Install and gauge connecting rod bearings - AR03.10-P-6111-06L

TEST SPECIFICATIONS FOR CRANKSHAFT BEARING CLEARANCE

Number	Designation			Engine 137	Engine 275.95, 285.95	Engine 275.98, 285.98
BE03.20-P-1002-04E	Connecting rod bearing play	Radial measurement new	mm	0.017...0.052	0.026...0.059	0.019...0.048

CONNECTING ROD

Number	Designation			Engine 137	Engine 275, 285
BA03.10-P-1001-01E	Connecting rod bolt	Stage 1	Nm	5	5
		Stage 2	Nm	15	15
		Stage 3	∠°	90	90

Clean bearing points of connecting rod, connecting rod bearing caps and connecting rod bearing journals with a chamois leather and.
Blow out oil galleries with compressed air in direction of oil flow.

Do not use any hard objects for cleaning.
The assignment of connecting rods to connecting rod bearing journals is indicated on the back of connecting rod bearing shells by a colored dot.
Only the following color combinations of connecting rod bearing shells may be fitted to each other.
1. Upper connecting rod bearing shells of connecting rod in yellow, lower connecting rod bearing shells in connecting rod bearing cap in yellow
  Or
2. Upper connecting rod bearing shells of connecting rod in blue, lower connecting rod bearing shells in connecting rod bearing cap in red
  Or
3. Upper connecting rod bearing shells of connecting rod in red, lower connecting rod bearing shells in connecting rod bearing cap in blue
The sequence of the individual color combinations on the connecting rod bearing journals can be selected at random.
Insert connecting rod bearing shell (7) into connecting rod (4) and connecting rod bearing cap.
Connecting rod bearing shells (7) with oil holes (arrow) must be fitted in the connecting rods, otherwise the connecting rod bearings will not be lubricated. The anti-twist locks (8) of the connecting rod bearing shells (7) must be located in the grooves (9) in the connecting rod (4) and the connecting rod bearing cap.
Wet thread and head contact surfaces of bolt with engine oil.
Pretighten connecting rod bolts with torque (stage 1, stage 2).

Fig 1: Identifying Connecting Rod Bearing Shells With Oil Holes
Courtesy of MERCEDES-BENZ USA
Tighten connecting rod bolts using an angle wrench to stage 3.
If no torquing angle wrench is available, connecting rod screws can be torqued further by the specified angle in a single operation using a wrench and tommy bar. Do not use a flexi-rod torque wrench for tightening in order to avoid any angle errors.

Fig 2: Tightening Connecting Rod Bolts
Courtesy of MERCEDES-BENZ USA