Engine Knocks Cold and Continues for Two-Three Minutes and/or Knock Increases with Engine Torque
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| 1 | Does the engine knock when it is cold and continue for 2-3 minutes or does the knock increase with torque? | - | Go to Step 2 | System OK |
| 2 | Inspect the flywheel. Is the flywheel contacting the splash shield? |
- | Go to Step 3 | Go to Step 4 |
| 3 | Reposition the splash shield. Is the repair complete? |
- | Go to Step 1 | - |
| 4 | Inspect the balancer and the drive pulleys. Is either the balancer or the drive pulleys loose or broken? |
- | Go to Step 5 | Go to Step 6 |
| 5 | Tighten or replace the balancer or the driver pulleys. Is the repair complete? |
- | Go to Step 1 | - |
| 6 | Inspect the piston-to-bore clearance. Is the clearance more than the value specified? |
0.030 mm (0.001 in) | Go to Step 7 | Go to Step 8 |
| 7 |
IMPORTANT:
Cold engine piston knock usually disappears when the cylinder is grounded out. Cold engine piston knock, which disappears in about 1.5 minutes, is considered acceptable.
|
- | Go to Step 1 | - |
| 8 | Inspect the connecting rod. Is the connecting rod bent? |
- | Go to Step 9 | System OK |
| 9 | Replace the connecting rod. Is the repair complete? |
- | Go to Step 1 | - |