This Chilton repair manual covers 1998-2004 Nissan Frontier pick-up trucks, 2000-2004 Xterra, and 1996-2004 Pathfinder, 2WD and 4WD, U.S. and Canada models with 4-cylinder and V6 engines. Note: This manual does not include info specific to supercharged engine models.
Book Excerpt: 1998-2004 Nissan Frontier Pick-Up Truck, Xterra, Pathfinder Repair Manual 3.3L V6 ENGINE

EXHAUST MANIFOLDS | REMOVAL AND INSTALLATION CAUTION! The engine must be completely cool before beginning this procedure. REMOVAL
(Refer to illustrations 10.3, 10.6 and 10.7)

1. Disconnect the cable from the negative terminal of the battery. Raise the front of the vehicle and support it on jackstands.
2. Spray penetrating oil on the exhaust manifold fasteners and allow it to soak in.
3. Working under the vehicle, disconnect the front exhaust pies from the vehicle (see Chapter 4).
NOTE: On California models, detach the heat shields from the pre-catalytic converter, disconnect the oxygen sensor connectors and remove the pre-cat from the exhaust manifold (see illustration). If both exhaust manifolds are being removed, both pre-catalytic converters or front exhaust pipes must be removed. On 2WD models, remove the front suspension crossmember first, to facilitate removal of the front exhaust pipes. LEFT MANIFOLD
4. Remove the air intake duct and the top half of air cleaner housing as an assembly from the throttle body (Chapter 4).
5. Disconnect the EGR flare tube from the exhaust manifold.
6. Remove the bracket holding the engine oil dipstick. Remove the heat shield from the manifold (see illustration) to provide access to the manifold fasteners, and remove the upper row of manifold nuts. Work from the ends toward the middle when removing the manifold fasteners.
7. Working from below, remove the lower row of manifold fasteners and remove the manifold from the engine (see illustration).
RIGHT MANIFOLD
8. Working from above, remove the manifold heat shield. Remove the upper row of manifold nuts. Work from the ends toward the middle when removing the manifold fasteners. Working from below, remove the lower row of manifold fasteners and remove the manifold from the engine.
INSTALLATION
9. Carefully inspect the manifolds and fasteners for cracks and damage.
10. Use a scraper to remove all traces of old gasket material and carbon deposits from the manifold and cylinder head mating surfaces. If the gasket was leaking, have the manifold checked for warpage at an automotive machine shop and resurfaced if necessary.

Subject: 1998, 1999, 2000, 2001, 2002, 2003, 2004 Nissan Frontier Pick-Up Truck, Xterra, Pathfinder service, maintenance, repair. ISBN-10: 1563926520 | ISBN-13: 9781563926525 | Chilton 52503