Measuring crankshaft and remounting in bearings - AR03.20-P-4355L

ENGINES 137.970, 275.950 /951 /953 /954 /980 /981 /982 

Fig 1: Identifying Crankshaft Bearings

Courtesy of MERCEDES-BENZ USA

	Removing
	The oil grooves (arrows) in the thrust washers (thrust bearing) 5th main bearing = fitted bearing (5) must point towards the thrust collar of the crankshaft
1	Remove the crankshaft (2)	Engine 137	AR03.20-P-4351L
		Engine 275.950 /953 /980 /982	AR03.20-P-4351MC
		Engine 275.951/ 954/ 981	AR03.20-P-4351R
2	Clean engine parts	After bearing damage has occurred, remove any swarf which is present in the connecting rod bores and in the crankshaft and crank case oil galleries: ↓ Clean main oil gallery
	Checking
3	Inspect connecting rod	After a bearing damage has occurred: ↓ Connecting rods which overheated due to bearing damage (blue discoloration), must be replaced. The connecting rod shank must not have any cross scores and notches.
4	Check crankshaft (2)	If there is damage to the crankshaft (2): ↓ Install new crankshaft.
5	Mount crankshaft (2) radially in bearings		AR03.20-P-4355-01L
		A radial mounting of the main bearings in case of standard dimension crankshafts is possible by assigning  crankshaft bearing shells marked in colors. ↓
		Assign crankshaft bearing shells.	AR03.20-P-4360-01L
6	Mount crankshaft (2) axially		AR03.20-P-4355-02L
	Installing
7	Install crankshaft (2)	Engine 137	AR03.20-P-4351L
		Engine 275.950 /953 /980 /982	AR03.20-P-4351MC
		Engine 275.951/ 954/ 981	AR03.20-P-4351R