Timing belt went at about 25 mph

[circlecreeper]

Hello, first post here. I was wondering, since this is an interference engine do you think the pistons hit the valves at this speed. I can see where the teeth came off, right after the intermediate. If these did hit what would you think the cost would be on parts and what parts need to be replaced?

Thanks

[pocket-rocket]

These engines are not interference at low rpm, so road speed has nothing to do with the possibility of the valves being bent. They do become interference at high rpm (probably due to valve float), so if say you were on it hard when the belt went, yeah you could have bent valves and the only way to tell how many you need (to find the price out) is take it apart to find out how many valves you trashed if your only replacing the bad ones. If the belt went at low rpms, grab a new belt, slap it on and go because it will be fine.

[IsaacHayes]

How can it become interference at high rpm? It either is or isn't.

[SappySE107]

It is non interference because you can time the motor with a piston at TDC. Its interference because rod stretch and/or valve float will cause the valves to make contact if the belt breaks. If it didn't break at WOT, then its most likely fine.

It is AND it isn't.

[IsaacHayes]

Well valve float isn't going to matter if the cam is holding open a valve because it's not turning. Rod stretch however will matter.

[pocket-rocket]

Well valve float isn't going to matter if the cam is holding open a valve because it's not turning. Rod stretch however will matter.

Well the float could happen at the exact moment the belt lets go and the piston is coming up, making it interference at that point in time. But at any rate, the belt that shredded (literally) on the 91 when Ben was driving it went at about 30-40 mph if my memory serves me.

[circlecreeper]

sorry it took me a while to get back on here. Well, I have everything off down to the valve covers and got the old belt off, OMG it was shredded and looked like it was dryrotted. I got all the stuff I need, I had a guy to help me with the timing but it looks like im gonna try myself. Im having a problem finding the timing marks but I guess ill do some more research this is my first timing so. I really am caught between, I mean i could go ahead and take the heads off to see if theres damage but if there isnt theres 300$ on gaskets if there is Id save myself another headache later.

wish me luck

[circlecreeper]

Well ended up buying a cam sprocket tool and got everything done. Only problem I had to rig up my tensioner with a washer behind, I snapped off the corner of the bracket could not remove the torx bolts that hold it in place. Ill have to take it to a dealer or something, but i did get the timing done and everything put back together

[94GPGTP]

how is the washer being used in this situation?

[circlecreeper]

It made up the slack between the broken part and the front cover of the engine. The tensioner is still seated in both parts. I snugged the tension plate into the whole thing, though id like to get it replaced eventually.