I have a show in 9 days and go figure the truck starts making a god awful noise. Had the mechanic out to look at it and he said the crank shaft sheered off toward the back.
Now I know very little about engines, but it doesnt seem like it would still be running if that happened...??
Anyone have any input on this? Maybe he's wrong?
If the crankshaft has sheared, it would not be making any noise at all. It's the most important part inside a motor, and one of more than a few that kills an engine if it's damaged. In short NWIH would it still be capable of still running.
It's possible that the crank shaft pulley bolt is sheared off...
You said you started it up and it makes an awful noise, does it drive? Does the noise only happen at idle, but decrease when the RPMs increase? Does the truck have less than average power? Need a few more details, because it sounds like it's not the crank shaft itself, but one of it's lovely extra parts...
It still drives fine and when you rev it higher, around 1500 rpm, it quiets down significantly. The motor that's in it is a 1993 7.3 international with a banks turbo. Hubby said turbo is working great, he checked the exhaust, no leaks there.
Some guy at another shop we stopped at said he thought it was the fly wheel that broke. And the cranks breaking is very rare.