Expensive engine parts (e.g. cylinder liners) are are removed for overhaul. While they are overhauled an identical part is installed in the engine and in use. When the next part has to be overhauled the first, overhauled part is reinstalled on another unit again.
On the instance removed, running hours counting will stop. On the newly installed instance, running hours counting will restart at it's current value and maintenance activities on this part will become due correspondingly.
Example:
1.The red piston and piston rod that is in use in the engine has to be overhauled after 6000rh. There is a blue piston and rod with 500rh on spare.
2.The red piston and piston rod is removed from the engine and replaced with the blue spare piston and piston rod.
3.The engine runs for 2'000 hours. These hours are added to the running hours of the blue piston and piston rod that are now installed. A new due date for all jobs on the blue piston and rod are calculated. These jobs are shown on "Jobs to do" and "Job overview" screen.
The red piston and rod is now removed and no running hours are counted on it until it is reinstalled on the engine. Past overhauls on it are visible on the "Job history" screen. There is no due date for a future job on this piston and rod anymore. |