Fuel System - Tightening Torques (n52)

13 71 Air intake silencer

		Type	Thread	Measure
1AZ	Clean-air gaiter to throttle valve	N52K	Hose clamp	3 Nm
2AZ	Gaiter to intake muffler	N52K	Hose clamp	3 Nm
3AZ	Intake silencer to body	N52K	M6	8 Nm
4AZ	Intake duct to front wall	N52K/N54	Self-tapping screw	2 Nm
5AZ	Air duct to air silencer	N54	Hose clamp	3 Nm
6AZ	Air duct to crankcase	N54	M6	9 Nm
7AZ	Charge-air duct to bracket	N54	M6	9 Nm
8AZ	Air duct, compressor to basic engine	N54	M6	9 Nm
9AZ	Pressure sensor to charge-air duct	N54	M6	2 Nm
10AZ	Engine sound system to charge-air duct	N54	Hose clamp	3 Nm
11AZ	Engine sound line to sound system	N54	Hose clamp	3 Nm
12AZ	Holder for air duct to cylinder head	N54	M6	9 Nm
13AZ	Air intake hose to throttle valve assembly	N52K	Hose clamp	3 Nm

TIGHTENING TORQUE SPECIFICATION - AIR INTAKE SILENCER

		Type	Measure
1AZ	Carburetor to intake manifold	M10/M20/M30	10 Nm
2AZ	Carburetor to insulating flange	M10/M20/M30	10 Nm
3AZ	Insulating flange to intake manifold	M10/M20/M30	10 Nm
4AZ	Idling shut off valve; max.	M10/M20/M30	5 Nm
5AZ	Flow valve; max.	M10/M20/M30	28 Nm
6AZ	Throttle valve assembly to float housing; max.	M10/M20/M30	9 Nm
8AZ	Throttle valve control to carburetor; max.	2BE	3 Nm
9AZ	Warm-up regulator to engine	M10/M20/M30	23 Nm

TIGHTENING TORQUE SPECIFICATION - CARBURETOR

		Type	Thread	Measure
1AZ	Fuel line to filter housing and injection pump
Coupling nut		M21/M51/M41	M14 x 1.5	14 Nm
Adapter		M21/M51/M41	M12 x 1.5	9 Nm
Hollow bolt		M21/M51/M41	M14 x 1.5	14 Nm
2AZ	Fuel filter to holder	M51/M41	M8	22 Nm
3AZ	Air duct to fuel cooler	M47		5.7 Nm
		M57		2 Nm
4AZ	Fuel filter cover	M47		25 Nm
5AZ	Fuel filter with holder to body	N42		8.8 Nm

TIGHTENING TORQUE SPECIFICATION - FUEL FILTER

		Type	Thread	Tightening specification	Measure
1AZ	Fuel rail	N52, N52K	M6 x 12		9 ± 1 Nm
2AZ	Fuel rail	N51	M6 x 16		9 ± 1 Nm

TIGHTENING TORQUE SPECIFICATION - FUEL INJECTION NOZZLES AND PIPES

		Type	Thread	Tightening specification	Measure
1AZ	Fuel rail	N52K	M6		9 Nm

TIGHTENING TORQUE SPECIFICATION - FUEL INJECTION NOZZLES AND PIPES

		Type	Thread	Tightening specification	Measure
1AZ	Fuel injector to intake manifold	All	M6		10 Nm
2AZ	Coupling nut on fuel injector	All/with K-Jetr.			25 Nm

TIGHTENING TORQUE SPECIFICATION - FUEL INJECTORS

		Type	Thread	Measure
1AZ	Fuel pump to engine	All		12 Nm
2AZ	Fuel pipe coupling bolt	All/with K-Jetr.	M8	9 Nm
3AZ	Fuel pipe coupling bolt	All/with K-Jetr.	M12	20 Nm
4AZ	Fuel pipe to pressure regulator	All/with L-Jetr.		30 Nm
5AZ	Return pipe connector to pressure regulator	All/with L-Jetr.		27 Nm

TIGHTENING TORQUE SPECIFICATION - FUEL PUMP WITH DRIVE AND PIPES

		Type	Measure
1AZ	Plug for high pressure section of injection pump	M21/M51/M41	25 Nm
2AZ	Distributor injection pump to holder	M21/M51/M41	25 Nm
3AZ	Electric shutoff to injection pump	M21/M51/M41	20 ± 5 Nm
4AZ	Electric cold start valve to injection pump	M21	20 Nm
5AZ	Coupling bolt (OUT) to injection pump (fuel return)	M21/M51/M41	25 Nm
6AZ	Pressure valve holder to injection pump	M21/M51	45 Nm
7AZ	Expansion element housing (temperature dependent idling speed boost) to injection pump	M21	18 Nm
8AZ	Distributor injection pump to flange and console	M21/M51/M41	22 Nm
9AZ	Electr. line on fuel cutout device	M51/M41	2.5 Nm
10AZ	Fuel feed line to injection pump (VP44)	M47	30 Nm
11AZ	Fuel return line to injection pump (VP44)	M47	25 Nm
12AZ	Plug for static basic adjustment (injection pump VP44)	M47	13 Nm
13AZ	Blocking screw for injection pump shaft without spacer plate (injection pump VP44)	M47	31 Nm
14AZ	Blocking screw for injection pump shaft with spacer plate (injection pump VP44)	M47	13 Nm
15AZ	Injection line (union nut) to injection pump (VP44)	M47	30 Nm

TIGHTENING TORQUE SPECIFICATION - INJECTION PUMP, CONTROL RECEPTACLE

		Type	Thread	Tightening specification	Measure
1AZ	Camshaft sensor to cylinder head	N52K	M6		9 Nm
2AZ	Crankshaft sensor to crankcase	N52K	M6	Replace aluminium screws/bolts	3 Nm
3AZ	Knock sensor to crankcase	N52K	M8	Replace aluminium screws/bolts	10 Nm
4AZ	Differential pressure sensor to intake manifold	N52K	K50x20		6 Nm
5AZ	Water temperature sensor, screwed	N52K	M12x1.5		13.5 Nm
6AZ	Magnet wheel to eccentric shaft	N52K	M6x20		8 Nm
7AZ	VVT sensor to bearing bridge	N52K	M6x14		8 Nm
8AZ	Air mass sensor	N52K			1.5 Nm

TIGHTENING TORQUE SPECIFICATION - SENDERS FOR CONTROL UNIT

		Type	Thread	Measure
1AZ	Camshaft sensor to cylinder head	N52/N52K/N53	M6x16	8.8 Nm
2AZ	Crankshaft sensor to crankcase	N52/N52K/N53	M6x16	3 Nm
3AZ	Knock sensor to crankcase	N52/N52K/N53	M8x31	10 Nm
4AZ	Differential pressure sensor to intake manifold	N52/N52K/N53	K50x20	6 Nm
5AZ	Water temperature sensor, screwed	N52/N52K/N53	M12x1.5	13.5 Nm
6AZ	Magnet wheel to eccentric shaft	N52/N52K/N53	M6x20	8 Nm
7AZ	VVT sensor to bearing bridge	N52/N52K/N53	M6x14	8 Nm
8AZ	Air mass sensor	N52/N52K/N53		3 Nm

TIGHTENING TORQUE SPECIFICATION - SENDERS FOR CONTROL UNIT

		Type	Measure
1AZ	Temperature time switch	M21/M51	18 Nm
2AZ	Temperature sensor, water	M60/1/M60/2/M21/M51	18 Nm
2AZ	Temperature sensor, water	All others	13 Nm
3AZ	Temperature switch	All	28 Nm
4AZ	Temperature sensor, air	All	13 Nm
5AZ	Charge-air pressure sensor to bracket	M51/M41	4 Nm
Charge-air pressure sensor to intake manifold		M47	5 Nm
6AZ	Dual temperature sensor (4-pin plug connection)	M41/M43/M44/S50/S52/M52/M57/M67/M62/M73	13 Nm
7AZ	Air-mass sensor on lower section of intake filter housing	M51	3.5 Nm
Air-mass flow sensor to cylinder head cover		M47/M47TU/M57/M57TU/M57T2	4.5 Nm
8AZ	Pulse generator, camshaft to cylinder head cover	M57	4.5 Nm
		M47TU/M57TU	3.5 Nm
		M57T2	2.3 Nm
9AZ	Intake neck on air-mass flow sensor	M47	9 Nm

TIGHTENING TORQUE SPECIFICATION - SENDERS FOR CONTROL UNIT

		Type	Thread	Tightening specification	Measure
1AZ	Throttle-valve assembly to intake manifold	N52K	M6 x 50		9 Nm

TIGHTENING TORQUE SPECIFICATION - THROTTLE AND ACTUATOR