The following conditions may produce engine knocks on initial
startup, but only last a few seconds:
| - | Install proper oil viscosity for expected temperatures. |
| - | Refer to Maintenance and Lubrication. |
| • | Hydraulic lifter bleed down |
| - | Clean, test and replace hydraulic lifter, as necessary. |
| - | When the engine is off, some valves will open. Spring pressure
against the lifters will tend to bleed the lifter down. Repair the lifter
only if the problem is consistent. |
| - | Engines operated for only short periods between startups may have
lifter noise that lasts for a few minutes. This is a normal condition. |
| • | Excessive crankshaft end clearance--replace the crankshaft
thrust bearing. |
| • | Excessive front main bearing clearance--replace the worn
components. |
| • | Timing chain tensioner malfunction--clean and inspect the
timing chain tensioner. Replace the timing chain tensioner, if required. |
