Replacing valve seat rings - RA05001042900X(05-2900)
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:
Valve guides examined (05-2845)
Operation no. of operation texts and work units or standard texts and flat rates:
| Valve seat rings (20 and 21) | remove with ring seat turning tool. |
| Operating instructions of tool manufacturer | observe. |
| Basic bore diameter (D1) | measure with internal measuring instrument. |
| Valve seat rings (standard size or repair size) | select according to overlap. |
| If repair size | machine basic bore. |
| If repair size, seat ring bore matching valve seat ring | pay attention to overlap. |
| Valve seat ring | cool with liquid nitrogen and insert with a suitable drift. |
| Valve seats | machine (05-2910) . |
DATA IN MM
| Bore of valve seat ring | Inlet | Exhaust | |
| D1 | cylinder head standard size | 36 H6 | 32 H6 |
| D | valve seat ring standard size | 36.1 to 36.12 | 32.1 to 32.12 |
| Repair size | |||
| D1 | cylinder head repair size | 37.2 H6 | 33.2 H6 |
| D | valve seat ring repair size | 37.3 | 32.3 |
| t | 5.6 to 5.9 | ||
| D2 | 30 | 25.6 | |
COMMERCIALLY AVAILABLE TOOLS
| Cylinder head clamping device | e.g. | Hunger 81375 Munchen Order no. 221.60.000 |
| Ring seat turning tool | e.g. | Hunger 81375 Munchen size 2, order no. 220.03.110 |
| Valve seat turning tool (size 2) | e.g. | Hunger 81375 Munchen Model VDSN 1/45/30 Order no. 236.03.308 |
| Inspection set for valve seats | e.g. | Hunger 81375 Munchen Order no. 216.93.300 |
| Internal measuring instrument (range 35 - 100 mm) | e.g. | Mahr, 73730 Esslingen Order no. 844 N |
| External micrometer (range 25 - 50 mm) | e.g. | Mahr, 73730 Esslingen Order no. 40 S H |