Timing Belt Snapped :(

[TSiAWDchick]

Need some advice.. here's the story...

My T25 blew.. so i ended up replacing it with the Evo3 16g from slowboy racing. Did all the work.. front mount, fuel pump.. etc.

Was on the highway tuning my car, with DSM link, doing a 3rd gear pull.. my car shuts off and won't start.. thinking it was the clutch, had it towed to a shop to figure out my timing belt had snapped..

Problem is I replaced the timingbelt along with the balance shaft belt.. tensioner, and all new pulleys like 5k miles ago..

Because i modded my car.. is that why my belt snapped or was it done wrong?

 

[SBstar]

The belt didn't snap because you modded your car. Did you use a factory mitsubishi timing belt? It is recommended to use the factory belt instead of an aftermarket one. It was either done wrong during installation, or you got a crappy belt. Make sure you check your head and see if you bent any valves. There's a good chance you'll have to replace your head, or at least have it rebuilt. An expensive lesson learned. (trust me I know, I've been there)

 

[illinest]

same thing happened to me.
Is it common for any car to bend valves when the timing belt breaks? I thought it was possible to break a timing belt without breaking the rest of your car.

 

[reveal1123]

Our cars are not "interference free" engines. When our timing belt breaks, the valves get bent. MR2's have interference free engines where their pistons do not come up far enough (or valves do not open enough) to cause damage, so if their timing belt breakes, the only thing they have to replace is the belt, where as we could need a complete rebuild if its bad enough.

 

[SBstar]

^^^Thats what happened to me, complete engine rebuild, ended up selling the car^^^

 

[TSiAWDchick]

No i used all factory mitsu parts.. i work for a car shop so i get a discount.. no problem there.. but the mechanic says it looks like the belt jumped.. because the inside of the belt is totally shreaded. He still has to pull the lower cover to see what more happend but everything was replace correctly because i had been driving the car for like 8months before this happend. but everything was taken when the belt snapped.. he said there was shit lying at the bottom of the head

how much would someone give for a car in this condition? i mean everything else is built.. it has an awesome stereo.. i was thinking of parting it out.. but this thing was my babby

 

[theSicKness]

its a timing belt.....fix it....if needed replace valves......
i wouldnt dream of selling my car after all work ive done but thas just me

 

[steve]

If the inside edge of the belt is shreaded a couple of things could be going on.

The backing plate on the crank pulley could be flipped.
The oil pan bolts could be in the wrong position. There are longer and shorter bolts and position is important when replacing the oil pan.
The tensioner arm pivot could be worn causing uneven tension on the belt and forcing it to walk into the block. You have to replace the drivers side engine mount to fix this.

Steve

 

[RiceKiller_TSi]

Now is the time to<a href="http://www.dsmtuners.com/forums/showthread.php?t=186331" target="new"> rebuild </a>it better than ever.

 

[TSiAWDchick]

its a timing belt.....fix it....if needed replace valves......
i wouldnt dream of selling my car after all work ive done but thas just me

... no its not just a timing belt.. it took the whole motor with it... its not like I WANT to get rid of my car but its what I can afford. I mean i replaced the timing belt and everything in the first place to prevent this from happening..

 

[RiceKiller_TSi]

It is a non-interference motor,

You do mean its an "interference" motor. Right?

 

[Doug99RS]

All of the DSM motors are interferance and are HIGHLY capable of doing damage to the valves, pistons, head and cylinder walls should the timing jump. Chances are that more than one valve is bent from hitting the pistons but frequently this is the most it will do. In severe cases the valve head can be snapped off and then will bounce around in the combustion chamber doing most of the damage.

You will need to remove the head and inspect it, the pistons and the cylinder walls for damage and evaluate your situation from there.

 

[boostedinaz]

It took the head, or just the valves. Not the whole motor. It is a non-interference motor,

So if it isn't an interfernace motor then why would the valves bend?

I think what you meant to say was that the pistons tend to be a bit more resilient than the valves when they come in contact.

 

[Game Over]

So if it isn't an interfernace motor then why would the valves bend?

I think what you meant to say was that the pistons tend to be a bit more resilient than the valves when they come in contact.

My fault dude, I do mean the bottom end should be fine, meaning the pistons, but yes, I agree the head is done.

 

[99gst_racer]

Jessica - When did your belt break? Within the past couple days? Has the head been pulled yet? Hopefully nothing in the black was damaged. As long as the pistons and cylinder walls are OK, all you have to do is buy new valves, guides, head gasket, and a t-belt. It shouldnt be too expensive. That definitely sucks ass that it happened (especially right before the shootout), but I wouldnt go selling my car if it were me. If you need help locating new valves, guides, or a HG, PM me.

 

[95 'clipse RS]

similar thing happened to me, cept mine had skipped a few teeth when it started, it backfired horribly out the intake, and the engine kicked backwards on the starter. come to find out that all the intake valves are bent when i pulled it off a couple days ago, they were about a 1/4 of an inch open. this isnt a hard job to do at all, in fact these cars are easy to work on, i mean the actual labor part, not diagnosing .

anyways it wont be that much money as your thinking. im jus now getting the head rebuilt after a a/t to m/t swap, and the head is only costing $250 even with a 3 angle valve job. ill be back on the road in a week, im just gonna triple check the timing this time .

peace

 

[TSiAWDchick]

the mechanic tells me what happend was the balance shaft belt snapped.. taking the timing belt with it. my whole head is ####ed.. valves bent everything.. we are taking the chance that my pistions are okay and we are going to put a brand new head on it.

what bothers me is the same thing happend to my friend like 2 weeks ago.. what is up wiht the balance shaft belts snapping?

 

[Defiant]

what bothers me is the same thing happend to my friend like 2 weeks ago.. what is up wiht the balance shaft belts snapping?

Lack of maintenance. Both the balance shaft belt and the cam belt have to be replaced at 60K. Or, ....

 

[99gst_racer]

what bothers me is the same thing happend to my friend like 2 weeks ago.. what is up wiht the balance shaft belts snapping?

The balance shaft belt spins at twice the RPM's of the crank, so at redline, your balance shaft are spinning at 14K rpm's. Thats why it's always best to eliminate the balance shafts. No shafts = no belt. I know Brandon was preparing to do his timing belt and b-shaft elimination in a few weeks, but then he lost his timing belt just like you did. Definitely make sure you eliminate the b-shafts this time around, so this won't happen again.

Lack of maintenance. Both the balance shaft belt and the cam belt have to be replaced at 60K. Or, ....

umm..... Definitely not lack of maintenance in this case. first post ---> "Problem is I replaced the timingbelt along with the balance shaft belt.. tensioner, and all new pulleys like 5k miles ago.."

 

[Defiant]

umm..... Definitely not lack of maintenance in this case. first post ---> "Problem is I replaced the timingbelt along with the balance shaft belt.. tensioner, and all new pulleys like 5k miles ago.."

Not correctly, apparently.

 

[DROOPY209]

Sorry to hear about your misfortune. if the pistons look okay, then maybe you just need new valves, guides, head gasket, and miscelaneous items to get it running again.


I hate that balance shaft belt.

None of my 3 dsm's have it. I recently cut the balance shaft belt off of my red awd a couple months ago...........

Sometimes i would get all paranoid knowing that the stupid balance shaft belt could rip at any time, taking the entire head with it.

Guys, if you still have the balance shaft belt, do yourself a favor and at least cut it off. When you do your timing belt, and have a lil more money, eliminate the balance shafts and sleep good at night.

 

[boostedinaz]

Sorry to hear about your misfortune. if the pistons look okay, then maybe you just need new valves, guides, head gasket, and miscelaneous items to get it running again.


I hate that balance shaft belt.

None of my 3 dsm's have it. I recently cut the balance shaft belt off of my red awd a couple months ago...........

Sometimes i would get all paranoid knowing that the stupid balance shaft belt could rip at any time, taking the entire head with it.

Guys, if you still have the balance shaft belt, do yourself a favor and at least cut it off. When you do your timing belt, and have a lil more money, eliminate the balance shafts and sleep good at night.

NO. Dont be lazy and just cut the belt becasue the second shaft will still be in there working and it may cause bad vibration. Do it right and just eliminate both at the same time.

 

[99gst_racer]

I recently cut the balance shaft belt off of my red awd a couple months ago...........
Guys, if you still have the balance shaft belt, do yourself a favor and at least cut it off. When you do your timing belt, and have a lil more money, eliminate the balance shafts and sleep good at night.

That is not very good advice.
To those who just CUT the Balence shaft Belt L@@k WHAT HAPPENDS
I would never recommend half-assing something like the b-shafts. Just do it right the first time and you'll sleep even better at night.

 

[TalonRcR]

the mechanic tells me what happend was the balance shaft belt snapped.. taking the timing belt with it. my whole head is ####ed.. valves bent everything.. we are taking the chance that my pistions are okay and we are going to put a brand new head on it.

what bothers me is the same thing happend to my friend like 2 weeks ago.. what is up wiht the balance shaft belts snapping?

While this happened and your spending the money to fix it just do the 6 bolt swap. Because if you do all this work and your car crankwalks your going to be in the same boat again.

Chris

 

[TSiAWDchick]

I'm keeping the 7bolt.. having it re built with wiesco pistons.. concidering they were beat to hell.. i had no crankwalk so i don't feel like going through the hassel of getting a 6 bolt right now.. but we are eliminating the balance shaft so hopefully all will bee better soon