Crankshaft Pulley Bolt May Come Loose on Toyota Tacoma

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.

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Average mileage: 139,857 (70,000–205,000)
Engines affected: 2.4L 4 Cylinder, 2.7L 4 Cylinder, 3.4L V6
4 model years affected: 1995, 1996, 1997, 2001
10 people reported this problem
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problem details
1995 Toyota Tacoma - 2.4L 4 Cylinder 187,000 mi,
Bottom pulley fell off, very cold, approx 5 degrees F., about a mile after leaving home with it.
1996 Toyota Tacoma - 3.4L V6 83,000 mi,
Pulley fell off completely, bolt and washer are gone. It looks like the pin broke.We haven't fixed it yet.
2001 Toyota Tacoma - 3.4L V6 117,000 mi,
engine making thumping noises then finally a hose fell off
1997 Toyota Tacoma - 2.4L 4 Cylinder 70,000 mi,
Loss of charging and oil pressure, Both lights came on.