. 2. Change the engine oil. Refer to OIL - STANDARD PROCEDURE  .
3. Low oil pressure. 3. Check the engine oil level. If ok, Perform oil pressure test. Refer to LUBRICATION - DIAGNOSIS AND TESTING  .
4. Debris in tappets/lash adjusters. 4. Clean and/or replace the hydraulic tappets/lash adjusters. Refer to LIFTER(S), HYDRAULIC, ROLLER - DIAGNOSIS AND TESTING  .
5. Bent push rod(s). 5. Install new push rods. Refer to SPRING(S), VALVE, REMOVAL, 5.7L  .
6. Worn rocker arms 6. Inspect the oil supply to the rocker arms and replace worn rocker arms as needed. Refer to ROCKER ARM, VALVE, REMOVAL, 5.7L  .
7. Worn tappets/lash adjusters. 7. Install new hydraulic tappets/lash adjusters. Refer to LIFTER(S), HYDRAULIC, ROLLER, REMOVAL, 5.7L  .
8. Worn valve guides. 8. Inspect the valve guides for wear, cracks or looseness. If either condition exist, replace the cylinder head.
9. Excessive runout of valve seats or valve faces. 9. Grind the valves and seats. Refer to VALVES, INTAKE AND EXHAUST - STANDARD PROCEDURE  .
CONNECTING ROD NOISE 1. Insufficient oil supply. 1. Check the engine oil level.
2. Low oil pressure. 2. Check the engine oil level. If ok, Perform the engine oil pressure test. Refer to LUBRICATION - DIAGNOSIS AND TESTING  .
3. Thin or diluted oil. 3. Change the engine oil to correct the viscosity. Refer to OIL - STANDARD PROCEDURE  .
4. Excessive connecting rod bearing clearance. 4. Measure the bearings for correct clearance with plasti-gage. Repair as necessary.
5. Connecting rod journal out of round. 5. Replace the crankshaft. Refer to CRANKSHAFT, REMOVAL, 5.7L  .
6. Misaligned connecting rods. 6. Replace the bent connecting rods. Refer to SPRING(S), VALVE, REMOVAL, 5.7L  .
MAIN BEARING NOISE 1. Insufficient oil supply. 1. Check the engine oil level.
2. Low oil pressure. 2. Check the engine oil level. If ok, Perform the engine oil pressure test. Refer to LUBRICATION - DIAGNOSIS AND TESTING  .
3. Thin or diluted oil. 3. Change the engine oil to correct viscosity. Refer to OIL - STANDARD PROCEDURE  .
4. Excessive main bearing clearance. 4. Measure the bearings for correct clearance with plasti-gage. Repair as necessary.
5. Excessive end play. 5. Check the crankshaft thrust bearing for excessive wear on flanges. Refer to CAMSHAFT, ENGINE - INSPECTION  .
6. Crankshaft main journal out of round or worn. 6. Replace the crankshaft. Refer to CRANKSHAFT, REMOVAL, 5.7L  .
7. Loose flywheel or torque converter. 7. Inspect the crankshaft, flexplate/flywheel and bolts for damage. Tighten to correct torque.
LOW OIL PRESSURE 1. Low oil level. 1. Check the oil level and fill if necessary.
2. Faulty oil pressure sending unit. 2. Install a new sending unit.
3. Clogged oil filter. 3. Install a new oil filter. Refer to FILTER, ENGINE OIL, REMOVAL, 5.7L  .
4. Worn oil pump. 4. Replace the oil pump assembly. Refer to PUMP, ENGINE OIL, REMOVAL, 5.7L  .
5. Thin or diluted oil. 5. Change the engine oil to correct viscosity. Refer to OIL - STANDARD PROCEDURE  .
6. Excessive bearing clearance. 6. Measure the bearings for correct clearance with plasti-gage. Repair as necessary.
7. Oil pump relief valve stuck. 7. The oil pump pressure relief valve and spring should not be removed from the oil pump. If these components are disassembled and or removed from the pump the entire oil pump assembly must be replaced. Refer to PUMP, ENGINE OIL, REMOVAL, 5.7L  .
8. Oil pickup tube loose, broken, bent or clogged. 8. Inspect the oil pickup tube and pump, and clean or replace as necessary. Refer to PAN, OIL, REMOVAL, 5.7L  .
9. Oil pump cover warped or cracked. 9. Install a new oil pump. Refer to PUMP, ENGINE OIL, REMOVAL, 5.7L  .
OIL LEAKS 1. Misaligned or deteriorated gaskets. 1. Replace gasket.
2. Loose fastener, broken or porous metal part. 2. Tighten, repair or replace the part.
3. Front or rear crankshaft oil seal leaking. 3. Replace the front seal or rear seal. Refer to SEAL, CRANKSHAFT OIL, FRONT, REMOVAL, 5.7L  or RETAINER, CRANKSHAFT REAR OIL SEAL, REMOVAL, 5.7L  .
4. Leaking oil gallery plug or cup plug. 4. Remove and reseal threaded plug.
Replace the cup style plug.
EXCESSIVE OIL CONSUMPTION OR SPARK PLUGS OIL FOULED 1. CCV System malfunction. 1. Check for correct operation. Refer to DESCRIPTION .
2. Defective valve stem seal(s). 2. Repair or replace the seal(s). Refer to SPRING(S), VALVE, REMOVAL, 5.7L  .
3. Worn or broken piston rings. 3. Hone the cylinder bores and Install new rings. Refer to ROD, PISTON AND CONNECTING, REMOVAL, 5.7L  .
4. Scuffed pistons/cylinder walls. 4. Hone the cylinder bores and replace pistons as required. Refer to ROD, PISTON AND CONNECTING, REMOVAL, 5.7L  .
5. Carbon in oil control ring groove. 5. Remove the rings and de-carbon the piston. Refer to RING(S), PISTON - STANDARD PROCEDURE  .
6. Worn valve guides. 6. Inspect the valve guides for wear, cracks or looseness. If either condition exist, replace the cylinder head.
7. Piston rings fitted too tightly in grooves. 7. Remove the rings and check the ring end gap and side clearance. Replace if necessary. Refer to RING(S), PISTON - STANDARD PROCEDURE  .

Lifter Purge Guideline

  1. Warm engine to standard idle conditions.
    NOTE:

    Engine noise may be in the form of a clicking, chatter, or clattering noise.

  2. Listen to the engine for 30 to 60 seconds with the hood up and the engine cover removed.
  3. If noise is present, de-aeration of the lifters is required.
  4. Run the engine between 2000 and 3000 RPM for three to five minutes.
  5. Return the engine to standard idle speed for 30 to 60 seconds.
  6. Evaluate noise. If noise is present, repeat the run an additional 4 cycles.
    NOTE:

    The standard drive cycle will be about 10 - 15 miles of non- stop, combined highway and city driving.

  7. If noise is present, take the vehicle on a standard drive cycle.
    NOTE:

    Use a feeler gauge to verify clearance is present between the lifter and cam base circle.

  8. Evaluate the noise. If noise present, follow standard service procedure for lifter repairs or noise conditions.
  9. Evaluate lifters for sponginess, check valve defects, and clearance.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.