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#1 |
Senior Member
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Location: Toano, VA
Posts: 874
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Belt Woes..
Ever since I got this truck the alternator belt has given me so many issues. The second day I had the truck the alternator belt wrapped itself around the fan and just tore itself to shreds.
I replaced it in the parking lot and got home, ever since then my belt has just been giving me issues. I replaced the alternator today, and tightened the belt as much as my back would allow up on that big tire. Yet as soon as I left work my voltage dropped and I could smell the belt burning/slipping on the pulley. And then I pulled over to inspect, but the belt has cut itself in half and flown off! Whats going on? I tighten it as much as I humanly can but still slips and comes off. I've heard of deeper V belt pulleys helping but I am not sure on what to do. Maybe a special tool to yank the alternator to put more tension on my belt? Its a built 454 with AC, PS but no air/smog pump.
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"Sometimes I do serve as a good bad example. Glad to be of service." My Build Thread (1967 C10, lowered, EFI, daily truck): http://67-72chevytrucks.com/vboard/s...d.php?t=830809 |
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#2 |
60-66 Nut
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Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: Belt Woes..
It is impossible to say without seeing what you have, but it sounds like an alignment issue with the pulleys. Is this in the '84 K30 in your signature?
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#3 |
Registered User
Join Date: Sep 2008
Location: San Carlos, Ca.
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Re: Belt Woes..
Miss alignment or possibly one or more of the accessories are dragging causing too much strain on the belt? If you look from the side of the belt(s), they should be darned near in line with each other. If one pulley is slightly off, you can have some problems. Id also try watching (make sure to stay out of the line of the belt) all of the pulleys while the engine is running to see / hear if you can pinpoint the problem. The belts on my 396 required a little maintenance more than I liked. I went with a factory serpentine set up and never looked back. No power steering belt squeal since.
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Chris '63 k15 long step Vortec 7.4 - L29 Blackbear tune, Five 0 Motorsports injectors, Chris Straub Cam, NV4500, divorced 205 ![]() 52" front and 63" rear spring swap D44 / 14bff - disc axles Milemarker 9K and 10.5K hydraulic winches 63" & B52 Spring Install http://67-72chevytrucks.com/vboard/s...ng+swap+thread NV4500 Reverse Build Thread http://67-72chevytrucks.com/vboard/s...=reverse+build L29 - 7.4 Vortec Build http://67-72chevytrucks.com/vboard/s...&highlight=L29 |
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#4 |
Senior Member
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Location: Toano, VA
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Re: Belt Woes..
Yes this is on my '84 K30. I looked to see if I could visibly notice any misalignment on the belt system but I can't see anything. I will double check though.
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"Sometimes I do serve as a good bad example. Glad to be of service." My Build Thread (1967 C10, lowered, EFI, daily truck): http://67-72chevytrucks.com/vboard/s...d.php?t=830809 |
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#5 |
*** That's interesting ***
Join Date: Oct 2008
Location: Pittsburgh, PA
Posts: 2,772
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Re: Belt Woes..
V-belts are not supposed to ride deeply in the groove. Too much friction is generated that way. I'd lean more toward a wider belt if you can find one. Ideally, the flat side should be flush with the pulley.
If there is any way to post a picture of your setup, perhaps a side view so we can look at alignment, that might help.
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Tom ![]() Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... |
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#6 |
Senior Member
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Location: Toano, VA
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Re: Belt Woes..
I'll get some taken and post them soon. My coolant/heater and AC lines are in the way some so it'll be hard to view but I'll post some up.
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"Sometimes I do serve as a good bad example. Glad to be of service." My Build Thread (1967 C10, lowered, EFI, daily truck): http://67-72chevytrucks.com/vboard/s...d.php?t=830809 |
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#7 |
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#8 |
Senior Member
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Re: Belt Woes..
heres some more.
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"Sometimes I do serve as a good bad example. Glad to be of service." My Build Thread (1967 C10, lowered, EFI, daily truck): http://67-72chevytrucks.com/vboard/s...d.php?t=830809 |
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#9 |
Registered User
Join Date: Jun 2014
Location: lakefield,mn
Posts: 566
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Re: Belt Woes..
The alignment looks good, but it looks like your alt pulley is to wide. The top of the belt should be even with the top of the pulley. Just like your other pulleys.
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#10 |
Senior Member
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Location: Toano, VA
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Re: Belt Woes..
Yeah I noticed that myself earlier taking the pic.. the alternator is literally two days and maybe 25 miles old, and look at that belt dust on it. I supposed I can find an alternator pulley to fit? Too bad the dudes at carquest took mine without me getting the pulley back.. stupid cores..
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"Sometimes I do serve as a good bad example. Glad to be of service." My Build Thread (1967 C10, lowered, EFI, daily truck): http://67-72chevytrucks.com/vboard/s...d.php?t=830809 |
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#11 |
Senior Member
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Location: Toano, VA
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Re: Belt Woes..
I'll post some photos of an extra alternator pulley I have.
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#12 |
Senior Member
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#13 | |
Registered User
Join Date: Nov 2012
Location: Mexico, NY
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Re: Belt Woes..
Quote:
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#14 |
Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
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Re: Belt Woes..
Here is a similar alternator and pulley on my truck.
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#15 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
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Re: Belt Woes..
Belt is too deep in the groove of the pulley.
You can see from this pic you posted that the belt is actually twisting as it comes out of the pulley. It's also only contacting the outer top edge of the V on the belt. Gary
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#16 |
Senior Member
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Location: Hayes Va
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Re: Belt Woes..
There is something else going on. The high performance GM big blocks ran deep grove pulleys to help keep the belts on. Nothing wrong with a deep groove pulley. I would look at the crank and water pump pulleys for wear. If one has a bad wear pattern in it it will eat the belts. Also you can over tighten the belt and speed up the failure if a grove is worn out. The lean in the top of the belt on the alternator looks like it is being caused by the water pump pulley. I has a lean in it also.
Jimmy
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#17 |
Senior Member
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Location: East Tennessee
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Re: Belt Woes..
Look for a cracked or broken bracket on all the belt driven stuff....also I had one that had the bolt on the radiator hose clamp too close to the belt....it didn't touch until the engine revved up then it would contact and sling the belt off...
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#18 |
*** That's interesting ***
Join Date: Oct 2008
Location: Pittsburgh, PA
Posts: 2,772
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Re: Belt Woes..
Yeah, alignment seems OK. Belts are forgiving and can withstand a little bit of misalignment. But a cracked bracket (as mentioned) could cause an accessory to flex into a worse position under load. So definitely check for that.
I don't like how that belt is riding through the alternator pulley. As mentioned, something is causing a slight twist and ride too low in the groove. That particular pulley looks like it's made for a wider belt. Whereas the water pump pulley seems right for that belt width. If you watch the WP and crank pulleys turn as the engine idles, do you notice it being out of round or wobble at all? What about the alternator? You said your old alternator was doing this too? So swapping pulley's won't matter. But I do like the spare pulley that you were holding in your hand in that pic. Can you try that one? There is such a thing as too tight. Lacking a belt tension gauge, the next best thing is to push on the belt in the middle of the longest run with your index finger and you should feel strong resistance at 1" flex. Meaning it shouldn't have any more flex beyond 1" pushing with a finger. But should allow up to about 1/2" of flex. Any less than about 1/2" on a used belt means it's too tight. A brand new belt may have as little a 1/3" flex but once run, even once, it's now considered used. This is all a generality but is a reasonable reference to start with. FSMs usually call out their own methods of testing proper tension for each accessory.
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Tom ![]() Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... |
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#19 |
Senior Member
![]() Join Date: Mar 2014
Location: Toano, VA
Posts: 874
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Re: Belt Woes..
Went back to Carquest and got my old pulley back, slapped the new one on and it seems to be working okay. It sits nice and flush with good contact on the pulley, when I took it for a drive it squeaked some but it cleaned up right after and was charging the battery properly. Everything else seems fine, I only tightened it up as much as I could with no other assistance, so its tension is about equal with the other belts. I will be replacing the other belts in the system sometime soon, as they are old and a little dry, and I will check all my pulleys for bad patterns.
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"Sometimes I do serve as a good bad example. Glad to be of service." My Build Thread (1967 C10, lowered, EFI, daily truck): http://67-72chevytrucks.com/vboard/s...d.php?t=830809 |
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#20 |
Registered User
Join Date: Feb 2013
Location: central California
Posts: 2,735
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Re: Belt Woes..
My crank pulley wore out. Drove me crazy 'till I figured it out. Not the first thing one thinks of when trying to diagnose a belt noise that's for sure, but once I finally took it off and inspected it, the wear was pretty bad.
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454, belts, big block, pulley |
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