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Old 11-05-2001, 04:43 PM   #1
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What are symptoms of loose timing chain?

This is about my daily driver Caprice (85 305). I am getting a new noise out of the engine area, which is a combination of scraping and ticking. The ticking sounds like a card stuck in the spokes of a bicycle wheel. I can't hear the noise when I pop the hood and stand next to the engine and rev it. The noise occurs under load, like a spark knock, but also is present decelerationg from 2nd to first gear (auto trans), which spark knock would not do, I think.
I am just worried that it is the timing chain. Don't want to be stuck somewhere. Sounds like it is coming from around the trans, or rear of the engine, actually. Have had a trans leak for a few years. 330,000 on the engine and trans, all original. You can hear the
How can I rule out timing chain ? Is this clicking / scraping sound the sound of a loose chain ?

Thanks


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Old 11-05-2001, 05:23 PM   #2
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probably not Tchain. They just jump or break without you knowing in most cases.

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Old 11-05-2001, 05:23 PM   #3
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Sounds more like a collapsed lifter to me.

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Old 11-05-2001, 05:24 PM   #4
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Or perhaps an exhaust leak.

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EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat, just switched to 180* b/c of winter coming and going to college in the mts.
3:73 Posi
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B&M Megashifter, 5" Autometer Tach w/shift lite
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Old 11-05-2001, 05:30 PM   #5
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I have a similar sound coming from my engine bay, but only when its cold and under load. I do know that there is an exhaust leak somewhere, so it may be that.

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Old 11-05-2001, 06:18 PM   #6
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Is it a constant ticking? or does it get faster as the car gets faster?
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Old 11-05-2001, 08:04 PM   #7
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with 330,000 miles on the chain im sure its strected to high hell and wouldnt be a bad idea to change, it, but sounds like possibly loose main bearings, they will tick under load and when the engine is cold and stop as the engine gets hot as they will expand.
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Old 11-05-2001, 08:09 PM   #8
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Quote:
<font face="Verdana, Arial" size="2">Originally posted by GTA88:
This is about my daily driver Caprice (85 305). How can I rule out timing chain ? Is this clicking / scraping sound the sound of a loose chain ? </font>
GTA,

You can check for a loose chain by removing the distributor cap, rotating the engine by hand (or socket) clockwise to TDC at the crank timing marks. Once the marks are lined up, rotate teh engine backward until you see the distributor rotor move in the opposite direction. This shoudl be almost immediate, but any lag or delay means some timing chain stretch.


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Old 11-05-2001, 08:15 PM   #9
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Thanks for the replies. Good to hear it is probably not the chain. To answer the questions, the clicking/rattling sound doesn't really vary with the speed of the engine, it's either there or not, sort of like spark knock. And sometimes it is not there at all. And it shows up when cold, warm, or hot. It comes and goes. Oh yeah, there is a popping sound too, sometimes, not always, on acceleration. I suppose it could be a bunch of things, but I am glad to hear it's probably not the chain. Click the image to open in full size.
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Old 11-06-2001, 02:12 AM   #10
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Yeah, what Vader said. Or another way I have found to diagnose whether the timing chain is bad or not, is to use a timing light and watch the timing mark at idle, and if you see the mark kinda wander around 4 degrees or more, that's a indication that the chain is loose. I have found that to be the easiest way to determine a worn timing chain. Simple as hooking up a timing light.

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Old 11-06-2001, 11:00 AM   #11
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Confuzed1,
Last time I did the timing it was moving around only about 1 degree, which I assume is OK. I am going to use the Vader Method (tm) to check it tomorrow. Depending what I find out, I then may have to figure out what effect the stretched chain would have on the "real" timing.
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Old 11-06-2001, 11:00 AM
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