Hyundai Santa Cruz (NX4A OB) 2021-2025 Service Manual / Engine Mechanical System / Troubleshooting
Hyundai Santa Cruz: Engine Mechanical System / Troubleshooting
| Probable Cause | Remedy |
| Worn bearings due to shortage orexcessive oil | Replace the crankshaft and bearings as required. |
| Improperly installed flywheel | Repair or replace the flywheel as required. |
| Worn piston rings.(Oil consumption may or may not cause the engine to misfire.) | Inspect compression pressure. Repair or replace as required. |
| Worn crankshaft thrust bearings. | Replace the crankshaft and bearings as required. |
| Hydraulic Valve Clearance Adjustment Unit (HLA) Poor operation (HLA) Internal Oil Pressure Not Formation Causes HLA Pressing | Replace the HLA. |
| Abnormal wear of swing arm (bearing and body) | Replace the swing arm assembly. |
| Probable Cause | Remedy |
| 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. |
| Hydraulic Valve Clearance Adjustment Unit (HLA) Poor operation (HLA) Internal Oil Pressure Not Formation Causes HLA Pressing | Replace the HLA. |
| Abnormal wear of swing arm (bearing and body) | Replace the swing arm assembly. |
| Probable Cause | Remedy | ||||||||
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| Probable Cause | Remedy |
| Worn 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 compression pressure. Repair or replace as required. |
| Probable Cause | Remedy |
| Incorrect oil viscosity. | Refill with the correct viscosity oil. |
| Worn crankshaft thrust bearings. | Inspect the crankshaft thrust bearings. Repair or replace as required. |
| Probable Cause | Remedy |
| Low oil pressure. | Repair or replace as required. |
| Broken valve spring. | Replace the valve spring. |
| wear of swing arm | Replace the swing arm |
| Abnormal wear of swing arm (bearing and body) | Replace the swing arm assembly |
| Stretched or broken timing chain and/or damaged sprocket teeth. | Replace the timing chain and sprockets. |
| Worn timing chain tensioner. | 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 or replace as required. |
| Worn drive belt, idler, tensioner and bearings. | Replace the belt and related parts as required. |
| Probable Cause | Remedy | ||||||
| Low oil pressure | Repair or replace damaged parts as required | ||||||
| Loosened 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. | ||||||
| Loosened, damaged or clogged oil pump screen. | Inspect the oil pump screen. Repair or replace as required. | ||||||
| Excessive piston-to-cylinder bore clearance. | Inspect the piston and cylinder bore. Replace as required. | ||||||
| Excessive piston pin-to-piston 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 or replace as required.
| ||||||
| Excessive crankshaft bearing clearance | Inspect the following components, and repair or replace as required.
| ||||||
| Incorrect piston, piston pin and connecting rod installation. | Verify the piston pins and connecting rods are installed correctly. Repair as required. |
| Probable Cause | Remedy | ||||||
| Low oil pressure | Repair or replace as required. | ||||||
| Excessive connecting rod bearing clearance. | Inspect the following components and repair or replace as required :
| ||||||
| Excessive crankshaft bearing clearance. | Inspect the following components and repair or replace as required :
|
| Probable Cause | Remedy | ||||||
Fluid entering the cylinder
| - Remove the 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 from fuel pressure regulator. | ||||||
| Broken timing chain and/or timing chain sprockets. | Inspect timing chain and sprockets. Repair or replace as required. | ||||||
Foreign material in cylinder
| 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 and repair or replace as required. | ||||||
| Broken crankshaft | Inspect crankshaft. Repair or replace as required. |
Repair procedures
- Compression Pressure Inspection
• If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
1.Start the engine until ...
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