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  #1  
Old 04-23-2006, 08:05 AM
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Join Date: Feb 2006
Location: Central Maine
Posts: 156
Timing Chain Stretch. Picture interpretation Plz

Here is a picture I took when the notch on my camshaft was lined up.

I went around twice to get it just right. Valves adjusted pretty easy. All of the intakes were close.. maybe a little too much clearance. All of the exhausts were tight.

Will I get better economy now? It did seem to have better low range power.

Is this showing 3 degrees of stretch? That is my analysis. Vehicle has 170k miles. I'm guessing with proper oil changes.. I can go till 200k or better without a problem

JP
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Timing Chain Stretch.  Picture interpretation Plz-100_0839.jpg  
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  #2  
Old 04-23-2006, 08:11 AM
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Location: Blue Point, NY
Posts: 25,396
Quote:
Originally Posted by MeinGreaseCar
Is this showing 3 degrees of stretch? That is my analysis. Vehicle has 170k miles. I'm guessing with proper oil changes.. I can go till 200k or better without a problem

JP
Yep, that's 3 or possibly less. You can go indefinitely if you keep the oil clean............

My SD has just about the same elongation at 185K.

My suspicion is that the chain is only at 0 when brand new. After 20K or so, it stretches to a certain point and remains there if the oil is changed religiously.

M/B has a different spec for a brand new chain versus a chain that has 20K on it.......IIRC.
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  #3  
Old 04-23-2006, 08:12 AM
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Location: Central Maine
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Thanks

Brian-

you are right on the ball as usual. Thanks.

Now can you take a look at the other thread I posted? air cleaner pics.

JP

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  #4  
Old 04-23-2006, 12:09 PM
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Join Date: Jan 2000
Location: PA
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Mein,

The timing chain doesn't stretch, it wears. The pins get a slight flat spot and the rollers get an elliptical hole thus the chain becomes longer.

BTW, It looks like 3* to me depending on how well U lined up the marks on the cam.

P E H
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  #5  
Old 04-23-2006, 12:16 PM
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Join Date: Oct 2004
Location: Loganville/Atlanta
Posts: 2,156
Quote:
Originally Posted by P.E.Haiges
Mein,

The timing chain doesn't stretch, it wears. The pins get a slight flat spot and the rollers get an elliptical hole thus the chain becomes longer.

BTW, It looks like 3* to me depending on how well U lined up the marks on the cam.

P E H
Yep that is the case. "chain stretch" is one of those ideas that make it sound like a piece of leather.

The gears will also wrear in the valleys changing the pitch and travel of the pins in the chain and wearing them out or round etc etc etc. You get the point.
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  #6  
Old 04-23-2006, 02:18 PM
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Join Date: Feb 2006
Location: Central Maine
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Marks

It's a little out of focus due to closeness.

It may not be scientific "close" but it's about as good as I could do eyeball

JP
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Timing Chain Stretch.  Picture interpretation Plz-100_0840.jpg  
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