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N73B60 Engine - Diagnosis

Intake Manifold

The intake system is a complete component constructed of magnesium in a shell type
design and has separate manifold chambers for each cylinder bank.

1. Intake manifold pressure sensors

2. Captured gaskets

3. Pressure control valves for crankcase

ventilation

4. Throttle valves

The individual parts of the intake system are bonded and bolted to each other, providing
considerable weight reduction (separating the shell halves is not permitted).

The entire intake system is protected against corrosion by a dip coating procedure.  The
fastening bolts of the add on parts are also coated and must be replaced in the event of
damage, to prevent corrosion and pitting.

All of the gaskets (2) are secured by retainers (captured) to provide ease of installation.  The
intake system is isolated from the engine by rubber elements on the fastening bolts. 

An intake manifold pressure sensor (1) is used for each cylinder bank.  Recording the man-
ifold differential pressure is necessary for the correct throttle position (synchronization) so
that a manifold differential pressure of 50 mbar can be balanced on each bank.

Both sides of the induction system are fitted with a pressure control valve (3) for crankcase
ventilation which is distributed to both banks.

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When replacing the spark plugs, it is necessary to remove the entire intake system to

avoid damaging the spark plugs during installation.  The spark plugs must be replaced
every 100,000 miles in US vehicles.

KT-9589

Summary of Contents for N73B60

Page 1: ...ents Intake Manifold 6 Cylinder Head Cover 8 Ancillary Components and Drive Belts 9 Cylinder Heads 10 Valvetronic 11 Fuel Injectors 14 Lubrication Components 15 Crankshaft and Bearings 17 Pistons and...

Page 2: ...during disassembly reassembly of the engine This will be valuable to you as supplementary information or a memory refresher when performing repairs in the future N No ot te e For more in depth and det...

Page 3: ...and driving dynamics in the 12 cylinder market segment as well as significantly reduce fuel consumption For the first time at BMW Valvetronic technology combination of Bi VANOS and variable intake val...

Page 4: ...rpm 550 6500 600 6500 Compression ratio 11 3 1 10 1 Valves per cylinder 4 2 Intake valve diam mm 35 42 Exhaust valve diam mm 29 36 Intake valve lift mm 0 3 9 85 10 3 Exhaust valve lift mm 9 7 10 3 Eng...

Page 5: ...5 N73B60 Engine Diagnosis Power and Torque Output N73B60 M73B54 N73B60 M73B54 Engine RPM...

Page 6: ...vent of damage to prevent corrosion and pitting All of the gaskets 2 are secured by retainers captured to provide ease of installation The intake system is isolated from the engine by rubber elements...

Page 7: ...ssure sensors 1 L R Remove bolts 2 along sections 3 Lift intake manifold up to remove Questions H Ho ow w m ma an ny y a at tt ta ac ch hiin ng g b bo ollt ts s a ar re e t th he er re e W Wh ha at t...

Page 8: ...e t tiig gh ht te en niin ng g t to or rq qu ue e f fo or r t th he e c co ou up plliin ng g n nu ut ts s o on n f fu ue ell lliin ne es s 3 3 6 6 N Nm m W Wh ha at t s sh ho ou ulld d y yo ou u d do...

Page 9: ...ting a locking pin as shown 2 The cooling module of the N73 includes an external engine oil cooler The engine oil cooler is located in front of the engine coolant radiator above the A C condenser The...

Page 10: ...condary air ducts for subsequent exhaust gas treatment are integrated in the cylin der heads The cylinder heads are cooled by the cross flow principle The cylinder heads are made from aluminum and are...

Page 11: ...d and load This means that the air volume is controlled according to engine requirements The valve gear is essentially the same as the N62 engine and has been adapted to the geometry of the N73 with t...

Page 12: ...the eccentric shaft teeth This design provides ease of removal if the motor gear fails Diagram shown to the right 1 Eccentric shaft 2 Intake camshaft 3 Mounting for high pressure fuel pump 4 Exhaust c...

Page 13: ...be used C Ca an n t th he e N N7 73 3 c cy ylliin nd de er r h he ea ad ds s b be e m ma ac ch hiin ne ed d I If f s so o w wh ha at t iis s t th he e lliim miit t I If f s so o h ho ow w d do oe es...

Page 14: ...by a twin hold down fixture one hold down fixture for every two fuel injectors The twin hold down fixtures are bolted to the cylinder head with spring washers the correct mounting pressure is ensured...

Page 15: ...ntegrated in the rear oil pump cover The oil filter housing 2 with o ring is threaded into the rear of the oil pump cover through an opening in the oil sump A A d dr ra aiin n p pllu ug g iis s iin nt...

Page 16: ...e VANOS units even at high oil temperatures and low speeds The oil pump power consumption is reduced by deactivating stage two 2 Monitoring the required oil pressure for the engine The piston in the c...

Page 17: ...The recess 2 directs the combustible mixture directly under the spark plug and pre vents the combustion chamber from being divided into two parts Piston rings First piston ring groove square ring Sec...

Page 18: ...a a u us se ed d p piis st to on n W Wh ha at t iis s t th he e p pe er rm miis ss siib blle e t to ot ta all w we ea ar r t to olle er ra an nc ce e b be et tw we ee en n p piis st to on n a an nd d...

Page 19: ...x xp po os se ed d c cy ylliin nd de er r c co oo olla an nt t jja ac ck ke et t Lubrication System Technical Data T Th he e r re ec co om mm me en nd de ed d o oiill iis s B BM MW W H Hiig gh h P Pe...

Page 20: ...rankcase and cylin der head are supplied with engine oil C Cr ra an nk kc ca as se e Crankshaft bearings Oil jets for piston cooling Oil jet for the drive chain bank 7 12 Tensioning rail for drive cha...

Page 21: ...low cool 8 Radiator vent line Cooling System Circuit Flow 9 Coolant reservoir 10 Water cooled alternator 11 Thermostat for transmission oil heat exchanger 12 Oil water heater exchanger for automatic t...

Page 22: ...ng during a routine coolant exchange The complex cooling system and the small ventilation ports require that time should be allowed after the cooling system has been filled for the air to escape Coola...

Page 23: ...iin ns st ta alllla at tiio on n o of f t th he e w wa at te er r p pu um mp p The impeller is made from reinforced plastic Reassemble engine using your notes taken during disassembly in addition to t...

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