Problem Description and Possible Solution
Some engines have had the problem of the crankshaft pulley bolt coming loose. This will make a rattling noise as the engine idles. Our technicians tell us that the pulley bolt should have a thread locker applied and then retorqued.
Average mileage: 137,888 (70,000–205,000)
Engines affected: 2.4L 4 Cylinder, 2.7L 4 Cylinder, 3.4L V6
13 people reported this problem
Bottom pulley fell off, very cold, approx 5 degrees F., about a mile after leaving home with it.
Took 1997 Tacoma to AAA Service center to get cooling system replaced, radiator, hoses, flush, thermostat, belts. Learned I had a front crankcase seal leak. Had that replaced too. Next day all pulleys started to stop rotating. No power steering, brakes, fan. Took it back and they said nothing but a loose crankshaft pulley. Not to worry. The truck started to run badly and stall at stop lights.
I think there may be damage to some internal part of the engine.