What makes a timing chain gear on a 1995 Olds 3800 engine with 60000 miles breakdown?
The timing chain can fail because of poor maintenance , insufficient oil changes. Lots of long periods sitting with dry starts. Dry starts are murder on engine internals.
Take a picture of it and post it. Never have seen one unless it was a defective part. Most likely you got shafted by you mechanic. My 3800 has 294000.00 miles on it.
The starter turns the flywheel at the back of the engine. When the flywheel turns the whole engine turns. The timing chain is on the other end at the front of the engine. It is connected to the crankshaft and camshaft (s). So indirectly yes it does. If the whole engine is turned but the timing chain doesn't, there is a problem. Probably a broken timing chain.
Yes. A fault in the timing chain usually leads to a total loss of the engine as the timing chain synchronises the mechanical operation of the engine. If this goes wrong bits of the inside of the engine will be physically destroyed (the engine will have to be rebuilt). It is MOST IMPORTANT to replace the timing chain on an engine WHEN the manufacturer says it need to be done.