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Old 04-21-2013, 08:37 PM   #1 (permalink)
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Default Defective Timing Belt Part?

I purchased a new Suburu branded timing belt from the dealer. Two of the teeth on the timing belt have metal wire that looks like it may have been used to stitch the belt together. Is this a defective belt or is this normal?
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Old 04-21-2013, 09:01 PM   #2 (permalink)
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I just took a look at the TB I took off of my 2000 OB when it had about 125K miles on it and it has the same wires. So two observations. 1. It isn't unusual and most likely where the belt was stitched together. They had to make it into a loop somehow. 2. I wouldn't trust it for more than about 125K miles.
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Old 04-21-2013, 09:36 PM   #3 (permalink)
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I just took a look at the TB I took off of my 2000 OB when it had about 125K miles on it and it has the same wires. So two observations. 1. It isn't unusual and most likely where the belt was stitched together. They had to make it into a loop somehow. 2. I wouldn't trust it for more than about 125K miles.
Have you seen my video on the timing belt? I wouldn't go much over 100k.

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Old 04-22-2013, 06:53 AM   #4 (permalink)
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cardoc:

Some questions related to the video, to expand on what has already been offered:

What's the issue with the belt in the video? Is it loose because the belt has stretched beyond the tensioner's ability to compensate, or is it because the tensioner isn't functioning properly to maintain the tension? (Either, of course, is a reason to do the timing belt service.)

Is that much stretch seen often with belts after 105k miles of use?

Are the wires in fact stitching of two joined ends of the belt?

If so, is this common construction on these belts?

And, in your experience, do the belts tend to break more often at this point?
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Old 04-22-2013, 08:21 AM   #5 (permalink)
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I inherited the car with 120K miles on it and fixed other stuff that would help me determine if I was going to keep it. When I got to the point of no return on costs and my labor time I did the belt. Took a risk and drove with a sense of dread until I go it done. The 125K remark was one of my lame sarcastic "insights" rather than a suggestion.
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Old 04-23-2013, 08:32 AM   #6 (permalink)
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I have had Gen 1 cars with high mileage that had cracked belts and remained tight. The Gen 2 up cars are tending to be loose when I open them up as seen in the video. All of them. So I am inclined to think the belt is stretching beyond the tensioner's ability since the tensioners are maxed every time. Bando made the belts for early engines. I don't know who makes them now but it seems the stretching is the #1 reason to replace it at the time required.

Yes, stitching looks normal and I haven't had issues with belts breaking at the stitching so I don't worry about it. The 2k Outback 2.5 I just bought and am working on now with 179k miles has a loose belt. Not as loose as the video, I can't slide it off like I did that one, but loose. So I know its been changed at least once.
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Old 04-23-2013, 12:07 PM   #7 (permalink)
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cardoc

Thanks for that info. With the belt as loose as it appears in the video, and the tensioner maxed out, there couldn't have been much grip between the back of the belt and the smooth water pump pulley. Was the car overheating? (Sort of, "loose belt = overheating, while the belt cogs are still able to drive the camshafts".)
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Old 04-23-2013, 05:00 PM   #8 (permalink)
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Quote:
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cardoc

Thanks for that info. With the belt as loose as it appears in the video, and the tensioner maxed out, there couldn't have been much grip between the back of the belt and the smooth water pump pulley. Was the car overheating? (Sort of, "loose belt = overheating, while the belt cogs are still able to drive the camshafts".)
There wasn't a complaint of overheating. Just overdue, and I did some other work to get it caught up.

I'll give viewers another insight. Just based on the odds of occurrence, when you do your spark plugs, do the valve cover seals and tube seals also. Chances are high the tube seals are leaking at the time the sparks are due. And another oddity is that I saw a string, 4 2.5 SOHC engines that all had #1 tube seal deformed from what looked like poor installation. One was an 01, the others were 04-05.
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