Question 1

How to remove and install the lower and upper oil pans on V6 Nissan Altima?

Accepted Answer

To remove the lower oil pan, first raise the vehicle and support it securely on jackstands, then remove the under-vehicle splash shield. Loosen the lower oil pan bolts in the reverse order of the tightening sequence and remove them. Use a plastic-face hammer to bump the side of the oil pan to break it loose; if that doesn't work, tap a putty knife or other thin tool between the upper and lower oil pans. Clean all remnants of silicone sealer from the sealing surfaces and wipe them with lacquer thinner to remove traces of oil. Check the lower steel oil pan flange for distortion, particularly around the bolt holes, and if necessary, flatten it using a hammer on a wood block. Apply a bead of RTV sealant around the steel oil pan flange and install the steel oil pan, ensuring it is installed within 15 minutes of applying the sealant. Tighten the oil pan fasteners in several steps to the specified torque. For the upper oil pan, disconnect the cable from the negative terminal of the battery and perform the idle air volume learning procedure when reconnecting. Set the parking brake, block the rear wheels, drain the oil, and remove the oil filter. Raise the front of the vehicle and support it securely on jackstands, then remove the lower oil pan. Remove the engine splash shield and the inner fender splash shields, drain the engine oil, and remove the dipstick and dipstick tube. Drain the coolant, remove the intake manifold collector, engine cooling fan, drivebelt, and front subframe. Unbolt the air conditioning compressor and move it aside without disconnecting the lines. Disconnect the engine coolant tubes from the oil cooler, tape the ends to prevent contamination, and remove the Crankshaft Position sensor and oil pressure switch. Remove the right driveaxle and its center bearing support, then remove the oxygen sensors from the catalytic converters. Remove the rear cover from the upper oil pan, the four bolts attaching the upper oil pan to the transmission, and the upper oil pan bolts in reverse order of the tightening sequence. Use a prying tool to break the oil pan loose and remove it, then take out the two O-rings from the block and the housing of the oil pump, as well as the gaskets from the front timing cover and rear seal retainer. For installation, use a scraper to remove all traces of old gasket material and sealant from the upper aluminum section of the oil pan, lower steel pan, and engine block, cleaning the mating surfaces with brake system cleaner while being careful not to scratch or gouge them. Ensure the threaded bolt holes in the block and aluminum section of the oil pan are clean, then apply a bead of RTV sealant to the ends of the timing chain cover gasket and rear oil seal retainer gasket, placing the gaskets in position on the oil pan. Apply a bead of RTV sealant around the upper aluminum oil pan flange, ensuring installation within 15 minutes of applying the sealant. Install new O-rings in the engine block and oil pump body, carefully position the upper aluminum section of the oil pan on the engine block, and install the bolts, tightening them in three or four steps to the specified torque. Finally, install the transmission mounting bolts, and complete the installation in reverse order of removal, ensuring to install a new oil filter and wait at least 30 minutes after applying the silicone sealer before adding oil.

Question 2

How to remove and install the engine oil pan on Nissan Maxima with SOHC engine?

Accepted Answer

To remove the engine oil pan, first disconnect the cable from the negative terminal of the battery and raise the vehicle securely on jackstands. If equipped, remove the under-vehicle splash pan, then drain the engine oil and remove the oil filter. Unbolt and remove the exhaust Y-pipe from the exhaust system, and detach the bellhousing cover by loosening the bolts. Support the engine/transaxle securely from above with a hoist or a three-bar engine support fixture, then unbolt the front and rear engine mounts from the crossmember and remove the engine-mount crossmember from beneath the oil pan. Remove the oil pan bolts in reverse order of tightening, then detach the oil pan carefully to avoid damaging the sealing surfaces. If the pan is stuck, use a soft-face hammer to dislodge it. Clean all traces of old gasket material and sealant from the engine block and pan with a gasket scraper and a solvent. For installation, ensure the threaded holes in the engine block are clean, apply ATV sealant to the ends of the seals, and position them on the oil pump and rear seal housings. Apply a continuous bead of ATV sealant to the inner sealing surface of the oil pan and install it within five minutes. Tighten the bolts in three or four steps following the specified sequence, then complete the remaining steps in reverse order of removal. Allow at least 30 minutes for the sealant to dry, add oil and a new oil filter, start the engine, and check for oil pressure and leaks.

Question 3

How to remove and install an oil pan on 3.3L V6 Nissan Pathfinder?

Accepted Answer

Disconnect the cable from the negative terminal of the battery. Raise the vehicle and support it securely on jackstands. Remove the engine under-cover (if equipped). Drain the engine oil and remove the oil filter. Unbolt and remove front exhaust pipes from the exhaust system. Also remove the front stabilizer bar and the relay rod. On vehicles equipped with automatic transmissions detach the bellhousing cover. On vehicles equipped with manual transmissions detach the transmission support brace from the left side of the engine. On 2WD models, remove the front suspension crossmember from beneath the oil pan. On 4WD models, remove the front differential. Remove the starter motor. Disconnect the steering relay rod from the idler arm and swing it out of the way. Support it so it isn't hanging by the ballstud at the Pit-man arm. Unbolt the power steering line brackets. Support the engine/transmission securely from above with a hoist. Unbolt the left and right engine mounts from the frame rail brackets and lilt the engine enough to allow clearance for removal of the oil pan. Work carefully and be sure not to wedge any parts such as the accelerator cable against any surrounding components. Remove the oil pan bolts, following the reverse of the tightening sequence. Detach the oil pan. Don't pry between the pan and engine block or damage to the sealing surfaces may result and oil leaks could develop. If the pan is stuck, dislodge it with a soft-face hammer. Use a gasket scraper to remove all traces of old gasket material and sealant from the engine block and pan. Clean the mating surfaces with lacquer thinner or acetone. Also ensure that the threaded holes in the engine block are clean. Apply RTV sealant to the ends of the seal sand position them on the oil pump and rear.seal housings. Apply a continuous 5/32-inch (3.5 mm) bead of RTV sealant to the inner sealing surface of the oil pan. Install the oil pan and tighten the bolts in three or lour steps following the sequence to the specific torque. The remaining installation steps are the reverse of removal. Allow at least 30 minutes for the sealant to dry, add oil and a new oil filter, start the engine and check for oil pressure and leaks.

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