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495 Posts
Is it raining by any chance when this happens?
I'd check all parts driven by the belt for loose bolts and/or damaged pulleys: AC compressor and bracket, alternator, water pump, and power steering pump. Something's out of alignment causing the belt to slip off. Could be the new tensioner is no good.
If nothing else, Dorman makes a shield that goes on the tensioner and idler pulleys (part #82570) that a lot of people use on these engines when they toss the belt in wet weather. My own Imperial got one after it threw the belt in the middle of a snowstorm driving through a snowbank, causing me to get severe frostbite. My crank pulley wobbles a bit too, but it doesn't seem bad enough to be a major problem. The belt's only come off twice in four years, both times driving in deep snow. Shouldn't be a problem for me any more.
I'd check all parts driven by the belt for loose bolts and/or damaged pulleys: AC compressor and bracket, alternator, water pump, and power steering pump. Something's out of alignment causing the belt to slip off. Could be the new tensioner is no good.
If nothing else, Dorman makes a shield that goes on the tensioner and idler pulleys (part #82570) that a lot of people use on these engines when they toss the belt in wet weather. My own Imperial got one after it threw the belt in the middle of a snowstorm driving through a snowbank, causing me to get severe frostbite. My crank pulley wobbles a bit too, but it doesn't seem bad enough to be a major problem. The belt's only come off twice in four years, both times driving in deep snow. Shouldn't be a problem for me any more.