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Tightening Procedure Of Integrated Starter Alternator - AR15.40-P-0003-01MRT

Engine 176 

Engine 177 

Engine 256.9 

Topical note Notes on threaded connections fastened using a tightening angle-based tightening process AH00.00-P-0020-01A
INTEGRATED STARTER ALTERNATOR

Number Designation Engine 176 Engine 177
BA15.40-P-1002-02A Bolt, centering flange to crankshaft Stage 1 Nm 45 45
Stage 2 ∠° 90 90
STARTER-ALTERNATOR

Number Designation Engine 256
BA15.40-P-1002-02MRT Bolt, centering flange to crankshaft Stage 1 Nm 45
Stage 2 ∠° 90
INTEGRATED STARTER ALTERNATOR

Number Designation Engine 176 Engine 177
BA15.40-P-1003-02A Bolt, integrated starter alternator to crankshaft Stage 1 Nm 45 45
Stage 2 ∠° 90 90
STARTER-ALTERNATOR

Number Designation Engine 256
BA15.40-P-1003-02MRT Bolt, integrated starter alternator to crankshaft Stage 1 Nm 45
Stage 2 ∠° 90

IMPORTANT Replace all screws/bolts with new ones.

NOTES Compliance with the tightening instructions is mandatory.

Otherwise, the rotor is in danger of tilting.

  1. Screw in screws (1, 2, 3, 4) of the integrated starter alternator (A79) on the crankshaft up to the screw head bearing surface.
  2. Then, screw in screws (1, 2, 3, 4) of the integrated starter alternator (A79) on the crankshaft in the numerical sequence until the rotor makes contact with the crankshaft flange. Tighten screws (1, 2, 3, 4) of the integrated starter alternator (A79) on the crankshaft again with torque stage 1 in the numerical sequence

    Engine 256.9

    TORQUE SPECIFICATION Engine 176

    Engine 177 TORQUE SPECIFICATION

    IMPORTANT When tightening the screws (1, 2, 3, 4), counterhold engine on the crankshaft.

    G14548271Courtesy of MERCEDES-BENZ USA
  3. Tighten screws (A, B, C, D) of the centering flange (10) on the crankshaft with torque stage 1 in the alphanumerical sequence Engine 256.9

    TORQUE SPECIFICATION Engine 176

    Engine 177 TORQUE SPECIFICATION

    IMPORTANT Install new centering flange (10) every time the engine and the transmission are disconnected from each other.

    IMPORTANT When tightening the screws (A, B, C, D), counterhold the engine on the crankshaft.

  4. Tighten screws (1, 2, 3, 4) of the integrated starter alternator (A79) on the crankshaft with tightening angle stage 2 in the numerical sequence Engine 256.9

    TORQUE SPECIFICATION Engine 176 Engine 177 TORQUE SPECIFICATION .

    IMPORTANT When tightening the screws (1, 2, 3, 4), counterhold engine on the crankshaft.

  5. Tighten screws (A, B, C, D) of the centering flange (10) on the crankshaft with tightening angle stage 2 in the alphanumerical sequence.

    IMPORTANT When tightening the screws (A, B, C, D), counterhold the engine on the crankshaft.

    G14548272Courtesy of MERCEDES-BENZ USA
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