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03-05-2021, 06:14 PM #1Member
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Mercury 3 liter eating up alternator belts
My mercury 3 liter is eating up belts like the damn cookie monster. I've set tension correctly, and after a half hour of running, the belt is usually loose. Much longer and it gets chewed up (especially if I trim the motor up or down, as that seems to put immediate load on the alternator).
Question is, why? Below is a picture showing a straightedge flush with the top of the alternator pulley hovering above the flywheel. Is it possible the alternator is too high (or flywheel too low)? And how would I even fix such a thing?
The other picture shows that paint it peeled off of the flywheel pulley and light rust is present. It's not perfectly smooth, but it doesn't seem bad. Could this be the problem? And how would I take care of that?
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03-05-2021, 07:01 PM #2
That roughness from the rust in the belt groove is chewing up the belt.............
"One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .
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03-05-2021, 09:45 PM #3Member
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03-05-2021, 10:09 PM #4
Lets see a picture of the alternator pulley
"One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .
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03-05-2021, 10:22 PM #5The Historic Photo Master
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03-05-2021, 10:22 PM #6The Historic Photo Master
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03-05-2021, 11:39 PM #7Member
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03-06-2021, 12:06 AM #8"One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .
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03-06-2021, 10:42 AM #9Member
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03-06-2021, 12:57 PM #10
We put new belts on my twin 3.0L last summer. After @ 5 hours they had stretched so I Readjusted them. Last ride of summer turning @6000 I lost charging on one motor, when we got back to the barn I pulled the crowl and the starboard side belt had blown off, Was worn to half the original with and turned inside out!. Since it was the last time out and going to a barn I cant get into all winter to work on it(different storage plans next winter) The alternator got pulled and is going in to a rebuilder to be cleaned and be spun up for a while to see if its getting warm and??. This might be a stupid thought but what if you lay a level on the flywheel and trim the motor til its level then lay a small level on the belt??. We eye balled mine and it seems good. Dunno, Maybe i left it to loose in fear of bearing wear?. My pullies are clean and rust free so?. I just went out and looked at mine on the bench and the pulley matches your's in the pick. Thick on the inside.
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03-06-2021, 01:16 PM #11Member
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I have used a laser bore sighting tool before for checking alignment. They look lie a shell casing that you chamber in a rifle. Lay it in the groove of the pulley and shine it at the opposing pulley surface. Also check your mounting holes for slop if needed you can always ream with a expandable reamer to square up the hole and use a bushing
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03-06-2021, 05:05 PM #12The Historic Photo Master
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03-06-2021, 07:41 PM #13
both of those belt grooves look rusty..... anything other than mirror smooth will eat up belts..... hence the belt dust all over the alternator.
"One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .
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