Glossary “SPST” Definition:
Single Pole Single Throw
s
spun bearing
Glossary “spun bearing” Definition:
Any bearing on the crankshaft that has seized on the journal and turned in the housing bore. Wheel bearing that has siezed and spun in the hub.
sprocket pitch diameter
Glossary “sprocket pitch diameter” Definition:
Pitch diameter of a sprocket used in a synchronous belt drive that coincides with the belt pitch line and is always greater than the sprocket outside diameter.
sprocket pitch
Glossary “sprocket pitch” Definition:
Dimension between the centers where the rollers would be bedded against the bottoms of adjacent tooth spaces.
spring walk
Glossary “spring walk” Definition:
Tendency of a valve spring to bounce around in its seat at high-engine speed.
spring windup
Glossary “spring windup” Definition:
The slight S-shape assumed by the leaf spring during extreme acceleration and braking that may be controlled by traction bars on high-performance vehicles.
sprocket
Glossary “sprocket” Definition:
Disk with teeth around its outer perimeter that mesh with a belt or chain.
spring scale
Glossary “spring scale” Definition:
Measuring device commonly used to check articulation effort of tie rods, rack and pinion assemblies and steering gear rotating effort. Contains a calibrated spring that compresses a known amount under a given load.
spring seat
Glossary “spring seat” Definition:
Recess in a chassis where a coil spring is mounted.
spring shackle
Glossary “spring shackle” Definition:
A small, swing-arm attachment at the rear of the leaf spring to allow the spring to flex.
spring tester
Glossary “spring tester” Definition:
Measures the amount of force required to compress a valve spring at its installed height. Weak valve springs cause poor engine performance and must be replaced.
spring torque windup
Glossary “spring torque windup” Definition:
Term used for a Hotchkiss drive.
spring retainer
Glossary “spring retainer” Definition:
Element which locates and provides reaction for the spring in a one-way roller clutch.
spring sag
Glossary “spring sag” Definition:
Loss of spring load due to overloading and/or metal fatigue.
spring rate
Glossary “spring rate” Definition:
Relationship of spring deflection to load applied, such as the amount of weight, in pounds, required to deflect the rear spring.
spring load
Glossary “spring load” Definition:
A measure, in pounds or kilograms, of how much weight a spring can support, generally at the installed height.
spring oscillation
Glossary “spring oscillation” Definition:
Continued compression and rebound motion of a spring, after the wheel has encountered a bump or hole on the road surface, which diminishes gradually, depending on the condition of the shock.
spring pin
Glossary “spring pin” Definition:
Small piece of metal rolled in a pin-like manner that is used to dowel small parts that may occasionally have to be disassembled and reassembled.
spring leaf insert
Glossary “spring leaf insert” Definition:
Small, replaceable composition pads placed between the spring leaves near the ends to aid in slippage between the leaves while they are flexing.
spring hanger
Glossary “spring hanger” Definition:
Vehicle frame bracket for the eye at the front of the rear leaf spring.