Repair instructions Engine (24 V system voltage) Note. The components in the wiring diagram have the same numbers as in the perspective diagram on the previous page. NO = Normally open during operation. Cables shown with broken lines are not supplied by Volvo Penta Cable areas not specified = 0.5 mm 2 . 1. Battery (24 V). 2. Starter motor 3. Alternator 4. Pre-heating relay 5. Starter relay 6. Main relay 7. Stop relay 8. Horn 9. Sensor, coolant level 10. Oil pressure monitor 11. Oil pressure sensor 12. Coolant temperature sensor, instrument 13. Circuit breaker 14. Connector 15. Test connector 16. Control unit 17. Actuation solenoid, EDC 18. Engine speed sensor 19. Position sensor 20.
Coolant temperature sensor, EDC 21. Charge air temperature sensor. 22. Starting heater 23. Diode 24. Fuel temperature sensor 25. Charge air pressure sensor 26. Connector 27. Extra equipment The work methods described in the workshop manual apply to work in a workshop environment. For this rea- son, the engine is lifted out and mounted on an engine support. Renovation work which does not need the eng- ine to be lifted out can be done in situ, with the same work methods, unless otherwise specified. Our common responsibility Each engine consists of a large number of collabora- ting systems and components.
Any deviation of a com- ponent from its technical specification can dramatically increase the environmental impact of an otherwise good engine. For this reason, it is extremely important that specified wear tolerances are maintained, that sys- tems with adjustment facilities are correctly adjusted and that Volvo Penta Original Spares are used for the engine. The times noted in the engine maintenance schedule must be observed.
Cable colours BL = Blue P = Pink LBL = Light blue R = Red BN = Brown SB = Black LBN = Light brown VO = Violet GN = Green W = White GR = Grey Y = Yellow OR = Orange The warning signs which occur in the workshop manual (please refer to “Safety information“ for their meanings) WARNING! IMPORTANT! Some systems, such as components in the fuel sys- tem, may require special competence and special test equipment. For environmental reasons etc., some com- ponents are sealed at the factory. It is only permissible to work on sealed components if you are authorised to do such work. NOTE!
are not comprehensive in any way, since we can not of course foresee everything, since service work is done in highly varying circumstances. For this reason, all we can do is to point out the risks which we believe could occur due to incorrect work in a well-equipped work- shop, using work methods and tools tested by us. Remember that most chemical products, incorrectly used, damage the environment. Volvo Penta recom- mends the use of biodegradable degreasers whenever engine components are de-greased, unless otherwise specified in the workshop manual. Be careful to ensure that oils, wash residue letc. are processed for destruc- tion, and are not inadvertently discharged to the envi- ronment.
Tightening torque In the workshop manual, all tasks for which there are Volvo Penta special tools, are done using these tools. Special tools are specially prepared to permit the sa- fest and most rational work methods possible. For this reason, it is the responsibility of the person who uses other tools or other work methods than those recom- mended by us, to ensure that there is no risk of perso- nal injury or material damage, and that they can not cause any malfunctions. The tightening torque for vital fasteners, which should be tightened with a torque wrench, are listed in “Techni- cal Data“. “Tightening torque“ and are specified in the workshop manual job descriptions.
All torque specifica- tions apply to clean screws, screw heads and mating faces. The torque specifications apply to lightly oiled or clean screws. If lubricants, locking fluids or sealants are needed on a fastener, the type of preparation to be used will be noted in the job description and in “Tight- ening Torques“. Where a particular torque value is not specified for any fastener, the general tightening tor- ques in the table below shall apply. The torque specifi- cation is a target value and the fastener does not need to be tightened with a torque wrench.
In some cases, special safety regulations and user ins- tructions are available for the tools and chemicals mentioned in the workshop manual. These rules must always be observed, so there are no special instruc- tions about this in the workshop manual. Wiring diagram for TWD740VE engine The majority of risks can be prevented by taking cer- tain elementary precautions and using common sense. A clean workplace and a clean engine eliminate many risks of both personal injury and malfunction.
Above all, when work on fuel systems, lubrication sys- tems, inlet systems, turbocharger, bearing caps and seals is done, it is extremely important that no dirt or other kinds of foreign particles are able to get in, since this would otherwise cause malfunctions or shortened repair life. Dimension Tightening torque Nm M5 ......................................................... 6 M6 ......................................................... 10 M8 ......................................................... 25 M10 ....................................................... 50 M12 ....................................................... 80 M14 .......................................................
140 6 47