Is the tensioner pulley supposed to spin?
Matthew Underwood
Score: 5/5 (41 votes)
Should the idler pulley spin freely?
It definitely will not spin freely. The new idler pulley doesn't seem defective, it spins freely in my hand but once i bolt it to the engine it doesn't spin free. Do new idler pulleys need to be "broken in"? Did you over torque the bolt that holds it down?
Should all pulleys spin freely?
The only pulleys you should be able to turn by hand when the serpentine belt is not in place are: the water pump, alternator, and power steering pump pulleys. ... That you cannot rotate either cam or crankshaft pulleys by hand is completely normal. If you were able to rotate them bare handed, THEN you would have a problem.
Does a pulley need to spin?
Because drive pulleys are directly connected to motors, they turn at whatever RPM (revolutions per minute) the motor turns. Idler pulleys instead are spun by the belt connected to the drive pulley. ... Conversely, if your idler pulley doesn't spin with minimal effort, you will probably need to order a replacement.
How does a pulley rotate?
As the rope is tugged, the pulley turns. The force on the rope travels around the pulley to the other end of the rope, so the pulley changes the direction of the force.
How to Diagnose a Loose or Stuck Belt Tensioner on Your Car or Truck
Why is my crankshaft pulley wobbling?
If the fan-belt pulleys that bolt to the harmonic balancer are dismounted, bent, or distorted, it may cause the crankshaft pulley to wobble. ... Sometimes, some dirt may get trapped under the pulley. Furthermore, the crankshaft pulley tends to wobble if it isn't appropriately torqued.
What causes a crankshaft not to turn?
If the timing belt or chain has broke then you may have bent the valves and the chain or belt will jam up the crankshaft from turning. The pistons will contact the calves and engine will not turn. ... This is if the pistons did not get damaged. You may need to replace entire motor due to internal damage.
Does the crankshaft pulley move freely?
Started rotating pulleys by hand with belt still on, and all pulleys move freely, including crank pulley. Pulleys did move when running and giving it fuel.
Should a belt tensioner pulley spin freely?
Checking the Tensioner
Spin the pulley to see if it spins freely. If you hear grinding or the pulley doesn't spin freely, replace the tensioner. When you replace the belt, it should take a lot of muscle power to move the tensioner. If you can move it easily, the spring tension is most likely not tight enough.
What is a tensioner pulley?
A drive belt tensioner is a pulley mounted on a spring mechanism or adjustable pivot point that is used to keep tension on the engine belts. ... When the tensioner has an issue, it can affect the how the belts drive the pulleys which can affect the performance and functionality of the vehicle.
Is belt tensioner supposed to move?
The tensioner arm should move smoothly and freely. Solution: If you notice a binding, sticking or grinding tensioner arm, the tensioner should be replaced.
Can you tighten a tensioner pulley?
The accessory belt needs to be loosened before the adjustment bolt can be turned on the side, top or bottom of the pulley. Turn the adjustment bolt clockwise to tighten the pulley.
What sound does a bad tensioner pulley make?
When the tensioner or tensioner pulley fails, the loss of tension can cause the belt and pulleys to make high-pitched rattling or chirping noises. If the pulley bearing completely fails, it can also cause a squealing or even a grinding noise.
How do you spin a crankshaft?
The most precise way to rotate the engine over by hand is to place a large socket on the front crankshaft bolt, attach a long ratchet wrench, and rotate the crank. The longer the wrench handle the more precise the movement.
Why is my car turning over but wont start?
When your engine cranks but won't start or run, it could mean your engine is having trouble producing a spark, getting fuel, or creating compression. The most common causes are problems in the ignition (for example, a bad ignition coil) or fuel system (for example, a clogged fuel filter).
Why is my engine turning over but not starting?
If the car cranks when you turn the key, but the engine won't start, it could be because fuel isn't getting to the engine. One potential reason for this could be dirty fuel injectors. Over time, the fuel injector nozzles can become clogged with rust, corrosion or debris.
Should a crank pulley wobble?
The crank pulley is pretty vital and affects the smoothness of the engine. If its wobbling then its bad. You may get away for years running it this way, or it may damage the main bearings.
Why is my harmonic balancer wobbling?
Failure to do may cause misalignment and galling. Excessive belt tension. An over-tightened belt may cause crankshaft snout runout and harmonic balancer wobble.
How do you know if you have a bad harmonic balancer?
If the harmonic balancer gets too old or fails and can no longer properly absorb the harmonic vibrations, the engine will shake excessively. The shaking will become even more pronounced, and therefore dangerous to the engine at high speeds.
How do you tighten a loose pulley?
Turn the adjustment bolt on the side, top or bottom of the pulley counterclockwise with the ratchet and socket until the accessory belt is loose enough to remove. Tighten the tensioner pulley by turning the adjustment bolt clockwise with the ratchet and socket until the belt is tight.
Does pulley have normal force?
The following example problem is a pulley system with frictional forces acting on the system. ... Force of friction will pull to the left of object one opposing motion. The force of gravity will pull directly down, and the normal force will pull in the opposite direction of the force of gravity equal in magnitude.
