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Q: What is the difference between deflection and idler pulley?
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What is the difference between a pulley and a sheave?

A pulley has a bearing that it rides on and a sheave wheel usually has a brass sleeve in it to ride on. A pulley usually has a higher rpm and can take more stress than a sheave wheel. Sheave wheels can have bearings in them, but open ones as opposed to sealed ones in a pulley. Again this has to do with the amount of load required.It is possible there is no difference. Sailors usually call the 'pulleys' on their boats. 'sheaves'. pronounced 'shivs'. Anyway, the word 'sheave' in English originated in German and means 'pulley'. so go figure.*************OK, so here's a 30-year mechanic's answer. Regardless of what the original terminology was, I believe it has come to mean this: A sheave is a pulley wheel (now referred to as a pulley without the word wheel) that has a grooved circumference. Its original purpose was to transmit and/or multiply mechanical power because it is part of a lever system. A pulley also transmits power, but it is not grooved. Examples: 1) the idler pulley of your car engine, which usually acts as a spring loaded belt tensioner. 2) the guide pulley (known as a sprocket) that shifts the chain from one sprocket to another on the back of a bicycle. 3) the drive belt pulley on a farm tractor used to power old fashioned implements. None of these have grooves.So, a sheave is a pulley, but a pulley is not a sheave. Either word should get your point across. It has nothing to do with bearings versus bushings. BTW, a "bushing" used as a load bearing surface is really a bearing, it's just not a roller, tapered roller or ball bearing, but that's another argument.


Related questions

Where is idler pulley on 1998 Ford Escort 1.9 engine?

The idler pulley is between the alternator and the A/C compressor.


How do you remove and install a 1998 Nissan altama idler tension pulley The pulley the space between the pulley and body of car is only about an inch does not have enough room to pullout?

The idler pulley is mounted on a plate that needs to be removed. In order to remove the plate with the idler pulley, you must remove the engine mount to get out the idler pulley. To remove the engine mount, you need to jack-up the engine from the bottom of the oil pan (Note: place a piece of wood plank between the bottom of the oil pan and the jack). The idler pulley is mounted on a plate that needs to be removed. In order to remove the plate with the idler pulley, you must remove the engine mount to get out the idler pulley. To remove the engine mount, you need to jack-up the engine from the bottom of the oil pan (Note: place a piece of wood plank between the bottom of the oil pan and the jack).


Where is the idler pulley on a 1996 Chevy Cavalier?

I don't believe there is an idler pulley on that model, just a tensioner pulley


Can the idler pulley be the problem on my car because when i brake the car dies?

The idler pulley has nothing to do with the brakes. If the idler pulley is bad it could throw or break a belt, and then your engine will stop.


How does the idler pulley look on a jeep motor?

In an Inline 6 Jeep engine, the idler pulley is located to the right of the A/C pulley. It is a smooth pulley, not a grooved one.


WHAT PULLEY DO I loosen to get single drive belt on?

If you are referring to the Serpentine belt, you loosen no pulley. You simply remove tension from the belt. The tension is applied by the Idler Pulley. Pry the idler back and remove the belt.If you are referring to the Serpentine belt, you loosen no pulley. You simply remove tension from the belt. The tension is applied by the Idler Pulley. Pry the idler back and remove the belt.


How do you replace the idler pulley on a 1997 dodge caravan?

Remove the belt, then remove the bolt holding in the idler pulley.


Can't loosen idler tension pulley on air conditioner idler pulley?

Replace the tensioner assembly as one piece.


How do you replace the idler pulley on 1992 350 engine?

Remove the old, damaged idler pulley and replace it with a new one.


What are idler pulleys?

== == it is a free pulley that works as a tensioner on any belt bolted to hold or spring loaded An idler pulley usually tensions a belt.. eg supercharger belt is kept taut by its respective idler pulley


Where is the idler pulley does it make a noise?

Is it serious if my car idler is making a noise?


Where is the idler pulley located on a car?

Most idler pulley's are near the top and usually quite easy to get to. Press on the belt somewhere, enough to deflect it a couple inches and watch to see which pully is mounted on a tension spring. That is the idler pulley.