Main Bearing Noise
| 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? | 0.070 - 0.0302 mm (0.0027 - 0.0118 in.) | Go to Crankshaft Disassembly and Assembly . | Go to Step 4 |
| 4 | Inspect the crankshaft journals. Are the crankshaft journals out-of-round? | 0.003 mm (0.0001 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 |
MAIN BEARING NOISE REFERENCE CHART