Posted on by

CM850 Electronic Control System – 100-002   Engine Diagrams

View Related Topic

Engine Views

 TOC

With CM850

The following illustrations provide the locations of the major external engine components, filters, and other service and maintenance points. Some external components will be at different locations for different engine models.

NOTE: The illustrations are
only a reference to show a typical engine.

SMALL | MEDIUM | LARGE
Front View (ISC, QSC8.3, ISL, and QSL9)

  1. Engine lifting bracket
  2. Crankcase breather
  3. Air intake connection
  4. Engine oil fill
  5. Front gear cover
  6. Fan pulley
  7. Vibration Damper
  8. Starter
  9. Engine oil pan drain plug
  10. Automatic belt tensioner
  11. Coolant inlet connection
  12. Water pump
  13. Turbocharger (Variable Geometry Turbocharger shown)

SMALL | MEDIUM | LARGE
Exhaust Side View (ISC, QSC8.3, ISL, and QSL9)

  1. Exhaust manifold
  2. Turbocharger (variable geometry turbocharger shown)
  3. Variable geometry turbocharger actuator
  4. Crankcase breather
  5. Rocker lever cover
  6. Engine oil fill
  7. Rocker lever housing
  8. Coolant outlet connection
  9. Coolant temperature sensor
  10. Coolant heater port
  11. Coolant inlet connection
  12. Lubricating oil cooler
  13. Lubricating oil filter
  14. Dipstick location
  15. Flywheel housing.

SMALL | MEDIUM | LARGE
Intake Side View (ISC, QSC8.3, ISL, and QSL9)

  1. Air intake connection
  2. Crankcase breather
  3. Intake air heater
  4. Intake manifold pressure and temperature sensor
  5. Turbocharger control valve
  6. Fuel rail
  7. Fuel drain manifold
  8. Fuel filter
  9. Crankcase breather draft tube
  10. Crankcase breather oil drain tube
  11. Crankshaft speed sensor
  12. Starter
  13. Lubricating oil pressure sensor
  14. Engine oil drain plug
  15. Fuel lift pump (behind ECM)
  16. Electronic control module (ECM)
  17. Air compressor
  18. Camshaft speed sensor
  19. Engine data plate
  20. High-pressure fuel pump
  21. Ambient air pressure sensor
  22. Fuel rail pressure sensor.

SMALL | MEDIUM | LARGE
Rear View (ISC, QSC8.3, ISL, and QSL9)

  1. Engine lifting bracket
  2. Crankcase breather
  3. Turbocharger speed sensor (
    only on variable geometry turbochargers)
  4. Turbocharger (variable geometry turbocharger shown)
  5. Injector drain line connection
  6. Flywheel housing
  7. Flywheel
  8. Engine oil drain plug
  9. OEM fuel supply line connection
  10. OEM fuel drain line connection
  11. Air intake connection.

SMALL | MEDIUM | LARGE
Top View (ISC, QSC8.3, ISL, and QSL9)

  1. Turbocharger compressor inlet temperature sensor
  2. Turbocharger air inlet
  3. Turbocharger air outlet
  4. Turbocharger exhaust outlet
  5. Turbocharger actuator air line
  6. Crankcase breather
  7. Flywheel housing
  8. Crankcase breather oil drain tube
  9. Crankcase breather draft tube
  10. Turbocharger control valve
  11. Fuel filter bracket
  12. Air inlet connection
  13. High-pressure fuel pump
  14. Crankcase pressure sensor (
    only on recreational vehicles)
  15. Engine oil fill
  16. Coolant outlet connection
  17. Coolant inlet connection.

ISB

SMALL | MEDIUM | LARGE
Intake Side View (CM850 Electronic Control Module)

  1. Exhaust pressure sensor
  2. Fuel rail pressure relief valve
  3. Fuel rail
  4. Intake manifold pressure sensor
  5. Intake temperature sensor
  6. Electronic fuel control (EFC) actuator
  7. Bosch® fuel pump
  8. Air compressor
  9. Flywheel housing
  10. Oil pressure switch
  11. Fuel filter
  12. Fuel inlet to cooling plate
  13. Oil pan drain plug
  14. Barometric pressure sensor
  15. Engine speed sensor (crankshaft)
  16. Electronic control module
  17. Engine speed sensor (camshaft)
  18. Air intake inlet
  19. EGR temperature sensor
  20. Fuel heater
  21. Fuel rail pressure sensor.

SMALL | MEDIUM | LARGE
Front View (CM850 Electronic Control Module)

  1. Fan drive
  2. EGR differential pressure sensor
  3. EGR temperature sensor
  4. Air inlet
  5. Fuel heater
  6. Fuel lift pump
  7. Fuel filter
  8. Water-in-fuel sensor
  9. Electronic control module
  10. Engine speed sensor (camshaft)
  11. Engine speed sensor (crankshaft)
  12. Vibration damper
  13. Fan or PTO drive flange mounting
  14. Starter
  15. Coolant inlet
  16. Belt tensioner
  17. Water pump
  18. Freon compressor
  19. Alternator
  20. Coolant outlet
  21. Coolant temperature sensor.

SMALL | MEDIUM | LARGE
Rear View (CM850 Electronic Control Module)

  1. Breather tube (valve cover to gear housing)
  2. EGR cooler
  3. EGR valve
  4. Air outlet from turbocharger
  5. Turbocharger exhaust outlet
  6. Flywheel housing
  7. Flywheel
  8. Gear housing
  9. Crankcase breather
  10. Fuel out (return to tank)
  11. Coolant connection for air compressor
  12. Fuel return line.

SMALL | MEDIUM | LARGE
Exhaust Side View (CM850 Electronic Control Module)

  1. Exhaust pressure sensor
  2. Coolant outlet
  3. Alternator
  4. Exhaust manifold
  5. Oil filter
  6. Coolant inlet
  7. Oil pan drain plug
  8. Turbocharger position sensor
  9. Turbocharger actuator
  10. Turbocharger compressor inlet
  11. Compressor inlet temperature sensor
  12. Turbocharger speed sensor
  13. Turbocharger exhaust outlet
  14. Starter
  15. Flywheel housing
  16. Gear housing
  17. EGR cooler
  18. EGR valve
  19. EGR actuator.

SMALL | MEDIUM | LARGE
Top View (CM850 Electronic Control Module)

  1. EGR valve
  2. EGR cooler
  3. Starter
  4. Breather tube (valve cover to gear housing)
  5. Air compressor cooling connection
  6. High-pressure fuel lines
  7. Intake temperature sensor
  8. Fuel rail
  9. Intake manifold pressure sensor
  10. Fuel rail pressure relief valve
  11. Fuel rail pressure sensor
  12. EGR temperature sensor
  13. EGR differential pressure sensor
  14. Tone wheel
  15. Vibration damper
  16. Oil fill cap
  17. Coolant temperature sensor
  18. Coolant outlet
  19. Alternator
  20. Oil filter.

Marine Applications

SMALL | MEDIUM | LARGE
QSL Front View (CM850 Electronic Control Module)

  1. Heat exchanger
  2. Coolant fill cap
  3. Expansion tank
  4. Timing case cover
  5. Engine mounting bracket
  6. Oil pan
  7. Belt and fan guard.

SMALL | MEDIUM | LARGE
QSL Port View (CM850 Electronic Control Module)

  1. Expansion tank
  2. Aftercooler air outlet
  3. Intake manifold temperature sensor
  4. Intake manifold pressure sensor
  5. Aftercooler seawater outlet
  6. Air cleaner or filter
  7. Aftercooler air inlet
  8. Aftercooler housing
  9. SAE number 1 flywheel housing
  10. Crankshaft speed sensor
  11. Oil pressure sensor
  12. Aftercooler seawater inlet
  13. Engine control module (ECM)
  14. Fuel lift pump (behind ECM)
  15. SIM module
  16. Seawater pump
  17. Camshaft position sensor
  18. Fuel filter
  19. Fuel rail pressure sensor (behind aftercooler air outlet).

SMALL | MEDIUM | LARGE
QSL Starboard View (CM850 Electronic Control Module)

  1. Water cooled exhaust elbow
  2. Heat exchanger
  3. Crankcase breather
  4. Heat exchanger coolant inlet
  5. Expansion tank
  6. Coolant level sensor
  7. Zinc anode
  8. Alternator
  9. Coolant temperature sensor
  10. Lubricating oil cooler
  11. Coolant filter
  12. Lubricating oil filter
  13. Heat exchanger coolant outlet
  14. Starter motor
  15. SAE number 1 flywheel housing.

SMALL | MEDIUM | LARGE
Rear View QSL (CM850 Electronic Control Module)

  1. Air cleaner and filter
  2. Turbocharger compressor side
  3. Turbocharger exhaust turbine side
  4. Water cooled exhaust elbow
  5. SAE number 1 flywheel housing
  6. Flywheel
  7. Aftercooler air inlet
  8. Aftercooler zinc anode.

SMALL | MEDIUM | LARGE
Front View (QSC) (CM850 Electronic Control Module)

  1. Heat exchanger
  2. Coolant fill cap
  3. Expansion tank
  4. Timing case cover
  5. Engine mounting bracket
  6. Oil pan
  7. Belt and pulley guard.

SMALL | MEDIUM | LARGE
QSC Starboard View (CM850 Electronic Control Module)

  1. Seawater outlet from heat exchanger
  2. Vacuum regulator for air filter
  3. Coolant level sensor
  4. Expansion tank
  5. Coolant outlet from heat exchanger
  6. Coolant inlet to heat exchanger
  7. Zinc anodes
  8. Coolant temperature sensor
  9. Alternator
  10. Lubricating oil cooler
  11. Lubricating oil filter
  12. Starter motor
  13. SAE number 1 flywheel housing
  14. Seawater inlet to heat exchanger
  15. Exhaust elbow
  16. Turbocharger.

SMALL | MEDIUM | LARGE
QSC Port View (CM850 Electronic Control Module)

  1. Expansion tank
  2. Intake manifold temperature sensor (behind aftercooler air outlet)
  3. Intake manifold pressure sensor (behind aftercooler air outlet
  4. Crankcase breather
  5. Aftercooler air outlet
  6. Air cleaner or filter
  7. Aftercooler seawater outlet
  8. Aftercooler seawater inlet
  9. Aftercooler housing
  10. Fuel cooler
  11. SAE number 1 flywheel housing
  12. Crankshaft speed sensor
  13. Gear cooler
  14. Oil pressure sensor
  15. Engine control module (ECM)
  16. Fuel lift pump (behind ECM)
  17. SIM module
  18. Seawater Pump
  19. Camshaft position sensor
  20. Fuel filter
  21. Fuel rail pressure sensor.

SMALL | MEDIUM | LARGE
QSC Rear View (CM850 Electronic Control Module)

  1. Air cleaner or filter
  2. Turbocharger compressor side
  3. Turbocharger exhaust side
  4. Heat exchanger seawater outlet
  5. Seawater cooled exhaust elbow
  6. Heat exchanger seawater inlet
  7. Aftercooler air inlet
  8. Aftercooler drain valve.
  9. Aftercooler seawater inlet

SMALL | MEDIUM | LARGE
QSB Front View (CM850 Electronic Control Module)

  1. Lubricating oil filter head outlet
  2. Fuel filter head outlet to high pressure fuel pump
  3. Coolant temperature sensor
  4. Fuel filter head inlet from lift pump
  5. Fuel filter
  6. Lubricating oil dipstick
  7. Fuel return from fuel cooler to tank
  8. Sea water pump inlet
  9. Timing case cover
  10. Mounting brackets
  11. Oil pan
  12. Lubricating oil drain
  13. Belt and pulley guards
  14. Lubricating oil filter
  15. Lubricating oil filter head inlet.

SMALL | MEDIUM | LARGE
QSB Port View (CM850 Electronic Control Module)

  1. Engine oil fill
  2. Sea water pump outlet
  3. Lubricating oil level gauge
  4. Sea water supply to fuel cooler
  5. Intake manifold pressure and air temperature sensor
  6. Aftercooler zinc anode (2)
  7. Aftercooler housing
  8. Aftercooler sea water outlet
  9. Turbocharger
  10. Aftercooler air inlet
  11. Flywheel housing
  12. Aftercooler sea water inlet
  13. Electronic control module (ECM)
  14. Fuel lift pump (behind ECM cooling plate)
  15. Fuel inlet connection
  16. Fuel return from injector
  17. Fuel supply to lift pump
  18. Fuel return from fuel rail pressure relief valve
  19. Fuel return from high pressure fuel pump
  20. Crankshaft speed sensor
  21. Camshaft speed sensor
  22. Oil pressure sensor
  23. Fuel pump
  24. Fuel cooler
  25. Sea water pump.

SMALL | MEDIUM | LARGE
QSB Starboard View (CM850 Electronic Control Module)

  1. Sea water outlet
  2. Closed crankcase breather system hose
  3. Crankcase breather tube banjo connection
  4. Heat exchanger
  5. Engine coolant fill line
  6. Expansion tank
  7. Coolant level sensor
  8. Heat exchanger engine coolant inlet
  9. Lubricating oil filter
  10. Alternator
  11. Belt and pulley guard
  12. Lubricating oil cooler
  13. Zinc anode
  14. Turbocharger oil supply line
  15. Coolant return junction tube
  16. Starting motor
  17. Turbocharger oil drain line
  18. Closed crankcase breather oil drain line
  19. Flywheel housing
  20. Heat exchanger engine coolant outlet
  21. Heat exchanger sea water inlet
  22. Marine gear oil cooler
  23. Turbocharger

SMALL | MEDIUM | LARGE
QSB Rear View (CM850 Electronic Control Module)

  1. Closed crankcase breather system
  2. Turbocharger, compressor side
  3. Turbocharger oil supply
  4. Turbocharger oil drain
  5. Turbocharger, turbine side
  6. Heat exchanger (behind exhaust outlet)
  7. Turbocharger coolant outlet
  8. Closed crankcase breather oil drain tube
  9. Flywheel housing
  10. Flywheel
  11. Aftercooler air inlet
  12. Aftercooler zinc anode
  13. Marine gear oil cooler
  14. Air cleaner and filter.

SMALL | MEDIUM | LARGE
QSB Top View (CM850 Electronic Control Module)

  1. Aftercooler seawater outlet
  2. Aftercooler housing
  3. Intake air connection from aftercooler to intake manifold
  4. Intake manifold pressure and temperature port
  5. Fuel rail pressure sensor
  6. Sea water supply to fuel cooler
  7. Sea water pump inlet
  8. Sea water pump
  9. Engine oil fill
  10. Coolant temperature sensor
  11. Coolant pressure side vent petcock
  12. Heat exchanger engine coolant inlet
  13. Heat exchanger
  14. Coolant fill neck
  15. Expansion tank
  16. Sea water outlet from heat exchanger
  17. Exhaust temperature and back pressure port
  18. Exhaust outlet connection
  19. Closed crankcase breather blow-by connection
  20. Air inlet restriction indicator
  21. Air cleaner connection
  22. Closed crankcase breather/air cleaner assembly.

SMALL | MEDIUM | LARGE
QSB5.9 Marine Sensors Port View

  1. Rail fuel pressure sensor
  2. Intake manifold pressure sensor
  3. Engine position/speed sensor
  4. Engine oil pressure sensor
  5. Fuel lift pump – 12-VDC and 24-VDC (behind ECM cooling plate).

SMALL | MEDIUM | LARGE
QSB5.9 Marine sensor Starboard View

  1. Coolant level sensor
  2. Coolant temperature sensor.

SMALL | MEDIUM | LARGE
QSL9 Marine Sensors Port View

  1. Fuel pump actuator high pressure
  2. Intake manifold temperature sensor
  3. Intake manifold pressure sensor
  4. Rail fuel pressure sensor
  5. Crankshaft position sensor
  6. Engine oil pressure sensor
  7. Camshaft position sensor
  8. Fuel lift pump – 12-VDC and 24-VDC (behind the ECM cooling plate)

SMALL | MEDIUM | LARGE
QSL9 Marine Sensors Starboard View

  1. Coolant temperature sensor (behind alternator)
  2. Coolant level sensor (rear of expansion tank).

SMALL | MEDIUM | LARGE
QSC8.3 Sensors Port View

  1. Rail fuel pressure sensor
  2. Intake manifold pressure sensor (behind aftercooler air outlet)
  3. Intake manifold temperature sensor (behind aftercooler air outlet)
  4. Crankshaft position sensor
  5. Engine oil pressure sensor
  6. Camshaft position sensor (front gear housing)
  7. Fuel lift pump – 12-VDC and 24-VDC (behind ECM cooling plate)
  8. Fuel pump actuator, high pressure.

SMALL | MEDIUM | LARGE
QSC8.3 Starboard View

  1. Coolant level sensor (rear of expansion tank)
  2. Coolant temperature sensor (behind alternator).
Last Modified:  26-Nov-2008
Avatar photo

Published by Jack

Hello, I'm Jack, a diesel engine fan and a blogger. I write about how to fix and improve diesel engines, from cars to trucks to generators. I also review the newest models and innovations in the diesel market. If you are interested in learning more about diesel engines, check out my blog and leave your feedback.