Sudden loud noise
Not a vacuum hose. If it is coming from the top of the motor, I would first check the oil. If there is a hole punched into the oil pan , you may be very low on oil. If oil's fine, I would suggest looking at the transmission housing. If the manhole came up and hit the housing, it may have cracked that, or cracked the fly wheel. One more thing I'm thinking is that if the manhole hit your starter, and pushed it up, It may have cracked the fly wheel. This can make it sound like it's at the top of the motor. Very loud tap tap tap tap. If you excellerate, the noise will go faster too. I just can't see a manhole doing any damage to anything in the top of motor. Make sure you check the oil ASAP. Hard to tell without hearing it. A video would even help. Let me know what you come up with. Good luck
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