Hello, i recently ran into an issue with my 92 4.0 l6 motor, at first thought it was a piston or something but then i pulled the oil pan and saw metal in the pan i recognized the metal as timing chain so then i pulled the head to check all of that jazz it all seemed good, im now confident that it was the timing chain, although my question is what would cause the chain to snap? Also the bottom timing gear teeth are all ripped of from the timing chain snapping, can someone help, wanna know what could have caused it before i put motor back together, thanks

 

Old age can cause it t fail. After all it is a moving part and moving parts tend to fail. The chain could also have been stretched and running it like that could also can cause it to chew up the gears.

 

Sorry i forgot to add this really important part, the chain was pretty much brand new it had been ran for about 500 miles before it snapped

 

Yea,that parts important all right.

Crank or cam aren't locked up?

 

Crank isnt for sure cause it was turning over, although i havent pulled the timing cover off so i haven't been able to try to turn the cam, thinking maybe a cam bearing busted?

 

That makes a big difference. How was it running before it snapped? Was it making any kind of rattle or strange noise from the front of the engine? The only reason I have seen one that new snap, was the gear wasn't pressed all the way in to place. It cause the chain to bind and it snapped. It was on one of my brothers cars that he put a new chain on and didn't seat the gear all the way into place. The only other thing I could think is the chain was defective.

 

It was running great better than it ever had really, i was thinking possibly a cam bearing busted and gave slack in the cam to push forward? Its far fetched but i kinda have to think of the worst before i put it back together

 

Won't know what happened til you look. Time to dig in and get dirty. Let us know what you find.

 

Will do im just trying to get a puller, after i have it off ill update yall! Thanks for the feedback!

 

Good enough.

 

You now have little metal parts running around in your engine. Yay!

You also don't know if you screwed up the valves or bend the camshaft because you can't see that just by looking at it.

Time for a full rebuild.

 

Depends where the metal ended up. If it simply fell into the pan then no real issue.

Possibility of defective chain. Or like the others said, cam or gear problem.

 

Probably a POS chinese timing chain and gears.

Has WunHungLo struck again?

 

First they poison our dogs. Now this?

 

The ChiComs eat dogs.