Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Mechanical
2010 Volkswagen Routan SSECTION Engine Mechanical
| CONDITION | POSSIBLE CAUSES | CORRECTION |
|---|---|---|
| NOISY VALVES | 1. High or low oil level in crankcase. | 1. Check and correct engine oil level. |
| 2. Thin or diluted oil. | 2. Change oil to correct viscosity. | |
| 3. Thick oil | 3. (a) Change engine oil and filter. | |
| (b) Run engine to operating temperature. | ||
| (c) Change engine oil and filter again. | ||
| 4. Low oil pressure. | 4. Check and correct engine oil pressure problem. | |
| 5. Dirt in hydraulic lifters/lash adjusters. | 5. Replace hydraulic lifters/lash adjusters. | |
| 6. Worn rocker arms. | 6. Inspect oil supply to rocker arms. | |
| 7. Worn hydraulic lifters/lash adjusters. | 7. Replace hydraulic lifters/lash adjusters. | |
| 8. Worn valve guides. | 8. Replace cylinder head assembly. | |
| 9. Excessive runout of valve seats on valve faces. | 9. Grind valve seats and valves. | |
| CONNECTING ROD NOISE | 1. Insufficient oil supply. | 1. Check engine oil level. |
| 2. Low oil pressure. | 2. Check engine oil level. Inspect oil pump relief valve and spring. | |
| 3. Thin or diluted oil. | 3. Change oil to correct viscosity. | |
| 4. Thick oil | 4. (a) Change engine oil and filter. | |
| (b) Run engine to operating temperature. | ||
| (c) Change engine oil and filter again. | ||
| 5. Excessive bearing clearance. | 5. Measure bearings for correct clearance. Repair as necessary. | |
| 6. Connecting rod journal out-of-round. | 6. Replace crankshaft or grind surface. | |
| 7. Misaligned connecting rods. | 7. Replace bent connecting rods. | |
| MAIN BEARING NOISE | 1. Insufficient oil supply. | 1. Check engine oil level. |
| 2. Low oil pressure. | 2. Check engine oil level. Inspect oil pump relief valve and spring. | |
| 3. Thin or diluted oil. | 3. Change oil to correct viscosity. | |
| 4. Thick oil | 4. (a) Change engine oil and filter. | |
| (b) Run engine to operating temperature. | ||
| (c) Change engine oil and filter again. | ||
| 5. Excessive bearing clearance. | 5. Measure bearings for correct clearance. Repair as necessary. | |
| 6. Excessive end play. | 6. Check thrust bearing for wear on flanges. | |
| 7. Crankshaft journal out-of-round or worn. | 7. Replace crankshaft or grind journals. | |
| 8. Loose flywheel or torque converter. | 8. Tighten to correct torque. | |
| OIL PRESSURE DROP | 1. Low oil level. | 1. Check engine oil level. |
| 2. Faulty oil pressure sensor/switch. | 2. Replace oil pressure sensor/switch. | |
| 3. Low oil pressure. | 3. Check oil pressure sensor/switch and main bearing oil clearance. | |
| 4. Clogged oil filter. | 4. Install new oil filter. | |
| 5. Worn parts in oil pump. | 5. Replace worn parts or pump. | |
| 6. Thin or diluted oil. | 6. Change oil to correct viscosity. | |
| 7. Oil pump relief valve stuck. | 7. Remove valve and inspect, clean, or replace. | |
| 8. Oil pump suction tube loose. | 8. Remove oil pan and install new tube or clean, if necessary. | |
| 9. Oil pump cover warped or cracked. | 9. Install new oil pump. | |
| 10. Excessive bearing clearance. | 10. Measure bearings for correct clearance. | |
| OIL LEAKS | 1. Misaligned or deteriorated gaskets. | 1. Replace gaskets. |
| 2. Loose fastener, broken or porous metal part. | 2. Tighten, repair or replace the part. | |
| 3. Misaligned or deteriorated cup or threaded plug. | 3. Replace as necessary. | |
| OIL CONSUMPTION OR SPARK PLUGS FOULED | 1. PCV system malfunction. | 1. Check system and repair as necessary. |
| 2. Worn, scuffed or broken rings. | 2. Hone cylinder bores. Install new rings. | |
| 3. Carbon in oil ring slots. | 3. Install new rings. | |
| 4. Rings fitted too tightly in grooves. | 4. Remove rings and check grooves. If groove is not proper width, replace piston. | |
| 5. Worn valve guides. | 5. Replace cylinder head assembly. | |
| 6. Valve stem seals worn or damaged. | 6. Replace seals. |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.