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Old 05-22-2011, 09:51 AM
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Default BMW N74 engine - service training

  • BMW N74 engine - service training. 51 page. Language - English.
After completion of this module you will be able to:
• Describe the features of the N74B60U0 engine
• Describe the specifications of the N74 engine
• Identify the internal and external components of the N74 engine
Contents:

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
N74 Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
N74 Engine Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Horse Power and Torque Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Engine Components/Systems Overview . . . . . . . . . . . . . . . . . . . . . . .11
Engine Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Engine designation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Engine identification and number . . . . . . . . . . . . . . . . . . . . . . . . . .13

Engine Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Engine Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Cylinder Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Cylinder Head Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Oil Sump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Crankcase Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Register Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Oil Separation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Crankshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Crankshaft Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Connecting Rods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Pistons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Camshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Chain Tensioner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Valve Train . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
VANOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Camshafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Roller Cam Followers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Belt Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Oil Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Oil Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Pressure Limiting Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Oil Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Oil Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Oil Spray Nozzles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Oil spray nozzles for piston crown cooling . . . . . . . . . . . . . . . . . . .29
Oil spray nozzles for timing chain lubrication . . . . . . . . . . . . . . . .29
Oil Level Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Engine Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Coolant Pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Main coolant pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Auxiliary water pump for exhaust turbochargers . . . . . . . . . . . . . .32
Expansion Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Charge Air Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Auxiliary Coolant Pump for Charge Air Cooling . . . . . . . . . . . . . . . . .35
Charge-air Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Engine Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Intake Air Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Turbocharging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Exhaust Turbocharger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Charging Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Blow-off control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Charge Air Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Intake Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Exhaust System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Exhaust Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Exhaust Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Secondary Air System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Secondary air pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Secondary air valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
On-board diagnosis of secondary air system . . . . . . . . . . . . . . . .43
Vacuum System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Fuel Injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
High Pressure Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Hydraulic Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Injectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Outward-opening Piezo Injector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
Attached Files
File Type: pdf www.bmwcoders.com_ST915 - N74.pdf (1.34 MB, 577 views)


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4evermetalhead (08-05-2011), beongo (07-01-2011), binsheng (07-26-2011), bmw_lbn (02-18-2013), cnafets.sol (05-22-2019), flip49 (08-06-2012), jrwrx7 (06-05-2013), laurent1702 (08-15-2013), Lukidj (12-09-2012), M3freak (12-25-2012), newtech (07-30-2013), proust2046 (11-28-2012), reality (07-27-2012), rocris (11-02-2012), slimak4 (01-16-2013), the cash (08-09-2013), tridoc (10-08-2012)
  #2  
Old 07-31-2012, 08:05 PM
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Awill thank you vary much for this information
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  #3  
Old 08-15-2013, 10:19 PM
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Default N74

Thanks a lot for these information's!

I'm working on a adaptation of the N74 engine on something else than a 760iL.
Is there a chance to find the whole engine parts break out as depicted in the manufacturer program?

That would make my life easier....

Thanks in advance for your replies.

Laurent
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Old 01-15-2014, 07:39 PM
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I can't find the download - I get an empty site :-(

who can help?
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  #5  
Old 05-12-2014, 01:00 PM
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me too. Would really like to get my hands on this doc!

thanks, John
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Old 09-26-2014, 06:30 PM
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empty site as well :(
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