Nissan Z - ZX 1970-1988 Repair Guide

Engine

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See Figures 1, 2 and 3



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Fig. Fig. 1: Exploded view of L-type engine-1970-83 models



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Fig. Fig. 2: Exploded view of V-type engine-1984-88 models



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Fig. Fig. 3: Outer components of V-type engine-1984-88 models

REMOVAL & INSTALLATION



1970-83 Models

The instructions below provide for removal of the engine and transmission as a unit, as this makes the operation easier and faster; the transmission removal is easier after the engine is out of the vehicle.

All operations involving hoisting the engine-transmission unit should be done with extreme care and should be carefully planned before hand. Read the procedure through before beginning. It is best to use fender covers so that the fenders will not be damaged during removal or installation.

  1. On fuel injected models, the fuel system should be bleed before the battery is disconnected. See the procedure for changing the fuel filter, given in General Information & Maintenance . Disconnect the battery cables, the negative cable first.
  2.  
  3. Using a scribing tool, mark the location of each hood hinge on the hood to facilitate reinstallation.
  4.  
  5. Carefully support the hood so that its weight will not be resting on the hinge bolts. Then, remove the bolts.
  6.  
  7. Remove the hood with the help of an assistant.
  8.  
  9. Remove the air cleaner.
  10.  


CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

  1. Drain the cooling system and the engine crankcase.
  2.  


CAUTION
When draining coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. On automatic transmission models, remove the splash shield. Disconnect and plug the transmission cooler lines at the radiator. Disconnect the vacuum modulator hose at the intake manifold.
  2.  
  3. Disconnect the radiator hoses at the radiator. Remove the radiator mounting bolts, the radiator and the shroud.
  4.  
  5. On models with air conditioning, loosen the compressor mounting bolts and remove the drive belt. Unbolt the compressor and move it aside but DO NOT disconnect any of the refrigerant lines. If there is not enough slack in the lines (this may be the case on some earlier models), the system will have to be discharged and the lines disconnected. Unless you are thoroughly familiar with air conditioning systems, this job should be referred to a specialist with proper training.
  6.  


WARNING
If it is necessary to disconnect the refrigerant lines from the compressor, use an approved recovery/recycling machine or consult a professional who has the necessary equipment.

  1. On models with power steering, loosen the pump mounting bolts and remove the drive belt. Remove the mounting bolts and move the pump away from the engine. DO NOT disconnect the power steering hoses.
  2.  
  3. On carbureted models, disconnect the accelerator linkage (see the illustration).
  4.  
  5. Disconnect and label the following:
    1. Battery ground cable from the engine.
    2.  
    3. Starter wiring.
    4.  
    5. Coil-to-distributor high-tension cable.
    6.  
    7. Primary wire to the distributor at the connection.
    8.  
    9. Wire to the temperature senders.
    10.  
    11. Wire to the water temperature switch at the connector.
    12.  
    13. Alternator wires.
    14.  
    15. Choke heat wires (1974) or linkage.
    16.  
    17. Throttle solenoid wire (manual transmission) and throttle linkage.
    18.  
    19. EGR solenoid wire at the connector, if equipped.
    20.  
    21. Wire to the vacuum solenoid (manual transmission).
    22.  
    23. Fuel lines(s) (two for 1974 models); on fuel injected models be sure to relieve fuel line pressure as outlined in fuel filter replacement in General Information & Maintenance and to disconnect all electrical wiring to the fuel injection.
    24.  
    25. Heater hoses.
    26.  
    27. Vacuum line to the brake cylinder at the manifold.
    28.  
    29. Wires for the back-up lights, the neutral safety switch and to the detecting switch.
    30.  
    31. Inhibitor switch and kick-down solenoid wires (automatic only).
    32.  

  6.  
  7. Remove the clutch master cylinder (manual transmission only).
  8.  
  9. Disconnect the speedometer cable where it enters the rear extension housing of the transmission.
  10.  
  11. Disconnect the transmission control linkage.
  12.  
  13. Remove the shift lever (manual transmission) or disconnect the range selector (automatic transmission).
  14.  
  15. Disconnect the exhaust tube from the manifold.
  16.  
  17. Mark the companion flange and the driveshaft for installation in the same place, then disconnect the shaft at the rear by removing the four bolts. Remove the shaft from the rear of the transmission and seal the opening.
  18.  
  19. Support the transmission carefully to remove all weight from the rear mounts. Remove the bolts which secure the rear mounts to the body.
  20.  
  21. Connect an adequate cable or chain between the two lifting hooks on the engine. Hook a cable or chain to a hoist and apply just enough lift to take the weight off the front mounts.
  22.  
  23. Remove the engine support-to-front mounting insulator bolts.
  24.  
  25. Working carefully to avoid damaging the engine or body parts, tilt the engine, lowering the transmission jack as necessary, until it can be pulled up and out of the engine compartment, front first.
  26.  
  27. Remove the transmission from the engine and mount the engine on a secure stand.
  28.  

To install:

When reinstalling the engine, first carefully inspect the engine mounts. If any part of the mount is damaged or if the bonded surface is deteriorated or separated, replace the mount. The front mounts are identical but are installed in different positions on the right and left. The rear mount must also be installed in the proper direction.

  1. Install the engine to the transmission.
  2.  
  3. Working carefully to avoid damaging the engine or body parts, tilt the engine and raise the transmission jack as necessary, lower the engine into the engine compartment.
  4.  
  5. Install the engine support-to-front mounting insulator bolts.
  6.  
  7. Support the transmission carefully to remove all weight from the rear mounts. Install the bolts which secure the rear mounts to the body.
  8.  
  9. Align the marks on the companion flange and the driveshaft, then connect the shaft at the rear by installing the four bolts.
  10.  
  11. Disconnect the cable or chain hoist.
  12.  
  13. Connect the exhaust tube to the manifold.
  14.  
  15. Install the shift lever (manual transmission) or connect the range selector (automatic transmission).
  16.  
  17. Connect the transmission control linkage.
  18.  
  19. Install the clutch master cylinder (manual transmission only).
  20.  
  21. Connect the speedometer cable where it enters the rear extension housing of the transmission.
  22.  
  23. Connect all the wires and hoses that were labeled during removal.
  24.  
  25. On carbureted models, connect the accelerator linkage (see the illustration).
  26.  
  27. On models with power steering, install the pump and drive belt.
  28.  
  29. On models with air conditioning, install the compressor and drive belt. If necessary to recharge the system, refer to General Information & Maintenance .
  30.  
  31. Connect the battery cables. positive first then negative.
  32.  
  33. Install the hood with the help of an assistant.
  34.  
  35. Install the air cleaner.
  36.  
  37. On automatic transmission models, install the splash shield. Connect the transmission cooler lines at the radiator. Connect the vacuum modulator hose at the intake manifold.
  38.  
  39. Install the radiator and shroud. Connect the radiator hoses at the radiator.
  40.  
  41. Fill the cooling system and the engine crankcase.
  42.  

1984-88 Models

See Figures 4, 5, 6, 7, 8 and 9



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Fig. Fig. 4: Before beginning any work, identify the major components of the engine compartment



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Fig. Fig. 5: Remove the hood shock retaining bolts



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Fig. Fig. 6: Remove the hood hinge retaining bolts, then remove the hood

  1. Using a scribing tool, mark the hood hinges' positions on the hood. With an assistant helping support the hood, unfasten the hood shocks and hinges, then remove the hood.
  2.  
  3. With the engine running, remove the rear luggage mat and disconnect the fuel pump harness connector. After the engine stalls, crank the engine 2-3 times, then turn the engine OFF and reconnect the fuel pump harness connector.
  4.  
  5. Disconnect and remove the battery.
  6.  
  7. If equipped with power steering and/or air conditioning, remove the power steering pump and/or the air conditioning compressor.
  8.  

When removing the power steering pump and/or the air conditioning compressor, DO NOT disconnect the hoses, simply move the item aside and suspend it on a wire to avoid damaging the hoses.

  1. Drain the cooling system and the engine oil.
  2.  



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Fig. Fig. 7: Loosen the draincock to release any coolant in the radiator



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Fig. Fig. 8: Drain the oil from the drain pan


CAUTION
When draining coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze, and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Remove the air cleaner and the radiator hoses.
  2.  


CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

  1. Disconnect the fuel lines and the emission control canister hoses. Remove the emission control canister.
  2.  
  3. If equipped with an Automatic Transmission, disconnect and plug the oil cooler lines from the radiator.
  4.  
  5. If equipped with a lower splash guard, remove it. Remove the radiator and the shroud.
  6.  



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Fig. Fig. 9: If equipped, remove the lower splash shield

  1. Disconnect the accelerator linkage from the throttle body.
  2.  
  3. Identify, tag and disconnect the wiring connectors from the alternator, the starter, the EGR solenoid valve, the oil pressure switch, the neutral start switch, the reverse light switch, the throttle valve switch, the vacuum cutting solenoid (manual trans.), the cold start valve, the air regulator, the distributor, the boost controlled deceleration solenoid valve, the electronic fuel injection harness and connector.
  4.  

If equipped with a turbocharged engine, remove the vacuum control modulator and the engine oil cooler hoses from the oil filter bracket.

  1. Disconnect the engine ground cable, the high tension coil wire and the terminal block wire.
  2.  
  3. Disconnect the fuel return, the fuel charge, the vacuum and the heater hoses.
  4.  
  5. Connect the engine to a vertical lifting device and support the engine weight.
  6.  
  7. Support the transmission with a floor jack, then remove the engine-to-transmission bolts.
  8.  

If equipped with an automatic transmission, mark the position of the torque converter to the drive plate, then remove the torque converter-to-drive plate bolts.

  1. Remove the engine mounts and lift the engine from the vehicle. Secure the engine to a work stand.
  2.  

To install:
  1. To install, lower the engine into the engine compartment.
  2.  
  3. Support the transmission with a floor jack, then install the engine-to-transmission bolts.
  4.  

If equipped with an automatic transmission, install the torque converter-to-drive plate bolts.

  1. Connect the fuel return, the fuel charge, the vacuum and the heater hoses.
  2.  
  3. Connect the engine ground cable, the high tension coil wire and the terminal block wire.
  4.  
  5. Connect the wiring connectors to the alternator, the starter, the EGR solenoid valve, the oil pressure switch, the neutral start switch, the back-up light switch, the throttle valve switch, the vacuum cutting solenoid (manual trans.), the cold start valve, the air regulator, the distributor, the boost controlled deceleration solenoid valve, the electronic fuel injection harness and connector.
  6.  

If equipped with a turbocharged engine, install the vacuum control modulator and the engine oil cooler hoses to the oil filter bracket.

  1. Connect the accelerator linkage to the throttle body.
  2.  
  3. If equipped with a lower splash guard, install it. Install the radiator and the shroud.
  4.  
  5. If equipped with an automatic transmission, connect the oil cooler lines to the radiator.
  6.  
  7. Install the emission control canister. Connect the fuel lines and the emission control canister hoses.
  8.  
  9. Install the air cleaner and the radiator hoses.
  10.  
  11. If equipped with power steering and/or air conditioning, install the power steering pump and/or the air conditioning compressor.
  12.  
  13. Install and connect the battery, positive cable first, followed by the negative cable.
  14.  
  15. Fill the cooling system and the engine oil.
  16.  
  17. Install the hood.
  18.  

 
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