The following conditions may produce engine knocks on initial
start-up, but only last a few seconds:
| • | Improper oil viscosity. |
| - | 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 start-ups 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 parts. |
| • | Timing chain tensioner malfunction; Clean, inspect and replace
the timing chain tensioner, if required. |
