Crankshaft Pulley Bolt May Come Loose on Toyota Tacoma

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.

Problem Data
RepairPal Verified
Average mileage: 137,888 (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
13 people reported this problem
Viewing 1 - 6 of 6 comments
Bottom pulley fell off, very cold, approx 5 degrees F., about a mile after leaving home with it.
Pulley fell off completely, bolt and washer are gone. It looks like the pin broke.We haven't fixed it yet.
Havent repaired yet waiting on price to see if worth fixing
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.
engine making thumping noises then finally a hose fell off
Loss of charging and oil pressure, Both lights came on.