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Thread: 3G Alternator Belt Squeal

  1. #41
    Beater gonna beat sly's Avatar
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    I had to grind the bracket down to allow the alternator to pivot more towards the passenger side of the car to get the belt on the 130A I put in the 88 MGM I used to have. Took off about a quarter inch of material or so. This is the area between the mounting bolt ears. The lip on the crank side of that bracket is just too tall to allow the 130A to pivot enough.

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  2. #42
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    Quote Originally Posted by sly View Post
    I had to grind the bracket down to allow the alternator to pivot more towards the passenger side of the car to get the belt on the 130A I put in the 88 MGM I used to have. Took off about a quarter inch of material or so. This is the area between the mounting bolt ears. The lip on the crank side of that bracket is just too tall to allow the 130A to pivot enough.
    That's exactly what I had to do to my bracket; ground the bolt tube (next to the alternator mount) down in order for the alternator to pivot.

  3. #43

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    The alternator shop really knocked it out of the park. They had the alternator back to me in 4 hours. Cleaned up the case, clear coated it, new slip rings, bearings, rectifier and brushes. Going to put it in tonight. Will report on its performance.


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  4. #44
    I'm an air-conditioned gypsy gadget73's Avatar
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    I must be the only person who owns a box that just put a 130 amp on without grinding anything or using an odd size belt. I stuck it together in a friend's driveway with Scott's tech advice after the stock one fried at a car meet. 95 Mustang 3.8L I think was the application. I have an underdrive pulley so the belts are odd size now but until then it was just the stock length alternator belt.

    86 Lincoln Town Car (Galactica).
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  5. #45

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    After getting sidetracked the other night I finally got the alternator chucked back on last night. With all the big electrical consumers on at idle I was getting 13.7 volts. Overall, Iím happy.


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  6. #46
    GMN Regular DerekTheGreat's Avatar
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    Quote Originally Posted by gadget73 View Post
    I must be the only person who owns a box that just put a 130 amp on without grinding anything or using an odd size belt...
    I used the same belt I had with my original 2G as well. I ordered an alternator from a Windstar or something though, should have went with the Mustang one. Windstar unit has a boss or tab on it for something else which doesn't allow a person to adjust all the way (if needed).
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  7. #47
    I'm an air-conditioned gypsy gadget73's Avatar
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    Tortise alt has one of those too, but I don't seem to remember it being really in the way. The Mustang one doesn't swing quite all the way over either but it never seemed to be a big problem.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

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  8. #48
    2 decades of DDing Box Panthers, now in a Whale VicCrownVic's Avatar
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    I've never done any grinding on my brackets, but I have ran the stock box sized belt. All three 3Gs that I have had all had a different size pully. Not much different but enough that I was not able to run stock sized belt on all of them.
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  9. #49
    I'm an air-conditioned gypsy gadget73's Avatar
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    Mine was eventually swapped to an original 2g pulley. Those are slightly smaller. with the underdrive crank pulley I was having problems at night when I had the electric fans still. The smaller pulley gave it a bit more speed and helped. Removing the electric fan helped more though.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  10. #50

    Default 3G Alternator Belt Squeal

    Quote Originally Posted by gadget73 View Post
    Mine was eventually swapped to an original 2g pulley. Those are slightly smaller. with the underdrive crank pulley I was having problems at night when I had the electric fans still. The smaller pulley gave it a bit more speed and helped. Removing the electric fan helped more though.
    Thatís a good pulley to use as I believe itís 1.9 inches in diameter. You want as much alternator shaft RPM at idle as you can get without over speeding it at redline. 1800-2000 RPM is a good target. Some sources say 15000 RPM others say 16000 RPM for max shaft speed.

    With how slow our engines idle and with our 4200 RPM redlines we need those small pulleys.


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    Last edited by matth825; 11-23-2020 at 01:06 PM.

  11. #51
    I'm an air-conditioned gypsy gadget73's Avatar
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    Mine will wind up to a solid 5500 but with an underdrive crank pulley I don't know what rpm the alternator ends up at. Offhand I do not remember how big it is so I can't just do the math. The underdrive crank pulley went on after I blew up a heater core at somewhere north of 100 mph in third gear. If you've never had your windshield go opaque at a high rate of speed, I can tell you its exciting in all the wrong ways.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  12. #52
    GMN Regular DerekTheGreat's Avatar
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    I'm thinking when I have mine replaced I'll put a valve in line with it so I can bypass it for summer. I don't really drive the thing during the winter. Non sloshy days are rare around here during the winter.
    1985 LTD Crown Victoria - SOLD
    1988 Town Car Signature - Current Party Barge

  13. #53

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    Quote Originally Posted by gadget73 View Post
    Mine will wind up to a solid 5500 but with an underdrive crank pulley I don't know what rpm the alternator ends up at. Offhand I do not remember how big it is so I can't just do the math. The underdrive crank pulley went on after I blew up a heater core at somewhere north of 100 mph in third gear. If you've never had your windshield go opaque at a high rate of speed, I can tell you its exciting in all the wrong ways.
    Iíve never had that happen but can imagine it wasnít very much fun at the time! Makes for a good story and glad you got the car stopped!


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  14. #54
    I'm an air-conditioned gypsy gadget73's Avatar
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    Quote Originally Posted by DerekTheGreat View Post
    I'm thinking when I have mine replaced I'll put a valve in line with it so I can bypass it for summer. I don't really drive the thing during the winter. Non sloshy days are rare around here during the winter.
    Sly found some nifty vacuum controlled valve that can be installed to auto-bypass the core when it gets vacuum applied. I want to say he had it plumbed so it shut the core off when AC was in recirc mode but forget specifics. Can prob find the thread on here somewhere. Should give a boost to AC performance especially if the air door seals are imperfect. Can't just shut flow off with a simple valve, the ECT is in that line and no flow will cause that to never heat up. The ECM will mess up the fuel mix if it thinks the engine never gets up to temp.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  15. #55
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    No grinding here either. The only thing I had to do was get an alternator bracket from a 100amp alternator equipped cvgm as I got a large case 3G from a taurus.

  16. #56
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    Quote Originally Posted by gadget73 View Post
    Sly found some nifty vacuum controlled valve that can be installed to auto-bypass the core when it gets vacuum applied. I want to say he had it plumbed so it shut the core off when AC was in recirc mode but forget specifics. Can prob find the thread on here somewhere. Should give a boost to AC performance especially if the air door seals are imperfect. Can't just shut flow off with a simple valve, the ECT is in that line and no flow will cause that to never heat up. The ECM will mess up the fuel mix if it thinks the engine never gets up to temp.
    Ranger/Explorer heater control valve. Part number 74809. Apply vacuum to bypass heater core.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  17. #57
    GMN Regular DerekTheGreat's Avatar
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    OOo nifty. Thank you sly & gadget

    What to tee off of for vacuum when in recirc mode? That's pretty much all I use, only I don't have the ability to manually engage it since I have ATC, so full cold running low or medium blower speed usually keeps it in recirc.
    1985 LTD Crown Victoria - SOLD
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  18. #58
    I'm an air-conditioned gypsy gadget73's Avatar
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    maybe the air door for the dash vents. Unless you use those with hot air. Tying it to the recirc door works in the summer but if you set it for full heat that also goes recirc and would kind of defeat the purpose.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  19. #59
    GMN Regular DerekTheGreat's Avatar
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    Guess I could just do a manual bypass valve. I do indeed do full hot, well, before the heater core blew a hole in itself and I stopped driving it when cold.
    1985 LTD Crown Victoria - SOLD
    1988 Town Car Signature - Current Party Barge

  20. #60
    Beater gonna beat sly's Avatar
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    I ran the thing off panel vent vacuum. Don't need heat when blowing it in my face in the middle of summer.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

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