Belt tensioner marks - is this right?
#1
Belt tensioner marks - is this right?
Recently installed Original Air conversion on my Firebird and this is the belt they supplied. It appears to be a standard length belt (Dayco 945K6) but it seems pretty tight to me. I have posted a photo of the tensioner marks - can someone chime in and tell me whether this looks okay or not?
#2
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Re: Belt tensioner marks - is this right?
If it went on, it's fine. Regardless of marks.
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Re: Belt tensioner marks - is this right?
A belt isn't going to wear a crank bearing. It'll wipe out a bunch of little light-duty 6203 which is in the front of the alt and the tensioner and idler, LONG BEFORE the crank will even be able to notice it.
If you could get it on, it's fine. That's one of the virtues of the tensioner system; it's basically impossible to overtighten the belt. It'll stretch over time anyway. That just means it'll be longer before you have to buy another one.
If you could get it on, it's fine. That's one of the virtues of the tensioner system; it's basically impossible to overtighten the belt. It'll stretch over time anyway. That just means it'll be longer before you have to buy another one.
#7
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Re: Belt tensioner marks - is this right?
A belt isn't going to wear a crank bearing. It'll wipe out a bunch of little light-duty 6203 which is in the front of the alt and the tensioner and idler, LONG BEFORE the crank will even be able to notice it.
If you could get it on, it's fine. That's one of the virtues of the tensioner system; it's basically impossible to overtighten the belt. It'll stretch over time anyway. That just means it'll be longer before you have to buy another one.
If you could get it on, it's fine. That's one of the virtues of the tensioner system; it's basically impossible to overtighten the belt. It'll stretch over time anyway. That just means it'll be longer before you have to buy another one.
I'll preface this with saying that I'm on vacation, so I cant give photos for a couple of days. With a new tensioner, and a shorter belt I was in this maximum range. I had an issue with my rear main thrust clearance that required me to pull the lower half apart. My front upper main bearing was prematurely worn in the area that holds the load of the belt. Now it's possible that some wind pushed the crank into this area of the bearing as I drove 500mph, but I think it's more likely that a belt was too tight. Why risk the cost and hassle of main bearing damage if you can just buy a longer belt that puts the tensioner gauge into a better operating range?
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#8
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Re: Belt tensioner marks - is this right?
I'm not at home and won't be for a couple of days, but I had to guess on mine twice to get it in a better range. Just run up to your parts store, tell them what you're doing and they'll probably let you try 1 or 2 in the parking lot. Try moving up in size by 10mm or so at a time. You may already know, but here's how to decipher the belts PK number from Gates website.
https://www.gates.com/resources/resource-library/tech-tips/read-a-pk-number-on-a-abds-serpentine-belt
. HOW DO I READ A PK NUMBER? The PK number is broken down into three pieces of information: » Number of ribs on the belt » Belt application information » Effective length of the belt expressed in millimeters EXAMPLE: 6PK1003 » 6 - This indicates the number of ribs on the belt; therefore, this is a 6-rib belt. » PK The P indicates a metric designation, and the K indicates the belt is automotive per SAE J1459. » 1003 - This is the effective length of the belt expressed in millimeters.
https://www.gates.com/resources/resource-library/tech-tips/read-a-pk-number-on-a-abds-serpentine-belt
. HOW DO I READ A PK NUMBER? The PK number is broken down into three pieces of information: » Number of ribs on the belt » Belt application information » Effective length of the belt expressed in millimeters EXAMPLE: 6PK1003 » 6 - This indicates the number of ribs on the belt; therefore, this is a 6-rib belt. » PK The P indicates a metric designation, and the K indicates the belt is automotive per SAE J1459. » 1003 - This is the effective length of the belt expressed in millimeters.
#9
Re: Belt tensioner marks - is this right?
Thanks all for the input. FWIW, about 75 miles after installing this belt, the alternator bought it. True, it was the original alternator (28 years old) but with only ~17,000 miles. And there is a subtle "tweek-tweek-tweek" when it spins, so that makes me suspicious of this belt situation. Maybe it would be okay, but I tend to be cautious about these things, so I think I'll try a 1/2-inch longer belt and see how it looks. Once again, thanks for all the comments.
#10
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Re: Belt tensioner marks - is this right?
oh, hell... I'm arguing with sofakingdom. What fun this will be.
I'll preface this with saying that I'm on vacation, so I cant give photos for a couple of days. With a new tensioner, and a shorter belt I was in this maximum range. I had an issue with my rear main thrust clearance that required me to pull the lower half apart. My front upper main bearing was prematurely worn in the area that holds the load of the belt. Now it's possible that some wind pushed the crank into this area of the bearing as I drove 500mph, but I think it's more likely that a belt was too tight. Why risk the cost and hassle of main bearing damage if you can just buy a longer belt that puts the tensioner gauge into a better operating range?
I'll preface this with saying that I'm on vacation, so I cant give photos for a couple of days. With a new tensioner, and a shorter belt I was in this maximum range. I had an issue with my rear main thrust clearance that required me to pull the lower half apart. My front upper main bearing was prematurely worn in the area that holds the load of the belt. Now it's possible that some wind pushed the crank into this area of the bearing as I drove 500mph, but I think it's more likely that a belt was too tight. Why risk the cost and hassle of main bearing damage if you can just buy a longer belt that puts the tensioner gauge into a better operating range?
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