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Chances are it's the tires rather than the engine. Does the hum diminish if you back off the accelerator? If yes, then look at rear axle pinion bearing. If no, then feel across the tires. They should be smooth across. If they're rough, they will make a loud howling noise.
what kind of noise? if rattling noise and noiser when you accelerate, either in idle position or while moving, then you need to overhaul. if high pitch sound and noiser when you accelerate, then check you bearing in timing belt mechanism