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Strange timing belt failure and other strange symtoms

 
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Old 27 Mar 2016, 02:29 pm
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Default Strange timing belt failure and other strange symtoms

I am currently working on replacing my timing belt. The belt let loose upon starting, but their was a noise, a sort of slapping sound, prior to letting loose.

The strange thing is the belt is not broken. It is worn off at the Crank pulley. The bellt actually looks like it is good condition and is likely a replacement belt done by the previous owner.

Nevertheless, the belt is worn smooth at the crank and it appears almost as if the cams locked up and crank ground off the belt. Another strange symptom was the number one plug tube was filled with dirty oil, but the oil in the engine is clean.

I have never seen a timing belt go like this.

I would like to know that if I do the engine mounts, water pump, and the timing belt I am not investing time and money in an anchor, so if anyone has any info or ideas, as to what caused this strange timing belt wear, I would appreciate it.
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Old 27 Mar 2016, 03:26 pm
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Default Re: Strange timing belt failure and other strange symtoms

Quote:
Originally Posted by StephenB View Post
I am currently working on replacing my timing belt. The belt let loose upon starting, but their was a noise, a sort of slapping sound, prior to letting loose.

The strange thing is the belt is not broken. It is worn off at the Crank pulley. The bellt actually looks like it is good condition and is likely a replacement belt done by the previous owner.

Nevertheless, the belt is worn smooth at the crank and it appears almost as if the cams locked up and crank ground off the belt. Another strange symptom was the number one plug tube was filled with dirty oil, but the oil in the engine is clean.

I have never seen a timing belt go like this.

I would like to know that if I do the engine mounts, water pump, and the timing belt I am not investing time and money in an anchor, so if anyone has any info or ideas, as to what caused this strange timing belt wear, I would appreciate it.
dismantle so you can check pulleys and water pump that they are not locked up, install and time with the new belt. Do a compression check with all spark plugs out. If you get a good reading on the compression , you can remove and replace all your timing items and water pump. Replace the passenger side motor mount that supports the motor with the bolt that goes in from the right wheel well. Oil in spark plug hole is just due to seals that are needed while doing the valve cover gasket.
Timing belt teeth on a belt I did two years ago also cam off, belt was worn out.. on to long.
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Old 27 Mar 2016, 03:31 pm
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Default Re: Strange timing belt failure and other strange symtoms

What year, mileage and history would be good information to have.

You should introduce yourself to the forum.
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Old 27 Mar 2016, 04:38 pm
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Default Re: Strange timing belt failure and other strange symtoms

Sometimes the teeth on these belts just get cracked and weak from time, heat and wear. I doubt that there's a cam problem. I had a SOHC 2.5 Plymouth Acclaim several years ago that did the same thing. I just died on me and when I checked the belt, it looked fine. Then, I had my wife crank the engine and I didn't see the belt turning. There were a LOT of teeth worn off at the crankshaft. I didn't worry about it, just changed the waterpump (didn't have to) timing belt and belt tensioner and went on my happy way. You should do the same and forgetaboutit!
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Old 28 Mar 2016, 08:12 am
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Default Re: Strange timing belt failure and other strange symtoms

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Originally Posted by chuzz View Post
Sometimes the teeth on these belts just get cracked and weak from time, heat and wear. I doubt that there's a cam problem. I had a SOHC 2.5 Plymouth Acclaim several years ago that did the same thing. I just died on me and when I checked the belt, it looked fine. Then, I had my wife crank the engine and I didn't see the belt turning. There were a LOT of teeth worn off at the crankshaft. I didn't worry about it, just changed the waterpump (didn't have to) timing belt and belt tensioner and went on my happy way. You should do the same and forgetaboutit!
Thanks. I have it all torn down and will replace the pump, timng belt and engine mounts.

I also believe I prefer dangerous freedom and liberty over peaceful slavery. Great quote.
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Old 28 Mar 2016, 12:57 pm
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Default Re: Strange timing belt failure and other strange symtoms

Make sure you get a kit with a new tensioner in it, man. And while you're in there, you should probably change that middle motor mount. Call it preventative maintenance. You sure as hell don't want that one broken and have to take it all apart just to do that. I understand it's a pain in the butt to do, but as long as it's going to be apart, just go ahead and do it. You won't regret the decision if you're inclined to keep your PT for years to come.
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