Tightening procedure for exhaust manifold - AR14.10-P-3000-01MM

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ENGINE 157, 276, 278

TURBOCHARGER

Number	Designation			Engine 157	Engine 278
BA09.40-P-1001-01R	Nut, turbocharger/exhaust manifold to cylinder head	M7	Nm	15	15
BA09.40-P-1001-01R	Nut, turbocharger/exhaust manifold to cylinder head	M8	Nm	20	20

EXHAUST MANIFOLD

Number	Designation		Engine 276.8	Engine 276.9
BA14.10-P-1001-01E	Nut, exhaust manifold to cylinder head	Nm	20	16

Tightening procedure for ENGINE 157, 278, shown on ENGINE 278

Fig 1: Exhaust Manifold Bolts Tightening Sequence - Shown On Engine 278

Courtesy of MERCEDES-BENZ USA

Tightening procedure for ENGINE 276 with CODE 920 (gasoline direct injection with stratified charge)

Fig 2: Exhaust Manifold Bolts Tightening Sequence - Shown On Engine 276 With Code 920

Courtesy of MERCEDES-BENZ USA

Tightening procedure for ENGINE 276 except CODE 920 (gasoline direct injection with stratified charge)

Fig 3: Exhaust Manifold Bolts Tightening Sequence - Shown On Engine 276 Without Code 920

Courtesy of MERCEDES-BENZ USA

Tighten nuts according to the numerical sequence as per the figure.
Screw/bolts and nuts must be replaced after every disassembly.

Ensure correct seating of the exhaust manifold seal on cylinder head and exhaust manifold.