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Broken Timing Belt.. chances of bent valves?

 
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Old 03-18-2011, 02:14 PM
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Icon5 Broken Timing Belt.. chances of bent valves?

To add to my prelude nightmare, I just snapped the timing belt. I could get it replaced for $300 but what are the chances that I did some extra damage?

Here is the scenario:

The other day i heard a faint sound (not quite but almost grinding noise). I could not locate it and the car ran fine. Figured i'd take it in this weekend.

While driving it, i suddenly noticed this sound got much louder and sounded basically like something being ripped to shreads.

I pull over, check everything and could not locate the problem. I was on my lunch break close to work and HAD to get back so unfortunetly I drove it about half a mile down the road. I parked it, engine running, opened the hood to try and locate the sound again... found out it was coming from where the timing belt is housed.... then it shut off and that was that.

So i'm sure its the timing belt but it held on, i guess, in pieces until I got it parked. The car was idle i guess when it snapped totally. What do you think the chances are i belt a valve?
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Old 03-18-2011, 02:18 PM
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Re: Broken Timing Belt.. chances of bent valves?

When my timing belt went, the car didn't start at all. Hell, the key didn't turn in the ignition. I also smelled a unique scent when it went, like butane and burning rubber.

I can almost gauruntee your valves are bent from trying to start the engine a few times after it snapped. That's what happened to me, runied the pistons as well.
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Old 03-18-2011, 02:32 PM
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Re: Broken Timing Belt.. chances of bent valves?

If you tried to start the car then you probably bent them. I'd say 1% chance once the belt breaks and you DONT start it, then you may not have bent valves.
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Old 03-18-2011, 02:37 PM
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Re: Broken Timing Belt.. chances of bent valves?

Well I'm an idiot and I tried to start it once.
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Old 03-18-2011, 02:54 PM
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Re: Broken Timing Belt.. chances of bent valves?

You could try to put a new belt on and see if she works...
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Old 03-18-2011, 03:14 PM
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Re: Broken Timing Belt.. chances of bent valves?

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Originally Posted by dr2day View Post
You could try to put a new belt on and see if she works...
The thing is I could just trade it back in and switch the car out rather than take that $300+ roll of the dice (which looks like I would most likely end up on the wrong side). I just had problems with the transmission of course, and the dealer fixed that issue out of their pockets.

Since I bought the car over a month ago, i've been able to drive it a record of about one week before something else major has happened to it.

It's an automatic and after reading everything with those issues (and finding out first hand), i think I might just have to hand in my prelude badge. I love the way the car handled, and how it looked, but this particular prelude is a nightmare and I don't have the opportunity to get another. Too bad, I really liked them.
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Old 03-18-2011, 03:15 PM
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Re: Broken Timing Belt.. chances of bent valves?

It is hit and miss on our cars on whether you will bend valves when you break your timing belt, but if you try to start it after... Never a good idea lol
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Old 03-18-2011, 06:19 PM
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Re: Broken Timing Belt.. chances of bent valves?

new belt+compression test

or pull the head
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Old 03-18-2011, 06:55 PM
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Re: Broken Timing Belt.. chances of bent valves?

i have never once as a mechanic seen an interference motor break a belt and not bend valves if you pull the cams it us usually visible that some of the valves are lower than others . it would be a waste of time to put a belt on . i will bet my bank account that there are bent valves . the starting part dosnt matter the fact that it broke with the engine in motion seals the deal at that point youre pretty well effed ..
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Old 03-18-2011, 07:10 PM
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Re: Broken Timing Belt.. chances of bent valves?

i agree with element 600rr,do compression check confirm the damage ,take the head of ,and have shop rebuildit and your good to go .
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Old 03-18-2011, 07:18 PM
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Re: Broken Timing Belt.. chances of bent valves?

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Originally Posted by element600rr View Post
i have never once as a mechanic seen an interference motor break a belt and not bend valves if you pull the cams it us usually visible that some of the valves are lower than others . it would be a waste of time to put a belt on . i will bet my bank account that there are bent valves . the starting part dosnt matter the fact that it broke with the engine in motion seals the deal at that point youre pretty well effed ..
Well that is weird because there have been several preludes just on this site that have broken their timing belt and had no damage.
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Old 03-18-2011, 08:05 PM
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Re: Broken Timing Belt.. chances of bent valves?

you cant really do a compression test on a block with a blown timing belt. what you want to do is a leak down test. you can pick up a spark plug thread to standard air line adapter and some other stuff or just buy the tool but basically, you are going to orient your cams to tdc pull the plugs and insert fitting into apsrk plug hole. you are going to pressurize your combustion chamber then cutoff the air supply with a shutoff valve that has an air pressure gauge. watch the gauge. if it droppes back off to 0 in a few seconds or you hear air pissing out, thats bad. also with the cams at tdc if you set your air compressor to 60 psi lets say, and feed the hose down your spark plug tube and turn on the air, it has three places to go.
1 out your intake. if you have a cold air or ram style intake its real easy to feel the air rushing out if you take the filter off

2 out your exhaust manifold. have a bud go to your tailpipe and see if theres air rushing out.

3 around your pistons into the bottom end or through a blown gasket into your coolant. this is unlikely though since your car was running fine till it quit.

both 1 and 2 will be very audible in the intake and exhaust manifold if you have the plug thread adapter because you wont hear the air rushing in through your hose.

if you are not sure how to get your cams at top dead center that fine. you can fire up your air hose in one spark plug tube and you can manually turn the cam so that you dont hear any escaping air. if you cant stop the air from rushing out then thats 100% proof that you valves arent seating right.

have fun with this.
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Old 03-19-2011, 01:19 AM
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Re: Broken Timing Belt.. chances of bent valves?

drjless post makes sense
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Old 03-19-2011, 02:10 AM
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Re: Broken Timing Belt.. chances of bent valves?

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Originally Posted by keeganhmorgan View Post
Well that is weird because there have been several preludes just on this site that have broken their timing belt and had no damage.
ok then . well it is very simple to pull the cams and check the valve height before you go through the motions of putting a belt on it . i would just hate for him to waste his time or money to just have to do the job a second time anyway . btw ive seen 3 preludes with broken tb one h23 and 2 h22s and all 3 had 4 bent valves each 2 intake 2 exhaust ..
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Old 03-19-2011, 12:19 PM
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Re: Broken Timing Belt.. chances of bent valves?

It is a gamble. You have been offered good advise by others above. If you decide to keep it and need a head there are a few of us with them laying around.


Where are you at? If your near me I would check it out and find out if valves are bent or not. Not that difficult to do. I am in Northern Illinois.

Last edited by Medicdiver; 03-19-2011 at 12:23 PM.
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