S 420 (140.043) V8-4.2L (119.971) (1994)
/v8-4.2l_(119.971)/Page-597003.png)
-
If bearing damage has occurred, the conrods must be removed and any metal particles removed from the conrod bores and the oil passages of the
crankshaft.
-
Carefully clean the oil passages in the crankcase, crankshaft, timing case cover, oil filter housing, closing cover, oil pump etc.
-
Examine crankshaft for cracks, dimensional tolerance and hardness.
Matching Crankshaft Bearings, Installing Crankshaft
1. Install crankshaft bearing caps, pay attention to marking, I is to the front.
-
The fit face is asymmetrical (arrows); the crankshaft bearing caps can thus only be installed in one position.
2. Oil thread and contact surface of nuts.
-
Tighten nuts to: 50 Nm.
3. Oil thread and head contact surface of side bolts (M10 X 40), install with the washers.
-
Tighten to: 50 Nm.
4. Measure crankshaft bearing bore in direction A, B and C at two levels (conicity); note measured values.
-
If a crankshaft bearing bore exceeds the specified value or is conical, dress bearing cap at its mating surface on a dressing plate up to max.
0.02 mm.
5. Insert bearing shells, install crankshaft bearing cap.
-
Tighten nuts and side bolts to: 50 Nm.
6. Measure bearing diameter and note.
