Nissan Pick-ups and Pathfinder 1970-1988

Engine

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REMOVAL & INSTALLATION



1970-83 Vehicles

See Figures 1, 2 and 3

It is much easier to remove the engine and the transmission together as an assembly than to remove only the engine from the engine compartment. After the engine and transmission are removed from the vehicle, the two can be separated.

  1. Disconnect the battery ground cable. Remove the battery.
  2.  
  3. Mark the location of the hood hinges on the body in order to facilitate installation and remove the hood.
  4.  
  5. Remove the air cleaner after disconnecting the PCV hose from the rocker cover.
  6.  
  7. Drain the radiator of coolant and the engine crankcase of oil.
  8.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the 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. Disconnect the upper and lower radiator hoses from the engine. Disconnect and plug the automatic transmission cooler lines at the radiator, if so equipped. Use a flare nut wrench if one is available.
  2.  
  3. Remove the four bolts securing the radiator and remove the radiator from the vehicle.
  4.  
  5. Disconnect the engine ground cable at the cylinder head.
  6.  
  7. Disconnect the electrical leads at the starter, alternator, distributor, the high tension ignition coil cable, and the oil pressure and temperature sending units' wires.
  8.  
  9. Disconnect the fuel line at the fuel pump (or filter on electric pump models), the heater hose at the engine side, and the choke wire and accelerator cable at the carburetor. Disconnect the emission hoses or wires to the carbon canister, air pump, B.C.D.D. solenoid, and fuel cut solenoid; the vacuum hose to the brake booster (on models so equipped), and any other wires or hoses running to the engine. Tag all wires as they are disconnected for assembly.
  10.  
  11. Remove the transmission control linkage from the transmission; in the case of an automatic transmission, remove the cross-shaft assembly from the transmission. Remove the selector rod from the selector lever on the automatic transmission. On manual transmissions, lift the rubber boot and remove the nut or C-clip from the shift lever and detach the shift lever from the transmission.
  12.  
  13. Remove the two bolts securing the clutch slave cylinder. Disconnect the clutch slave cylinder and the flexible tubing as an assembly.
  14.  
  15. Disconnect the speedometer cable and the back-up light wiring (and neutral switch, if equipped) from the rear section of the transmission.
  16.  
  17. Disconnect the exhaust pipe from the exhaust manifold.
  18.  
  19. Disconnect the driveshaft center bearing bracket from the third crossmember of the frame. Disconnect the driveshaft at the differential housing. Remove the driveshaft assembly from the vehicle and plug the rear end of the transmission extension housing to prevent loss of transmission lubricant.
  20.  
  21. Attach a suitable lifting device to the engine and lift the engine slightly.
  22.  
  23. Remove the front engine mount bolts on both sides of the engine.
  24.  
  25. Place a jack under the transmission and lift it slightly.
  26.  
  27. Loosen the two combination engine rear mounting/transmission mounting bolts. On models with a catalytic converter, loosen the two exhaust pipe hanger bolts.
  28.  
  29. On 1972 and later models, remove the four bolts (two on each side) securing the engine rear mounting/transmission support side member and detach the support from the frame.
  30.  
  31. On 1976 and later models, remove the bolts securing the idler arm to the frame, and push down the tie rod.
  32.  
  33. Pull the engine toward the front as far as possible and carefully raise the engine with the transmission up and out of the vehicle.
  34.  
  35. Install the engine in the reverse order of removal, taking note of the following:

    Do not connect any parts of the engine or transmission until the engine and transmission are in place on the engine/transmission mounts and secured by the mounting bolts.
     
    Secure the rear support first and then the front engine mounts, using the upper bolt hole as a guide.
     

  36.  



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Fig. Fig. 1: Remove the C-clip and pin on later models-1970-83



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Fig. Fig. 2: Crossmember removal-1972-83



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Fig. Fig. 3: Idler arm removal-1976-83

1984-86 720-D Series

See Figures 4, 5, 6, 7, 8, 9, 10 and 11

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the engine undercover.
  4.  
  5. Disconnect the windshield washer hose and then remove the hood. Scribe matchmarks around the hinges for easy installation.
  6.  
  7. Drain the engine oil. Drain the engine coolant from the radiator and the cylinder block.
  8.  
  9. Drain the automatic transmission fluid on models so equipped.
  10.  
  11. Disconnect the air cleaner hose and then remove the air cleaner.
  12.  
  13. Remove the radiator and shroud as detailed later in this section. On models with automatic transmission oil coolers, disconnect and plug the oil lines at the radiator
  14.  
  15. Remove the coupling fan.
  16.  
  17. Disconnect the two heater hoses at the engine.
  18.  
  19. Remove the drive belts.
  20.  
  21. Remove the power steering pump from its bracket (if equipped). Disconnect the ground strap from the bracket.
  22.  
  23. On models with air conditioning, loosen the drive belt and remove the air conditioning compressor. Position it out of the way with the refrigerant lines still attached.
  24.  
  25. Remove the transmission control linkage.
  26.  
  27. Disconnect the speedometer cable. Tag and disconnect any electrical leads at the transmission.
  28.  
  29. On models with manual transmission, remove the clutch release cylinder and its bracket from the transmission. Position it aside without disconnecting the hydraulic lines.
  30.  
  31. Remove the bolts and disconnect the exhaust pipe at the manifold.
  32.  
  33. Disconnect and remove the parking brake cable at the brake lever side.
  34.  
  35. Matchmark the rear driveshaft to the transmission flange, then remove the driveshaft. Be sure to plug the hole in the extension housing.
  36.  
  37. Matchmark the front driveshaft (4wd models) to the transfer case flange, then remove the front driveshaft.
  38.  
  39. Attach an engine hoist chain to the lifting brackets on the engine, then raise the engine just enough to ease the weight on the front and rear engine mount insulators.
  40.  
  41. On models with 4wd, carefully slide a floor jack underneath the front differential carrier and remove the front mounting bolt. Remove the rear mounting bolts and crossmember, then slowly lower the carrier.
  42.  
  43. On models with automatic transmission, remove the rear engine mount support-to-body bolts.
  44.  
  45. Remove the mounting bolts for the front engine mount.
  46.  
  47. On models with a diesel engine, turn the steering wheel lock-to-lock a few times and check that there is sufficient clearance between the cross rod and the oil pan.
  48.  
  49. Tighten the engine hoist chain, then carefully lift the engine/transmission assembly up and out of the truck. Be very careful not to bump into anything as the engine comes out of the engine compartment.
  50.  

To install:
  1. Slowly lower the engine/transmission assembly into the engine compartment.
  2.  
  3. Raise the transmission onto the crossmember with a floor jack.
  4.  
  5. Align the holes in the engine mounts and the frame, install the bolts and then remove the engine hoist chain.
  6.  
  7. On models with automatic transmission, install the rear engine mount support-to-body bolts.
  8.  
  9. On models with 4wd, carefully raise the floor jack underneath the front differential carrier, then install the rear mounting bolts and crossmember. Install the front mounting bolt.
  10.  
  11. Install the front driveshaft (4wd models) to the transfer case flange.
  12.  
  13. Remove the plug in the extension housing and the connect the rear driveshaft to the transmission flange.
  14.  
  15. Connect and install the parking brake cable.
  16.  
  17. Install the the exhaust pipe at the manifold.
  18.  
  19. Install the clutch release cylinder and its bracket at the transmission.
  20.  
  21. Connect the speedometer cable. Reconnect any electrical leads at the transmission (check the tags you made in Step 14).
  22.  
  23. Install the transmission control linkage.
  24.  
  25. Install the air conditioning compressor and drive belt.
  26.  
  27. Install the power steering pump and its bracket (if equipped). Be sure to connect the ground strap to the bracket.
  28.  
  29. Install the drive belts.
  30.  
  31. Connect the heater hoses.
  32.  
  33. Install the coupling fan.
  34.  
  35. Install the radiator and shroud. Unplug the automatic transmission oil cooler lines and connect them (if equipped).
  36.  
  37. Install the air cleaner.
  38.  
  39. Refill the engine and automatic transmission with fluid.
  40.  
  41. Install and adjust the hood.
  42.  
  43. Install the engine undercover.
  44.  
  45. Connect the negative battery cable, start the truck and road test it.
  46.  



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Fig. Fig. 4: Removing the transmission control linkage-1984-86 Z20 and Z24 engines (with M/T)



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Fig. Fig. 5: Removing the transmission control linkage-1984-86 Z20 and Z24 engines (with A/T)



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Fig. Fig. 6: Removing the rear engine mount support-1984-86



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Fig. Fig. 7: Front engine mount (left)-1984-86 Z20 and Z24 engines



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Fig. Fig. 8: Front engine mount (right)-1984-86 Z20 and Z24 engines



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Fig. Fig. 9: Front engine mount (left)-1984-86 SD25 engines



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Fig. Fig. 10: Front engine mount (right)-1984-86 SD25 engines



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Fig. Fig. 11: On models with an SD25 engine, make sure there is sufficient clearance between the cross rod and oil pan

1986-88 D21-D Series

See Figures 12, 13 and 14

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the engine undercover.
  4.  
  5. Disconnect the windshield washer hose, then remove the hood. Scribe matchmarks around the hinges for easy installation.
  6.  
  7. Drain the engine oil. Drain the engine coolant from the radiator and the cylinder block.
  8.  
  9. Drain the automatic transmission fluid on models so equipped.
  10.  
  11. Disconnect the air cleaner hose and then remove the air cleaner.
  12.  
  13. Remove the radiator and shroud as detailed later in this section. On models with automatic transmission oil coolers, disconnect and plug the oil lines at the radiator
  14.  
  15. Remove the coupling fan.
  16.  
  17. Disconnect the two heater hoses at the engine.
  18.  
  19. Remove the drive belts.
  20.  
  21. Remove the power steering pump from its bracket (if equipped). Disconnect the ground strap from the bracket.
  22.  
  23. On models with air conditioning, loosen the drive belt and remove the air conditioning compressor. Position it out of the way with the refrigerant lines still attached.
  24.  
  25. Remove the transmission control linkage.
  26.  
  27. On 4wd models, disconnect the starter leads and remove the starter. On 2wd models disconnect the starter motor leads.
  28.  
  29. Disconnect the speedometer cable. Tag and disconnect any electrical leads at the transmission.
  30.  
  31. On models with manual transmission, remove the clutch release cylinder and its bracket from the transmission. Position it aside without disconnecting the hydraulic lines.
  32.  
  33. Remove the bolts and disconnect the exhaust pipe at the manifold.
  34.  
  35. On 4wd models:
    1. Matchmark the front driveshaft (4wd models) to the transfer case flange and then remove the front driveshaft.
    2.  
    3. Carefully slide a floor jack underneath the front differential carrier and remove the front mounting bolt. Remove the rear mounting bolts and crossmember and then slowly lower the carrier.
    4.  
    5. Remove the transmission-to-engine bracket mounting nuts.
    6.  
    7. Remove the mounting bolts for the front engine mounts.
    8.  

  36.  
  37. Attach an engine hoist chain to the lifting brackets on the engine and then raise the engine just enough to ease the weight on the front and rear engine mount insulators.
  38.  
  39. On 4wd models, remove the front differential carrier.
  40.  
  41. On 2wd models:
    1. Matchmark the rear driveshaft to the transmission flange and then remove the driveshaft. Be sure to plug the hole in the extension housing.
    2.  
    3. Remove the transmission-to-rear engine mount bracket bolts.
    4.  
    5. Remove the transmission member.
    6.  

  42.  
  43. On 4wd models, remove the transmission-to-engine mounting bolts.
  44.  
  45. Tighten the engine hoist chain and carefully lift the engine (4wd) or engine/transmission (2wd) assembly up and out of the truck. Be very careful not to bump into anything as the engine comes out of the engine compartment.
  46.  

To install:
  1. Slowly lower the engine/transmission assembly into the engine compartment.
  2.  
  3. Raise the transmission onto the crossmember with a floor jack.
  4.  
  5. Align the holes in the engine mounts and the frame, install the bolts and then remove the engine hoist chain.
  6.  
  7. On 4wd models, install the transmission-to-engine mounting bolts. Tighten the 16mm and 25mm bolts to 22-29 ft. lbs. (29-39 Nm).
  8.  
  9. On 2wd models:
    1. Install the transmission member.
    2.  
    3. Install the transmission-to-rear engine mount bracket bolts and tighten to 30-38 ft. lbs. (41-52 Nm).
    4.  
    5. Install the rear driveshaft to the transmission flange.
    6.  

  10.  
  11. On 4wd models:
    1. Install the front differential carrier.
    2.  
    3. Install the mounting bolts for the front engine mounts and tighten to 23-31 ft. lbs. (31-42 Nm). On models with a diesel engine, tighten the right side to 30-38 ft. lbs. (41-52 Nm) and the left side to 39-52 ft. lbs. (53-71 Nm).
    4.  
    5. Install the transmission-to-engine bracket mounting nuts and tighten to 30-38 ft. lbs. (41-52 Nm).
    6.  
    7. Align the matchmarks on the front driveshaft to those on the transfer case flange and then install the front driveshaft.
    8.  

  12.  
  13. Connect the exhaust pipe to the manifold.
  14.  
  15. Install the clutch release cylinder and its bracket to the transmission.
  16.  
  17. Connect the speedometer cable. Connect any electrical leads at the transmission.
  18.  
  19. On 4wd models, connect the starter leads and install the starter. On 2wd models, connect the starter motor leads.
  20.  
  21. Install the air conditioning compressor and drive belt.
  22.  
  23. Install the power steering pump and its bracket (if equipped). Be sure to connect the ground strap to the bracket.
  24.  
  25. Install the drive belts.
  26.  
  27. Connect the heater hoses.
  28.  
  29. Install the coupling fan.
  30.  
  31. Install the radiator and shroud. Unplug the automatic transmission oil cooler lines and connect them (if equipped).
  32.  
  33. Refill the engine and automatic transmission with fluid.
  34.  
  35. Install and adjust the hood.
  36.  
  37. Install the engine undercover.
  38.  
  39. Connect the negative battery cable, start the truck and road test it.
  40.  



Click image to see an enlarged view

Fig. Fig. 12: Engine mount locations-1986-87 Z24i and SD25 engines



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Fig. Fig. 13: Engine mount locations-1988 Z24i engines



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Fig. Fig. 14: Engine mount locations-1986-88 VG30i engines

 
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