### Exhaust Manifold

#### REMOVAL AND INSTALLATION

##### 1.6L (GA16DE) and 2.0L (SR20DE) Engine

###### 1993-94 Sentra

NOTE: If any fuel system components must be removed, be sure to relieve the fuel system pressure first.

1. Disconnect the negative battery cable. Raise and support the vehicle safely.
2. Remove the undercover and dust covers, if equipped.
3. Remove the air cleaner or collector assembly, if necessary for access.
4. Remove the heat shield(s), if equipped.
5. Disconnect the exhaust pipe from the exhaust manifold.
6. Remove or disconnect the temperature sensors, oxygen sensors, air induction pipes.
7. Remove manifold support brackets.
8. Disconnect the EAI and EGR tubes from their fittings if so equipped.
9. Loosen and remove the exhaust manifold attaching nuts and remove the manifold(s) from the block. Discard the exhaust manifold gaskets and replace with new.
10. Clean the gasket surfaces and check the manifold for cracks and warpage.

    To install:

11. Install the exhaust manifold with a new gasket. Torque the manifold fasteners from the center outward in several stages.
12. Connect the EAI and EGR tubes to the connections on the manifold as necessary.
13. The remaining components are installed in the reverse order from which they were removed.
14. Install the undercovers and dust covers.
15. Connect the negative battery cable.

###### 1995-97 Sentra and 200SX

1. Disconnect the negative battery cable. Raise and support the vehicle safely.
2. Remove the engine undercovers.
3. Remove the air cleaner or collector assembly.
4. Remove the heat shields from the manifold and front exhaust pipe.
5. Disconnect the front exhaust pipe from the exhaust manifold.
6. Remove or disconnect the temperature sensors, oxygen sensors, air induction pipes from the manifold.
7. Remove manifold support brackets.
8. Loosen and remove the exhaust manifold attaching nuts and remove the manifold from the block. Discard the exhaust manifold gaskets.
9. Clean the gasket surfaces and check the manifold for cracks and warpage.

   To install:

10. Install the exhaust manifold with a new gasket. Torque the manifold fasteners as follows from the center outward in several stages.
    1. GA16DE engines -- Tighten mounting nuts with washers to 12-15 ft. lbs. (16-21 Nm).
    2. SR20DE engines -- Tighten mounting nuts with washers to 27-35 ft. lbs. (37-48 Nm).
11. Install or connect the temperature sensors, oxygen sensors and air induction pipes.
12. Install the manifold support brackets.
13. Connect the exhaust pipe to the manifold using a new gasket. Tighten the manifold nuts to 21-25 ft. lbs. (28-33 Nm) for GA16DE engine models or 32-37 ft. lbs. (43-50 Nm) for SR20DE engine models.
14. Install the heat shields.
15. Install the air cleaner or collector assembly.
16. Install the engine undercovers.
17. Connect the negative battery cable.
18. Start the engine and check for exhaust leaks.

##### 2.4L (KA24DE) Engine

1. Disconnect the negative battery cable.
2. Raise and safely support the vehicle.

   NOTE: Before loosening the exhaust pipe retaining nuts or bolts, soak the retaining nuts or bolts with penetrating oil.

3. Disconnect the exhaust pipe from the exhaust manifold.

   NOTE: On California models equipped with A/T and on all M/T equipped models, disconnect the exhaust pipe at the exhaust manifold collector.

4. Disconnect the oxygen sensor electrical connector.
5. Remove the exhaust manifold cover.
6. Remove the EGR tube from the exhaust manifold.
7. Remove the exhaust manifold-to-engine bolts and nuts and discard the gaskets. Remove the retaining bolts and nuts in reverse of the tightening sequence.

   Fig. 1: Exhaust manifold bolt tightening sequence -- 2.4L (KA24DE) engine (except California models)

   Fig. 2: Exhaust manifold bolt tightening sequence -- 2.4L (KA24DE) engine (California models)

8. Remove the exhaust manifold from the vehicle.

   To install:

9. Clean all gasket mounting surfaces and install new gaskets.
10. Install the exhaust manifold to the engine and torque the new nuts to 27-35 ft. lbs. (37-48 Nm). Tighten the bolts and nuts evenly in sequence until snug; now torque the bolts and nuts in sequence to specification.
11. Install the EGR tube to the exhaust manifold, tighten the EGR tube nuts to 29-36 ft. lbs. (39-49 Nm).
12. Install the exhaust manifold cover.
13. Torque the exhaust manifold cover bolts to 12-14 ft. lbs. (16-19 Nm) for 1993-94 vehicles. Torque the exhaust manifold cover bolts to 46-57 inch lbs. (5-7 Nm) for 1995-96 vehicles.
14. Connect the oxygen sensor electrical connector.
15. Using a new gasket, connect the exhaust pipe to the exhaust manifold and tighten the mounting nuts/bolts to 33-44 ft. lbs. (45-60 Nm).
16. Connect the negative battery cable.
17. Start the engine and check for exhaust leaks.

##### 3.0L (VE30DE) Engine

Fig. 3: Left exhaust manifold tightening sequence -- 3.0L (VE30DE) engine

Fig. 4: Right exhaust manifold tightening sequence -- 3.0L (VE30DE) engine

1. Disconnect the negative battery cable.
2. Raise and safely support the vehicle.

   NOTE: If necessary, soak the exhaust pipe retaining bolts with penetrating oil to loosen them.

3. Disconnect the exhaust manifolds from the exhaust pipes.
4. Remove the exhaust manifold-to-engine bolts, in the reverse sequence of tightening. Discard the gaskets.

   To install:

5. Clean all gasket mounting surfaces. Install new gaskets.
6. Install the exhaust manifold to the engine and perform the following procedure:
   1. Torque the exhaust manifold-to-engine bolts, in sequence, to 13-16 ft. lbs. (16-22 Nm).
   2. Torque the exhaust manifold-to-engine bolts, in sequence, to 17-20 ft. lbs. (24-27 Nm).
7. Install the exhaust manifolds to the exhaust pipes.
8. Connect the negative battery cable. Start the engine and check for exhaust leaks.

##### 3.0L (VG30E) Engine

1. Disconnect the negative battery cable.
2. Raise and safely support the vehicle.

   NOTE: If necessary, soak the exhaust pipe retaining bolts with penetrating oil to loosen them.

3. Disconnect the exhaust manifolds from the exhaust pipes.
4. Remove both exhaust manifolds-to-engine bolts, in sequence. Discard the gaskets.

   To install:

5. Clean all gasket mounting surfaces. Install new gaskets.
6. Install the exhaust manifolds to the engine and torque the exhaust manifold-to-engine bolts, alternately in 2 stages, in the exact reverse order of removal to 13-16 ft. lbs. (16-22 Nm).
7. Install the exhaust manifolds to the exhaust pipes.
8. Connect the negative battery cable. Start the engine and check for exhaust leaks.

##### 3.0L (VG30DE and VG30DETT) Engines

1. Disconnect the negative battery cable.
2. Raise and safely support the vehicle.
3. Disconnect the exhaust manifolds from the exhaust pipe.
4. Disconnect the oxygen sensor(s) electrical connections.
5. If equipped, remove the turbocharger assembly and three-way warm up catalyst from the exhaust manifold.
6. Remove the exhaust manifold cover(s).
7. If removing the left side exhaust manifold, remove the EGR tube.

   NOTE: Before loosening the exhaust manifold retaining nuts, soak the retaining nuts with penetrating oil.

8. Remove the retaining nuts from the exhaust manifold. Loosen all the retaining nuts evenly
9. Remove the manifold from the vehicle.

   To install:

10. Clean all gasket mounting surfaces and install new gaskets.
11. Install the exhaust manifold to the engine and torque the exhaust manifold-to-engine retaining nuts to 17-20 ft. lbs. (24-27 Nm) on non turbo engines, and torque retaining nuts to 20-23 ft. lbs. (27-31 Nm) on turbo engines.
12. If equipped, install the turbocharger and three-way catalyst assembly to the exhaust manifold.
13. Torque the turbocharger bolts to 32-40 ft. lbs. (43-54 Nm). Torque the three-way catalyst bolts and nuts to 18-22 ft. lbs. (25-29 Nm).
14. Reconnect the oxygen sensor(s) electrical connectors.
15. If removed, reconnect the EGR tube to the EGR valve and the left side exhaust manifold. Torque the EGR tube to EGR valve nut to 25-33 ft. lbs. (34-44 Nm).
16. Install the exhaust manifold covers.
17. Reconnect the exhaust pipe to manifold.
18. Lower the vehicle.
19. Connect the negative battery cable.
20. Start the engine and check for exhaust leaks.

##### 3.0L (VQ30DE) Engine

1. Disconnect the negative battery cable.
2. Raise and safely support the vehicle.

   NOTE: If necessary, soak the exhaust pipe retaining nuts with penetrating oil to loosen them.

3. Disconnect the exhaust manifolds from the exhaust pipes.
4. Remove the protective covers from the manifolds.
5. Remove the exhaust manifold-to-engine mounting nuts. Remove the manifolds from the engine an discard the gaskets.

   To install:

6. Clean all gasket mounting surfaces. Install new gaskets.
7. Install the exhaust manifold to the engine and tighten the mounting nuts in two progressive steps to 22-24 ft. lbs. (30-32 Nm).
8. Install the protective shields and tighten the mounting bolts in two progressive steps to 46-57 inch lbs. (5-7 Nm).
9. Install the exhaust manifolds to the exhaust pipes and tighten the mounting nuts to 32-37 ft. lbs. (43-50 Nm).
10. Connect the negative battery cable, start the engine, and check for exhaust leaks.