Hi I have a 2000 isuzu kb 2.8 td. The pulley on my crank seems to be in 3 parts and sometimes when i turn sharp or when the engine is cold it will make a screeching noise. I made marks on all three and i notice the pulleys "rings" move when this noise accurs, should they be moving? Refer to photo 
I would advise replacing the harmonic balancer asap. If the marks are moving then the bonded rubber which is the movement for the harmonics is coming apart and if not replaced will fail with possible radiator. timing cover and other related damage. I have seen one come apart on a Chrysler valiant and it hit the ground and went through a windscreen. The screech is the outer pulley slipping on the crank hub.
SOURCE: Crankshaft pulley (vibration damper) moved forward.
the pulley is also a dampener often times they seperate from each other. replace pulley/dampener.
SOURCE: crank shaft inner pulley lose on 2003 Exterra 3.3
I don't have one. I have the same problem can someone help?
SOURCE: Whining from engine when in gear
Just a thought- remove the oil filler cap when the whine is present - (this checks if PCV valve is faulty, causing high crankcase vacuum, which in turn causes a whistling/whine noise as air leaks past engine oil seals). Worth a check.
Try listening with a short piece of hose pipe to locate immediate area/source of noise.
SOURCE: I have a 2000 Lincoln Continental 4.6L V8 with
It may be a idler pulley bearing starting to freeze up remove the belt and turn all pulleys,power steering pump, alternator, idler pulley , etc. to find out if there is excessive resistance offered if so this is the culprit, on the idler pulley check the raidial play in the bearing by trying to move it by holding it with your hand and try to wiggle it gently back and forth same with the other (pulleys) check for loosness or play in pulleys bearings if everything checks out ok the battery may be running low and upon startup the alternator is under alot of strain to compensate for the recent drain on the battery while it is stressed to turn the starter to start car, your car may be drawing power from the battery as the car sits causing this condition disconect the pos. terminal of the battery and run a positive voltmeter wire to battery terminal then run negative volt meter wire to the now removed positive battery terminal cable set the voltmeter to dc there should not be 12 volts present if so there is and open circuit present drawing down the battery as the car sits while off.
Good luck
SOURCE: wobble on crank pulley. makes
Do not overtighten drive belt as this will pull on crankshaft pulley and cause a catastrofic imbalence and destroy crankshaft oil seal.I have learnt this at my cost.Do not continue driveing get it sorted as soon as possible.
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