Checking, correcting setting of TDC sensor - RA03001043450X(03-3450)
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:
Viscous fan shroud removed (20-3120) .
Poly V-belt removed (13-1200) .
Cylinder head cover removed (01-0500) .
Operation no. of operation texts and work units or standard texts and flat rates
03-1101
Checking setting of TDC sensor
| Piston of cylinder 1 | turn to 10° before ignition TDC. |
| Spark plug of cylinder 1 | remove, install. |
| TDC sensor (L1) | unbolt, bolt on. |
| TDC sensor (L1) | remove from adjusting slide (3). |
| Dial gauge holder (02) 136 589 04 21 00 | install. |
| Dial gauge (01) and extension (length 155 mm) | insert into dial gauge holder (02) with 4 mm preload. |
| Crankshaft | rotate in direction of rotation of engine and set TDC on cylinder 1 with dial gauge (01). |
| Large pointer of dial gauge (01) | zero. |
| Crankshaft | rotate in direction of rotation of engine until dial gauge has moved back by the value, see table "piston travel" (20° after TDC of cylinder 1). |
| Locating device (4) 119 589 00 21 00 | insert into adjusting slide (3). |
| Locating device (4) 119 589 00 21 00 | must engage over measuring pin on vibration damper (6). |
Correcting setting of TDC sensor
| Engine 104.98: | open cap of cooling system (release pressure). |
| Engine 104.98: | remove heating water return line (25), install; replace seal. |
| Engine 104.98: | plug opening of coolant pump. |
| Bolt (5) of adjusting slide (3) | slacken. |
| Adjusting slide (3) | move until locating device engages over measuring pin (4) on vibration damper (6). |
| Bolt (5) | tighten. |
| Engine 104.98: | pour in coolant (20-0100) . |
| Engine 104.98: | check cooling system for leaks (20-0170) . |
PISTON TRAVEL WITH CRANKSHAFT IN POSITION 20° AFTER TDC OF CYLINDER 1 IN MM
| Engine (1) | 104.94 | 104.98 | 104.99 | ||
| Measurement vertically on piston | 2.75 | 3.07 | 3.25 | ||
|
|||||
Special tools
SHOP-MADE TOOL
| Measuring pin extension for dial gauge | length 155 mm |
NOTE:
The TDC sensor (L1) with bracket is attached to the timing case cover.
The measuring pin (arrow) in the vibration damper must be positioned in the middle below the TDC sensor (L1) at 20° after TDC in cylinder 1.
The setting of the TDC sensor must be checked and corrected, as necessary:
- When replacing the crankshaft or the vibration damper.
- When replacing the timing case cover.
- When adding parts to short engines.
With the cylinder head removed, attach a dial gauge holder to the crankcase and place dial gauge pin vertically onto the piston crown.