Noise Diagnosis
WARNING: This page is about a different car, the 2005 Suzuki Reno and 2005 Suzuki Forenza. However, it is still accessible from the selected car via links, so may be relevant.
Main Bearing Noise
MAIN BEARING NOISE - DIAGNOSTIC PROCEDURE
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| 1 | Are dull thuds or knocks heard with every engine revolution? | - | Go to Step 2 | System OK |
| 2 | Check the oil pump pressure. Is the oil pump pressure low? |
- | Go to "OIL PRESSURE TEST :" | Go to Step 3 |
| 3 | Inspect the crankshaft end play. Does the crankshaft end play exceed the specified value? |
0.1 mm (0.0039 in.) | Go to "CRANKSHAFT DISASSEMBLY AND ASSEMBLY :" | Go to Step 4 |
| 4 | Inspect the crankshaft journals. Are the crankshaft journals out-of-round? |
0.004 mm (0.0002 in.) max. | Go to "CRANKSHAFT DISASSEMBLY AND ASSEMBLY :" | Go to Step 5 |
| 5 | Inspect the belt tension. Does the belt tension exceed the specified value? |
- | Go to "TIMING BELT REMOVAL AND INSTALLATION :" | Go to Step 6 |
| 6 | Inspect the crankshaft pulley. Is the crankshaft pulley loose? |
- | Go to "CRANKSHAFT DISASSEMBLY AND ASSEMBLY :" | System OK |
Connecting Rod Bearing Noise Symptom
CONNECTING ROD BEARING NOISE SYMPTOM - DIAGNOSTIC PROCEDURE
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| 1 | Is a knock noise heard under all engine speeds? | - | Go to Step 2 | System OK |
| 2 | Inspect the crankshaft connecting rod journal. Is the crankshaft connecting rod journal worn? |
- | Go to "CRANKSHAFT DISASSEMBLY AND ASSEMBLY :" | Go to Step 3 |
| 3 | Check the oil pump pressure. Is the oil pump pressure low? |
- | Go to "OIL PRESSURE TEST :" | Go to Step 4 |
| 4 | Inspect the crankshaft connecting rod journals. Are the journals out-of-round? |
- | Go to "CRANKSHAFT DISASSEMBLY AND ASSEMBLY :" | Go to Step 5 |
| 5 | Inspect the connecting rods. Is there a misaligned connecting rod? |
- | Go to "PISTONS AND RODS REMOVAL AND INSTALLATION :" | Go to Step 6 |
| 6 | Inspect the connecting rod bolts. Are the connecting rod bolts torqued properly? |
- | System OK | Go to "PISTONS AND RODS REMOVAL AND INSTALLATION :" |
Piston Noises
PISTON NOISES - DIAGNOSTIC PROCEDURE
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| 1 | Are any of the following noises heard: a sharp double knock when the engine is idling, a light ticking with no load on the engine, or a "slapping" noise when the engine is cold? | - | Go to Step 2 | System OK |
| 2 | Inspect the piston pin and the bushing. Is the piston pin or the bushing worn or loose? |
- | Go to "PISTONS AND RODS REMOVAL AND INSTALLATION :" | Go to Step 3 |
| 3 | Inspect the piston. Is the piston broken or cracked? |
- | Go to "PISTONS AND RODS REMOVAL AND INSTALLATION :" | Go to Step 4 |
| 4 | Inspect the connecting rods. Is there a misaligned connecting rod? |
- | Go to "PISTONS AND RODS REMOVAL AND INSTALLATION :" | Go to Step 5 |
| 5 | Inspect the piston position. Is the piston 180° out of position? |
- | Go to "PISTONS AND RODS REMOVAL AND INSTALLATION :" | System OK |
Valve Mechanism or Valve Train Noises
VALVE MECHANISM OR VALVE TRAIN NOISES - DIAGNOSTIC PROCEDURE
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| 1 | Is a light tapping sound heard from the engine? | - | Go to Step 2 | System OK |
| 2 | Inspect the valve springs. Are the springs weak or broken? |
- | Go to "CYLINDER HEAD AND VALVE TRAIN COMPONENTS DISASSEMBLY AND ASSEMBLY :" | Go to Step 3 |
| 3 | Inspect the valves. Are the valves sticking or warped? |
- | Go to "CYLINDER HEAD AND VALVE TRAIN COMPONENTS DISASSEMBLY AND ASSEMBLY :" | Go to Step 4 |
| 4 | Inspect the valve lifters. Are the valve lifters dirty, stuck or worn? |
- | Go to "CYLINDER HEAD AND VALVE TRAIN COMPONENTS DISASSEMBLY AND ASSEMBLY :" | Go to Step 5 |
| 5 | Inspect the camshaft lobes. Are the camshaft lobes damaged or improperly machined? |
- | Go to "CYLINDER HEAD AND VALVE TRAIN COMPONENTS DISASSEMBLY AND ASSEMBLY :" | Go to Step 6 |
| 6 | Check the oil supply to the valve train. Is the oil supply insufficient or poor? |
- | Go to "CYLINDER HEAD AND VALVE TRAIN COMPONENTS DISASSEMBLY AND ASSEMBLY :" | Go to Step 7 |
| 7 | Inspect the valve guides. Are the valve guides worn? |
- | Go to "CYLINDER HEAD AND VALVE TRAIN COMPONENTS DISASSEMBLY AND ASSEMBLY :" | Go to Step 8 |
| 8 | Inspect the valve spring seat. Is the valve spring seat incorrect? |
- | Go to "CYLINDER HEAD AND VALVE TRAIN COMPONENTS DISASSEMBLY AND ASSEMBLY :" | System OK |