- Public Service Commission
- (PSC) the state body which regulates utilities and for-hire trucking operations within a state's boundaries. Also called Public Utilities Commission
- Public Street
- Publicly owned facility-providing access, including the roadway and all other improvements, inside the right-of-way.
- Public Utilities Commission
- (PUC) The state body which regulates utilities and for-hire trucking operations within a state's boundaries.
- PUC
- Acronym for Public Utilities Commission The state body which regulates utilities and for-hire trucking operations within a state's boundaries.
- Puddle jumper
- A colloquial term for a small car. It was used in North America when most cars were very large and was representative of the VW, Austin, Nash Metropolitan, etc.
- Puddle lamp
- A lamp in the bottom of a luxury car door which illuminates the area into which a passenger is going to step when the door is opened
- Pull
-
- The action of a vehicle to deviate towards the side. There may be various causes for a vehicle pulling to one side or the other, the most common being the brakes on either side exerting uneven pressure, incorrect wheel alignment, uneven tire tread, or a defect in the steering system.
- The tendency of a car to pull or lead to one side when brakes are applied.
- Puller
- A device for separating two Components which are secured by Press fitting them.
- Pulley
-
- A grooved wheel carrying a string, rope, Chain, or belt which turns the wheel.
- Flat wheel with a V groove. When attached to a drive and drive members, the pulley provides a means for driving the compressor.
- Pulling beam
- A hydraulic ram attached securely to the vehicle at strong points; pulling force is then applied to the pulling beam to pull the frame or sheet metal back into place
- Pulling post
- A post bolted to the shop floor or secured in a concrete foundation which forms the anchor for the chain and hydraulic jack assemblies to straighten misaligned bodies
- Pull-in torque
- The maximum constant torque that a synchronous electric motor will accelerate into synchronism at rated voltage and frequency
- Pull it down
- A term often used in reference to dismantling and Overhauling an engine. Same as tear it down.
- Pull out
-
- To drive away from the side of a road.
- To drive out from behind a vehicle in front in order to overtake (i.e., pass)
- Pull-out door handle
- An outside door handle which is pulled away from the door skin to open the door
- Pullover point
- The location of the main circuit discharge in the venturi, which is always higher than the fuel level in the bowl so fuel wont run into the venturi when it shouldn't. Spillover is determined by the size of the venturi and by the displacement of the engine pulling air through the carburetor. Also called Spillover point
- Pull Trailer
- A short, full trailer (supported by axles front and rear) with an extended tongue
that attaches with either a ball or a pintle hitch.
Also see
- Pull-type clutch
- A clutch in which the clutch release bearing is pulled away from the flywheel when
the clutch is disengaged.
Also see
- Pull-up torque
- The minimum torque delivered by an AC motor during the period of acceleration from zero to the speed at which breakdown occurs. For motors which do not have a definite breakdown torque, the pull-up torque is the minimum toque developed during the process of getting up to the rated speed
- Pulp chips
- Timber or residues processed into small pieces of wood of more or less uniform dimensions with minimal amounts of bark.
- Pulping liquor
- (black liquor) The alkaline spent liquor removed from the digesters in the process of chemically pulping wood. After evaporation, the liquor is burned as a fuel in a recovery furnace that permits the recovery of certain basic chemicals.
- PULSAIR
- A GM system similar to the Air Injection Reaction System (AIR) except there is no Air pump. Instead Exhaust pressure pulses draw air into the Exhaust system. Fresh air that is filtered by the Air cleaner is supplied to the system on a command from the ECM.
- Pulsation damper
- A device used to smooth out the pulsations or surges of fuel from the
Fuel pump to the
Carburetor.
Also see
- Pulse
- Term referring to one cycle of ignition and combustion of a gas-air mixture in a pulse
combustion furnace.
Also see
- Pulse air principle
- The method, in air induction systems of introducing secondary air into the exhaust system by means of aspirator valves actuated by the pressure pulses of the exhaust gas stream
- Pulse air system
- An air induction system using the Pulse air principle. An exhaust emission control system that uses exhaust pulse in a pipe to permit air to be drawn into exhaust system
- Pulse arc welding
- A type of welding arc in which the arc welding current is interrupted or pulsed as the welding arc progressed.
- Pulse combustion process
- Repeated ignition of a gas and air mixture in a high efficiency gas furnace.
- Pulsed injection
- A system that delivers fuel in intermittent pulses by the opening and closing of solenoid-controlled injectors. Also called Electronic fuel injection (EFI)
- Pulse furnace
- Furnace which has a tuned (resonant) combustion chamber. Part of the energy normally lost through flue is returned to start next pulse of combustion.
- Pulse generator
- The pick-up and reluctor assembly. Generates an electrical pulse which
triggers the electrical control unit or igniter. Also called a pulse signal
generator.
See
- Pulser coil
-
See
- Coil.
- Pulse time
- The measurement, in milliseconds, of the duration of the signal that activates the fuel injector. In other words, the amount of time that an injector is energized. The duration or pulse width is related directly to the amount of fuel injected into the combustion chamber. Also called Pulse width
- Pulse vacuum hublock
- This is a new scheme of switching the hubs in a four-wheel-drive vehicle using a pulse of vacuum rather than electrical solenoids, which are heavier and more prone to failure.
- Pulse width
- The measurement, in milliseconds, of the duration of the signal that activates the fuel injector. In other words, the amount of time that an injector is energized. The duration or pulse width is related directly to the amount of fuel injected into the combustion chamber. Also called Pulse time
- Pulse-width modulated
- (PWM) A continuous on-and-off cycling of an actuator for a fixed number of times per second. Pulse width is usually measured in milliseconds.
- Pulse width modulation valve
- A normally closed valve, used in some Kelsey Hayes systems on GM vehicles, that opens to release hydraulic pressure from the wheel brake during an ABS stop
- Pump
-
- As a verb, it means to move something energetically up and down.
- A device for moving liquid or gas by decreasing or increasing the pressure on it.
Also see- Accelerator pump
- Air pump
- Auxiliary Acceleration Pump
- Bag Pump
- Booster Pump
- Canned motor pump
- Centrifugal pump
- Circulating pump
- Diaphragm pump
- Distributor Injection Pump
- Eccentric rotor pump
- Electric fuel pump
- Electro-hydraulic Pump
- External vane pump
- Feed pump
- Fixed Displacement Pump
- Floor pump
- Foot pump
- Frame Pump
- Fuel injection pump
- Fuel pump
- Fuel pump shut-off switch
- Fuel pump switch
- Gasoline pump
- Gas pump
- Gear-type oil pump
- Gear pump
- Heat Pump
- High-vacuum Pump
- Hydraulic pressure pump
- Impeller pump
- In-line pump
- Injection pump
- Internal gear pump
- Jerk pump
- Liquid pump
- Low-head pump
- Low-pressure pump
- Lubrication pump
- Mixed-flow pump
- Multi-stage pump
- Multi-suction pump
- Non-self-priming pump
- Oil pump
- Oil pumping
- Oil pump strainer
- Petrol pump
- Piston charging pump
- Plunger pump
- Power steering pump
- Primary pump
- Propeller pump
- Pumping the gas pedal
- Radial-flow pump
- Reciprocating Single Piston Pump
- Roller-vane pump
- Rotary Injection Pump
- Rotary pump
- Rotor pump
- Rotor-type Oil Pump
- Scavenger Pump
- Scavenging pump
- Screw Pump
- Secondary pump
- Self-priming pump
- Sliding-vane pump
- Supply Pump
- Transfer Pump
- Twin diaphragm pump
- Two-stage pump
- Vacuum pump
- Vane pump
- Water pump
- Windshield washer pump
- Pump down
-
- The act of using a compressor or a pump to reduce the pressure in a container or a system.
- Evacuate
- Pump gasoline
- Normal gasoline (whether regular or premium) available at service stations in contrast with racing fuel obtained from specialty locations.
- Pumping losses
- That part of engine power which is expended on the induction of the fuel and air charge into the engine and the expulsion of combustion gases
- Pumping the brakes
- A method of repeatedly applying the brakes so that optimum braking can be established without creating brake fade. In anti-lock brakes, this procedure is unnecessary.
- Pumping the gas pedal
- Forcing the Accelerator up and down in an endeavor to provide extra Gasoline to the Cylinders, this is often the cause of Flooding. It is especially harmful to cars with Fuel injection.
- Pumping the throttle pedal
- Forcing the Accelerator up and down in an endeavor to provide extra Gasoline to the Cylinders, this is often the cause of Flooding. It is especially harmful to cars with Fuel injection.
- Pump inlet check ball
- A steel ball located in the plunger head or in the bottom of the accelerator pump well. The pump inlet check ball prevents fuel from escaping from the well when the throttle is opened and pressure is exerted on the fuel in the pump well by the accelerator pump piston
- Pumpkin driver
- Trucker slang for a driver for Schneider National as in "There's a pumpkin driver ahead."
- Pump-Line-Nozzle Fuel System
- A fuel system using a single injection pump driven off the geartrain on the front of the engine that also drives the camshaft. The central injection pump feeds a separate injection nozzle located in the cylinder head above each cylinder. Lines which must be of exactly equal length link each pump plunger with the associated nozzle. Each nozzle incorporates a needle valve and the orifices which actually handle atomization.
- Pump, reciprocating single piston
- A pump having a single reciprocating (moving up and down or back and forth) piston.
- Pump rotor
- A centrifugal pump assembly consisting of the pump shaft, impeller and further rotating components, such as rotating hearing and shaft sealing parts
- Pump sag
- A hesitation in carburetor performance between the time the accelerator pump squirts fuel into the venturi and the point at which the main fuel circuit is activated
- Pump shaft
- A shaft which transmits the driver torque to the impeller(s) of centrifugal pumps or to the displacement element(s) of rotary pumps
- Punch
-
- A tool for making holes or driving out bolts, rivets and pins.
- To perforate by pressing a non-rotating tool through the work.
- To accelerate a vehicle by rapidly pressing down on the throttle
- Punch list
- A list of work items kept by an engineer to ensure that all jobs are completed on a project. Similar to a check list.
- Puncture
- A penetration of a tire's air chamber by a foreign object, nail, glass, etc. resulting in loss of air. Such loss can be rapid with the collapse of the innertube, or relatively slow in the case of tubeless tires.
- Pup Trailer
- A short semitrailer, usually between 26 and 32 feet long, with a single axle. Used in combination with
a dolly and another semitrailer to create a twin trailer. Sometimes used to refer to a short semitrailer
not in twin combination.
Also see pull trailer
- PUR
- Acronym for Polyurethane
- Purchase option
- Most closed-end leases grant the lessee an option to purchase the vehicle at the end of the lease. The end-of-lease purchase price is usually the same as the stated residual value. Check your lease contract before signing to ensure that there is a purchase option. The lessor must disclose the purchase option price prior to your signing the lease contract.
- Purchase price
- The price of a vehicle that the consumer pays. Start with the MSRP and subtract any manufacturer discount and dealer discount you negotiate. Purchase price is a key determinant of the true cost of a lease. Purchase price less your down payment and dealer participation equals the net capitalized cost.
- Purchasing
- Total materials purchased for manufacturing/assembly into auto parts (i.e., steel, plastics, rubber, textiles, etc.).
- Pure-dirt
- Bikes intended for off-road use that are not legal to ride on public roads. Sometimes the term pure-dirt is used to distinguish a dirtbike from a dual-sport motorcycle
- Purge control valve
- (PURGE CV) used to control the release of fuel vapors from the charcoal canister into the engine
- PURGE CV
- Acronym for Purge control valve
- Purge solenoid
- A device used to control the operation of the purge valve in an evaporative control emission system
Also see
- Purge Test
- A test used to determine if fuel vapors are properly drawn from the evaporative canister and the fuel tank into the engine for combustion. If the purge system is not working properly, the evaporative canister can become saturated and vent hydrocarbons into the atmosphere.
- Purge Time
- The period of time intended to allow for the dissipation of any unburned gas or residual products of combustion.
- Purging
-
- Releasing compressed gas to atmosphere through some part or parts for the purpose of removing contaminants from that part or parts.
- Thorough evacuation of the air conditioning system
- Purifier
- A machine used for a liquid-liquid separation in which the two intermixed liquids which are insoluble in each other have different specific gravities. Solids with specific gravities higher than those of the liquids can be separated off at the same time. A purifier bowl has two outlets; one for the light phase liquid and one for the heavy phase liquid.
- Purple gasoline
- Gasoline that has been mixed with an identifying dye (usually purple) and sold for less in order to help farmers. In most places where this is practiced, it is illegal to use purple gasoline in non-farm vehicles. Also called farm gas.
- Push
- A colloquial term for Understeer.
- Push-button
- A switch which is engaged by pushing a button in. In most cases there are several Button options so that when one is selected, the previously selected button is pushed back out (de-selected).
- Pushbutton
- A switch which is engaged by pushing a button in. In most cases there are several Button options so that when one is selected, the previously selected button is pushed back out (de-selected).
- Pusher axle
- A non-powered axle placed ahead of the drive axle in large trucks. Contrasted with a Tag axle which is placed behind the drive axle.
- Push rod
- The rod that connects the Valve lifter to one end of the Rocker arm. Used on valve-in-head installations where the cam is below the Piston and the valves are above the piston. The rods are moved by the cam and activate the valve lifter. Engines with overhead cams do not need push rods because the Camshaft connects to the valves directly.
- Pushrod engine
-
An engine configuration where the camshafts are located lower in the engine. Connecting rods and other components are used to operate the valves at the top of the cylinder heads
Click image to supersize
Pushrod engine
- Pushrod measuring tool
- A tool which measures the length of pushrod needed in an engine; a pushrod of proper length is vital to keep the rocker in the center of the valve, minimize the risk of breakage and extend the valve guide life
- Push start
- A procedure of starting a vehicle with a manual transmission by pushing the vehicle with another vehicle or by the power of several strong people or by coasting downhill. Once sufficient speed is obtained and the clutch is disengaged (the pedal or lever is pushed in) and the transmission in second gear, then engaging the clutch. At this point, the engine will turn over and start. This procedure will not work with a vehicle with an automatic transmission. The British term is bump start
- Push-type clutch
- A conventional clutch in which the clutch release bearing is pushed towards the flywheel when the clutch is disengaged. Compare Pull-type clutch
- Put the pedal to the metal
- Trucker slang for accelerate, speed up as in "Let's put the pedal to the metal."
- Putty
- A malleable cement or paste used for repairing minor panel imperfections, e.g., chips or
scratches on the filled surface; it is used after normal filling and gives an extremely smooth
surface.
Also see