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. Is there excessive crankshaft end play? | 0.055 - 0.265 mm (0.002 - 0.010 in.) | Go to Crankshaft Bearings and Connecting Rod Bearings Removal and Crankshaft Bearings and Connecting Rod Bearings Installation . | Go to Step 4 |
| 4 | Inspect the crankshaft journals. Are the crankshaft journals out-of-round? | Go to Crankshaft Bearings and Connecting Rod Bearings Removal and Crankshaft Bearings and Connecting Rod Bearings Installation . | Go to Step 5 | |
| 5 | Inspect the belt tension. Is there excessive belt tension? | Go to Timing Chain Removal and Timing Chain Installation . | Go to Step 6. | |
| 6 | Inspect the crankshaft pulley. Is the crankshaft pulley loose? | Go to Crankshaft Bearings and Connecting Rod Bearings Removal and Crankshaft Bearings and Connecting Rod Bearings Installation . | System OK |
MAIN BEARING NOISE