Repairing spark plug threads (1 of 2)- RA01001044070X(01-4070)
WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.
Preceding work:
Cylinder head cover removed (01-0500) .
Operation no. of operation texts and work units or standard texts and flat rates:
| Piston of respective cylinder | position to 20 - 30° BTDC. |
| Grooves (arrows) of combination thread tap (9) of thread tapping unit | pack with grease. |
| Stop ring (10) | pull off, fit on. |
| Combination thread tap (9) | screw into damaged thread. |
| Combination thread tap (9) | guide with guide bush (11) pushed into spark plug recess. |
| Combination thread tap (9) | screw in sufficiently until guide tube (12) touches and is resting against the groove (arrow) on the guide bush (11). |
| Length of HELI-COIL threaded insert (8) Use HELI-COIL insert (8) with 10.2 mm block length. |
check. |
| HELI-COIL threaded insert (8) | insert into fitting tools so that the stud (arrow) of the inset (8) is facing the pre-tensioning cartridge (16). |
| HELI-COIL insert | screw in flush (arrow) into pre-tensioning cartridge (16) using the spindle (13). |
| Fitting tool | fit onto tapped hole. |
| Jacket sleeve (15) | hold tight. |
| Screw-in spindle (13) | turn sufficiently until the stop ring (14) is resting against the jacket sleeve (15).
NOTE:
If jacket sleeve (15) jams tight when screwing in, turn back slightly.
|
| Sleeve (18) | fit over driving stud (arrow). |
| Driving stud (arrow) | fix in place with pliers (17) (serrations (s)). |
| Sleeve (18) | turn to left as far a stop. |
| Pliers (17) | move up and down slightly, break off driving stud (arrow). |
| Degreased caulking tool (6) | screw in and tighten to 25 Nm. |
| Engine | crank with starter (01-0110) to remove any swarf which may have dropped onto the piston crown. |
Special tools