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I drive a 2011 F-150 with the 5.0 motor in it and after cranking it up this morning it's driving fine but the circled pulley at the front of the block (with arrow pointing towards the front of the truck) is wobbling rather aggressively and making a rough rattling sound. I've had the belt squeaking for a few days but assumed that was just grease or something on the belt.

It drives smoothly, but the noise and play in that wheel are very concerning, considering it's very cold (for Texas) and that I have to drive an 80 mile round trip first thing in the morning.

My question is as follows: what is the name of this component, what might cause above symptoms and what are the odds that driving on it tomorrow morning will hurt it or leave me stranded?

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    That's a pulley, not the flywheel. The flywheel is at the other end of the engine between the engine and the transmission. I edited the question to correct it, but thought I should explain why. – dlu Jan 8 '17 at 22:31
  • I appreciate that @dlu Wasn't sure quite what it was so thanks for the correction. – Golightly Jan 8 '17 at 22:39
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I'm not familiar enough with that engine to say for sure, but the circled pulley might be the water pump. The wobbling is not a good sign, it indicates that a bearing is failing.

There are four accessories that are likely to be driven by a belt or belts at the front of the engine:

  • The water pump (it will probably have a largish hose or hoses with hose clamps on them connected to it – or there may be nothing connected to it at all, some pumps work entirely within the block),
  • The alternator (it will be the only one with big wires connected to it, it will also usually have an open frame and you'll be able to see more wires wound inside of it),
  • The power steering pump (it will be near the top with a cap for checking and adding fluid either on the pump or close by, there will be two relatively small hoses and they will head towards the firewall of the engine), and
  • The air conditioning compressor (it will have a couple of relatively small (compared to the alternator) wires connected to it as well as two hoses, the hoses will be small, similar to the power steering pump, and will not have hose clamps).

The final possibility is that that is either the tensioner or an idler on the serpentine belt. If either of those fail, you're likely to loose all of the accessories driven by the belt. The tensioner will be on an arm that allows it to move and keep the belt tight. Idlers will just be there to change the direction of the belt.

Most likely the problem is with the water pump. It would be risky to drive with it in the condition you describe, but you might make it. If the pump fails you may loose coolant or coolant circulation (or both). You'll probably first notice the loss of circulation as a loss of heat. If it starts leaking you may smell as sweet smell and notice the temperature going up. Carry extra coolant with you if the problem is with the water pump.

Another thing to be concerned about is the other accessories driven by the same belt. If the wobbling pulley fails you may loose the others as well.

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    Agreed. That really looks like the water pump, based on what I saw in the below linked page. If that's the case, don't delay in getting this addressed. No coolant flow quickly means overheating, which quickly means new engine. ford-trucks.com/how-tos/a/… – atraudes Jan 10 '17 at 18:30
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    Thank yall very much, it was a blown water pump. Got it sorted ASAP and he's back to running perfectly. I appreciate yalls input! – Golightly Jan 11 '17 at 0:12

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