Because the "Harmonic Balancer", aka, "Cranshaft Pulley" is actually a 2 piece, part. The hard rubber center hub sometimes loses its way, and once it starts 'wobbling', it eventually fails. Symptoms include belts coming off the pulleys, and also them breaking, both in half, and by splitting sideways (making the belt thinner, to accomodate for the new alignment).
Part can be found at most auto parts houses, for about $50.
Needs to be put on with an impact wrench!
It should, it is the same generation of Venture van.
Looking at the bottom side of the front of the engine at the crankshaft pulley, the CKP is at the 10 O'Clock position of the crankshaft pulley
That would be the crankshaft pulley.
Crankshaft pulley turns with the crank, if it won't turn at all, something internally is broken.
If the cranks shaft pulley is seized, the whole engine is seized.
No, but it can be replaced. I would recommend taking to a professional.
It's behind one of the camshaft pulleys. Why would a CRANKSHAFT position sensor be behind a CAMSHAFT pulley ??
The most logical reason for the key or tip as you call it breaking off is probably a result of improper torque on the crankshaft pulley or the crankshaft pulley is out of balance.To prevent this I would highly suggest buying a new crankshaft pulley that will be balanced.To explain what happens over time the strain of adjusting the belts from the alternator and power steering and air condition pull the crankshaft pulley with varied tension and can cause the crank pulley to warp to a degree causing it to be unbalanced.While this may seem a bit strange the metal will be affected by this due to age,temperature,torque from the belts tensions pulley left and right.Best bet buy a new crankshaft pulley (note just look at the pulley while idling and see if is wobbling) this will tell you the pulley is warped or out of balance.Plain and simple!
does a 2003 chevrolet venture have a timing belt and if so how oftent does it need to be changed and what would be the approximate cost?
if your fuel pressure is still good i would replace the crankshaft position sensor , it is located behind the crankshaft pulley, you will have to pull it with a puller.
It's hard to prove fault in these cases but the timing belt change requires removing the crankshaft pulley. So the mechanic would have had to have at least seen its condition. More likely, he damaged the pulley in the process of replacing the timing belt. Maybe he used an impact wrench when he reinstalled it and the key wasn't aligned correctly?
A good place to find replacement mirrors for a Chevrolet Venture would be your local Chevrolet car dealership who should carry a good range of spare parts. In addition they may also be advertised on eBay or Amazon where the cost may be a little less. Another source would be a auto salvage yard where you may even find the right color.