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Breaking a timing belt

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Old Sep 17, 2009 | 05:12 PM
  #11  
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Default Re: Breaking a timing belt

Mental Note: Never drive/Buy a Kia.. even though they have decent warranties
Old Sep 17, 2009 | 05:14 PM
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Default Re: Breaking a timing belt

I don't think this has anything to do with being a Kia. That engine was abused so badly that the timing belt was the least of its worries, and the same thing would have probably happened to any brand of engine given the same abuse.
Old Sep 17, 2009 | 05:16 PM
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Default Re: Breaking a timing belt

Originally Posted by Fabrik8
I don't think this has anything to do with being a Kia. That engine was abused so badly that the timing belt was the least of its worries, and the same thing would have probably happened to any brand of engine given the same abuse.
this seems to be a usual occurrence in Kia's... Edit (timing belt failure)
Old Sep 17, 2009 | 05:21 PM
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Default Re: Breaking a timing belt

i'd be in agreement that this engine saw a lot more punishment than just a broken timing belt. just did a head job on an 01 audi tt, belt broke at about 65mph and it only bent the middle intake valve on each cylinder, and all the exhaust valves. it had some superficial damage to the top of the pisons, just some stamping from where the piston hit. replaced the bent valves, did a full valve job, decked the head, reassembled. we finished it about a week ago, and haven't heard back from the customer yet, so we've assumed its good to go.
Old Sep 17, 2009 | 05:37 PM
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Default Re: Breaking a timing belt

Originally Posted by Fabrik8
I call BS on just a timing belt breaking. Those pistons and chambers look like they've been melted, like there was a horrible lean condition for a while under high load. Valves don't break holes in all four pistons when the belt snaps, the valvetrain stops rotating long before that kind of carnage happens. Plus, the piston holes wouldn't have melted edges on them, they'd just be a clean fracture and nothing else (the valvetrain wouldn't have any more energy left after a few good piston hits and it isn't getting driven with a broken belt).
That's a LOT more damage than the engine shutting off at 40MPH because of a broken belt. I see the bent/broken valves, but that belt must have jumped a few teeth a long time before it actually broke in order to blow holes in the piston tops..

Where did that picture come from? What's the real story behind it?
Disagree, if you were running that lean (and it would take a power adder like nitrous for an extended period of time) you'd still see some marks on the cylinder wall. The valves had to have been popped off, lean conditions (had to be stupid lean for that to happen) will generally cause you to eat ring lands. *Note* Look at the exhaust ports, certainly not running lean. If you honestly think about it, theres lots of kinetic energy in a kia moving 40mph. Once that valve fragments and gets into those cylinders it takes a while of popping around, with no compression, a good guess on 'coasting is what, 20 seconds?" In a gear pushing 4000rpm, that a lot of 'lets destroy the pistons' cycles. + the pistons are probably some weak cast Al where as the valves are some sort of steel.
Old Sep 17, 2009 | 06:32 PM
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Default Re: Breaking a timing belt

At 132k miles I broke the original belt on my 95 Ls integra. I was like 17. The shop said there may not have been enough clearance when the pistons came back up with the belt broken and cams not moving. They were saying the valves could have been bent. And the money to pull the head and replace the valves would cost the same as a new/used motor swap.

Ending result 2800 bucks later. New LS motor.
Old Sep 17, 2009 | 06:40 PM
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Default Re: Breaking a timing belt

is it a 5speed??

i hope so cause if its an automatic the motor will quit spinning in a matter of seconds once the belt breakes

not 20 seconds later and all the while beating up the head and valves...

i call bullshit on this also...just too much damage for a timing belt breaking...
Old Sep 17, 2009 | 06:43 PM
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Default Re: Breaking a timing belt

^ if you asking me the 5 speed ? then yes, my car was a manual..

as for the OP idk.
Old Sep 17, 2009 | 06:44 PM
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Default Re: Breaking a timing belt

no the op...he states it coasted for 20 seconds with the engine spinning...what engine do you know spins for 20 seconds once the belt breaks???none...so unless its a 5 speed and the driver never engaged the clutch then its bullshit...
Old Sep 17, 2009 | 08:42 PM
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Default Re: Breaking a timing belt

Originally Posted by nftuatn
no the op...he states it coasted for 20 seconds with the engine spinning...what engine do you know spins for 20 seconds once the belt breaks???none...so unless its a 5 speed and the driver never engaged the clutch then its bullshit...
I'm just assuming. I'm sure you know the stupid things drivers can do.

And my GSX. Popped the belt at 60 - coasted for a very long time. I bent almost all my valves in the 3 seconds it took me to lose power to push in the clutch. I could imagine for someone else it[engaging the clutch] not to happen.



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