A calibrated nozzle in a carburetor through which fuel is drawn and mixed with
air. A carburetor normally contains several jets (idle, main, power) to provide the proper
combustible mixture for all conditions of engine load and speed.
Cranking the engine of a car with a discharged or weak battery by attaching
cables from the weak battery to a charger or helper battery.
A general term used to describe the sound made by loose or worn mechanical parts
in an engine, such as a bearing.
A type of frame construction consisting of two heavy-section longitudinal members
connected together stepladder fashion by smaller, transverse members. This type of frame
is utilized on all 4x2 Hardbody's.
A windshield consisting of a thin layer of rubbery plastic sandwiched between two
sheets of glass. It is required for any car sold in the United States. Laminated
windshields are safer than tempered glass windshields because damage, unless extensive, is
localized and generally doesn't seriously impair vision. Also, when struck by a large
blunt object, a laminated windshield fractures (or breaks) without puncturing, and the
plastic inner layer holds the glass to reduce splintering.
Lead-Free or Unleaded Gasoline
Gasoline without tetraethyl lead or any other lead compound as an additive to
increase octane rating or to reduce knock or detonation tendencies of the fuel. The
elimination of such additives is one reason for the lowering of compression ratios. All
new vehicles sold in the U.S. require lead-free gasoline.
Limited Slip Differential
A device in the differential that limits the speed difference between the two
wheels. This prevents one wheel from spinning while the other is stationary, and so
improves traction on slippery surfaces. (Also called Posi-Traction, GM trademark and
Traction-Lok, Ford trademark.)
A rigid axle to which both rear wheels are mounted and through which the power is
transmitted. Our Hardbodys and Van use a live rear axle. (Also see: Dead Axle/
Load Sensing Valve
A device that can sense the amount of weight in the bed of a truck and adjust the
amount of braking force to the rear wheels to provide optimum stopping power under all
load situations. This valve is found on all our Hardbodys and Pathfinder.
Lock-Up Torque Converter
A torque converter that contains a special clutch that forms a solid connection
between the engine output shaft and the transmission input shaft when a certain, pre-set
speed is attained. This reduces transmission friction losses and increases efficiency.
(Also see: Torque Converter)
Any substance, but usually oil or grease, that is applied to moving parts to
reduce friction. In an engine, lubricants not only reduce the friction, but also act as a
seal to prevent leakage between parts, such as piston rings and the cylinder. The
lubricant also acts to carry away much of the heat caused by friction and wash away the
abrasive metal worn from friction surfaces.
The oil pump, oil pan, oil coolers, tubing, filters and passages in the block and
other parts that furnish oil to the moving parts and bearings of an engine.
The nuts used to secure the wheels to the vehicle.
A type of suspension that is known for being very efficient and compact. This
suspension system employs a coil spring and shock strut, acting as an integral unit.
Compared to conventional suspension systems, MacPherson struts use fewer parts, meaning a
reduction in weight and elements that could wear out.
Large insert type bearings that mount in an engine block and support the
A type of seat that by its construction allows the manufacturer to avoid the use
of seams in the seat covering.
A chamber attached to the exhaust pipe in which the exhaust gases expand and
cool. It is usually fitted with baffles or porous plates that reduce, or muffle, the noise
created by the exhaust.
Multi Link Rear Suspension
A system, generally employed only on driven wheels, in which a number of
"links" are used to give vertical, lateral and fore-art support to the wheels.
This system can be "tuned" or adjusted to give excellent steering
characteristics during acceleration, braking and lateral G forces.
NAPS-X and NAPS-Z Engines
This is the designation for Nissan engines that feature optimum combustion for
performance and economy with a low amount of exhaust emission. NAPS stands for Nissan
Anti-Pollution System, which is protected by over 250 patents. These engines feature a
"hemi" head combustion chamber and two spark plugs per cylinder. The NAPS-Z
engine is used in four-cylinder Hardbodys and Van while the NAPS-X engine is used on the
Stanza. (The term NAPS is no longer used in Nissan literature.)
Nissan Direct Ignition System (NDIS)
A system in which a separate ignition coil is supplied for each cylinder -- with
one coil placed directly over each spark plug. In the Nissan system, each coil is
controlled by a separate power transistor that is actuated by the E.C.C.S. electronic
control unit. The Pulsar NX SE features this system.
Nissan Induction Control System (NICS)
A system used in multi-valve engines (such as the CAI8DE engine in the Pulsar NX
SE model) in which there are two intake ports per cylinder. One port is open all the time.
The second port opens, by way of a butterfly valve, only during high r.p.m. operation.
This system provides driveability at low engine speeds and good power at high r.p.m. by
maintaining high air velocity through the intake system. (Also see: Dual Plenum Intake
Oxides of nitrogen. NOx is produced when gasoline is burned in an engine. It
constitutes one of the ingredients of photochemical smog. NOx emissions can be reduced by
lowering peak combustion temperatures; two ways of accomplishing this are by lowering the
compression ratio and by recirculating the exhaust gases.
An instrument for measuring and registering the miles and tenths of miles driven.
Some cars also have an additional trip odometer, which can be reset to zero for
conveniently measuring the miles driven during trips or between fuel fill-ups.
An engine-driven pump that delivers oil to all the moving engine parts.
In the five-speed manual transmission, the fifth gear is built into the gearbox
as a true overdrive. This means the driveshaft turns faster than the engine crankshaft.
The overdrive feature saves fuel, and because the engine runs slower, engine wear and
noise are reduced.
Overhead Cam (OHC)
An engine where the camshaft is located above the combustion chamber in the
cylinder head, instead of in the cylinder block. Such a design allows the valves to
respond more quickly to the needs of the engine. In addition, potential wear is reduced
because there are fewer moving valvetrain parts. An engine that has one overhead camshaft
operating all the valves is called a single overhead camshaft engine (SOHC). If the engine
has one cam actuating the intake valves and another for the exhaust valves, it is known as
a dual overhead camshaft engine (DOHC) or twin-cam engine.
An engine with both intake and exhaust valves placed directly over the piston. In
this design, the camshaft is located in the block, and the valves are actuated by pushrods
and rocker arms.