Timing belt broke, took out valves. - NOT - Kia Forum
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#1 (permalink) Old 07-27-2011, 03:06 PM
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Default Timing belt broke, took out valves. - NOT

For three years I have believed that our Kia Sportages were non interference engines. I changed the timing belt at 90K confident that if it broke, no huge problem. Well, just 25K miles later, it broke and my mechanic tells me he can only turn the engine half way each way before it locks up, presumably from hitting the valves. (After he put the new belt on.) The cost is quickly ramping well past $1000.00. The spring for an idler was stretched, the belt is broken clean.

Does this match anyone's experience? Do you think something else let go and that I am getting a false explaination? The engine did turn easily with the starter, so the lock up does seem connected to the fact that the valves are moving now.

Thanks, Paul
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#2 (permalink) Old 07-27-2011, 03:23 PM
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It sounds like one or more valves are bent, which could prevent them from closing. (A compression test would prove if this is the case). In an open position, the piston will strike the valves, producing the 'locked' sensation you're getting. The same thing happened to several of my friends' Hondas years ago. I wish car companies would stop making interference engines with timing belts.
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#3 (permalink) Old 07-27-2011, 06:46 PM
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Default The rest of the story, or the jury is still out on interference

I wrote the below story of woe before I went to see the mechanic for the second time this evening. I wanted to check that the individual cams could turn. I assumed that what ever broke the belt might have been a stuck cam shaft. Once we took the belt off, they turned freely and had resistance, like they were pushing valves. Then the mechanic put the big wrench on the crankshaft and it was frozen. I said, I think the car is in gear. It was, in fourth, the car was on jack stands in front and once it was in neutral, the crank spins normaly. Now it should be just a process of reassembly.

However, does anyone have a good idea of why a belt should break so prematuraly? Any hints on how tight to make the idlers, what to do with the spring on one of them? Thanks, Paul

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Originally Posted by michigandiesel View Post
For three years I have believed that our Kia Sportages were non interference engines. I changed the timing belt at 90K confident that if it broke, no huge problem. Well, just 25K miles later, it broke and my mechanic tells me he can only turn the engine half way each way before it locks up, presumably from hitting the valves. (After he put the new belt on.) The cost is quickly ramping well past $2000.00. The spring for an idler was stretched, the belt is broken clean.

Does this match anyone's experience? Do you think something else let go and that I am getting a false explaination? The engine did turn easily with the starter, so the lock up does seem connected to the fact that the valves are moving now.

Thanks, Paul
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#4 (permalink) Old 07-27-2011, 09:16 PM
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Originally Posted by michigandiesel View Post
...
However, does anyone have a good idea of why a belt should break so prematuraly? Any hints on how tight to make the idlers, what to do with the spring on one of them? Thanks, Paul
Improper belt tension due to failed component, or defective belt would be my guess.

A properly working idler pulley with the spring in good condition does not require any additional "tightening" to properly tension the timing belt, aside from removing any slack present between the Intake & Exhaust cams during installation.

Did the mechanic or installer of the previous belt do so with the idler pulley not working properly?

I'd recommend signing up at the kiatechinfo website and review the timing belt installation procedures for your model year Sportage there.

Please update your user profile w/ the particulars of your Sportage, so others on the forum can help you better..

Kia Tech Info site: http://www.kiatechinfo.com
Laptop/USB OBD-II Scanner at Amazon: http://tinyurl.com/3jjf7xz
OBD-II Codes: http://www.obd-codes.com/trouble_codes/
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#5 (permalink) Old 08-23-2011, 02:20 PM
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The first timing belt was put in at a community college for free, I provided the parts. That opens up many possible failure modes. The car is a 2002 Kia Sportage, with 116,000 miles on it. Thanks for all your help.
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#6 (permalink) Old 08-23-2011, 03:24 PM
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Me and a mechanic friend of mine installed a new timing belt on my '94 Eclipse. About 40,000 miles later, it broke. We had no other assumptions to make other than one of us crimped the belt during installation, which can cause a weak spot in the belt. One of the guys at the community garage may have gotten impatient and crammed it into a tight spot, not realizing that he was cutting the belt's life in half.

Thankfully, it's getting harder and harder to find new cars equipped with a timing belt. What a horrible idea. Sorry for your troubles.
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#7 (permalink) Old 08-23-2011, 03:45 PM
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The KIA engine is indeed a roll through design (non interference).

I recommend using Gates timing belts, stay away from no name/re-branded.. any twisting or rolling of the belt will shorten its life, as will incorrect tensioning.

Lots of mechanics like to add a finger to the idler during installation (wrong), loosen idler, install belt, roll engine over twice by hand and the idler spring will remove the correct amount of slack, tighten idler retaining bolt.. check alignment, if OK, button her up..... Philip
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#8 (permalink) Old 08-23-2011, 08:06 PM
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bit of oil can reduce life.
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#9 (permalink) Old 08-23-2011, 09:28 PM
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Law of Averages. You hear about some timing belts lasting 30, 40, 50K or more beyond the intended service life. Somebody is bound to end up on the short end of the stick.
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#10 (permalink) Old 08-23-2011, 10:08 PM
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Even still, a non interference engine in 9 out of 10 situations, will not damage the valves. Just saying...

I must be lucky, I got 180,000 miles on the original belt, it broke when I was on the freeway going 60 and it was fine 3 hours later...

"Does this part need to be in there?"
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