Inspecting Cylinders With Inspection Lamp (Borescope)

NOTE: Numbers in parentheses ( ) indicate a component or tool in the associated illustration.

1. Remove glow plugs
2. Remove prechamber
3. Set piston of cylinder to be inspected to BDC
- If necessary, rotate engine at crankshaft
4. Connect cylinder inspection light (05) and insert inspection probe (06) of the inspection light
5. Withdraw ignition key
- To avoid starter being operated inadvertently
6. Examine cylinder wall
- Distinguish between "optical streaks" and "fretting streaks".
a. "Optical streaks" are usually streaks up to 3 mm in width which are not roughened (e.g. from the ring gap) and therefore do not represent a problem. The traces of honing are still visible.
b. In the case of "fretting streaks" (cylinder wear) the cylinder wall is roughened and the traces of honing are no longer visible.
- In cases of doubt, remove cylinder head, refer to Removal.
7. Performing inspection of the other cylinders as required
8. Install in the reverse order