Alternator Squeal
Thread Starter
|
4wd Low
Joined: Oct 2017
Posts: 11
Likes: 0
Alternator Squeal
1986 F150 with a 4.9L converted to an offy with 390 Holley and DUI ignition
My alternator is squealing like crazy. I have replaced the alt, and the belts.The pulley could be better but I have never had this problem before.
Now, this is where it gets odd. When I start the truck the alternator squeals, but when I shut the truck down it does not (tapped into something to that keeps my ignition on for 10 seconds)
This the squeal
This is when the squeal stops. It seems the squeal goes away when the alt is not excited. Also, no squeal when I remove the plugs from the alt so that is it in a freewheel state.
My alternator is squealing like crazy. I have replaced the alt, and the belts.The pulley could be better but I have never had this problem before.
Now, this is where it gets odd. When I start the truck the alternator squeals, but when I shut the truck down it does not (tapped into something to that keeps my ignition on for 10 seconds)
This the squeal
This is when the squeal stops. It seems the squeal goes away when the alt is not excited. Also, no squeal when I remove the plugs from the alt so that is it in a freewheel state.
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta
We assume the belt has the proper tension.
What belt are you using? Gates belts seem to be notorious for squealing.
And if the Alt pulley is worn this can cause it as the sheave won't be making full contact on the belt and it'll limit the torque it is capable of handling before slippage occurs.
So a couple things to explore.
What belt are you using? Gates belts seem to be notorious for squealing.
And if the Alt pulley is worn this can cause it as the sheave won't be making full contact on the belt and it'll limit the torque it is capable of handling before slippage occurs.
So a couple things to explore.
Lead Driver
Joined: Nov 2013
Posts: 7,174
Likes: 1,174
What's with the tach in the second video? Is it dead?
On a possibly unrelated note, you may want to replace that emergency battery terminal as seen in the first video. I've fixed many no-start/slow-start faults by either installing a crimp-on terminal or replacing the entire cable. This could be possibly related to the squeal if the charging current is restricted on the way to the battery, so the regulator is commanding maximum output all the time:
Tuned
Joined: May 2013
Posts: 396
Likes: 5
From: Ottawa, Canada
You have your belts set up differently than my 85 f150 4.9 non airconditioning. It looks like you have them setup wrong...
Mine has dual belts on the alternator, water pump and crank. The power steering pump attached only to the crank pulley on the front most spot.
Perhaps that along with:
1. Loose belt
2. Crooked pulley
3. One belt driving the water pump and alternator...
Could be causing slippage.
Make sure they are lined up straight with each other, Tighten them, reroute them to how I mentioned above with dual belts on the alternator... in that order.
Let us know how it goes
Jason
Mine has dual belts on the alternator, water pump and crank. The power steering pump attached only to the crank pulley on the front most spot.
Perhaps that along with:
1. Loose belt
2. Crooked pulley
3. One belt driving the water pump and alternator...
Could be causing slippage.
Make sure they are lined up straight with each other, Tighten them, reroute them to how I mentioned above with dual belts on the alternator... in that order.
Let us know how it goes
Jason
Thread Starter
|
4wd Low
Joined: Oct 2017
Posts: 11
Likes: 0
Also I forgot to add that the pulley on the alt gets incredibly hot.
Jason,
Mine had AC but I took most everything out for it and that is how the belts were set up.
So you have a belt that is crank, water pump, alt.
a belt from the water pump to the alt.
A belt from crank to PS
KR98664,
So the wiring was jacked when I got the truck. I pulled out the most of the emissions and the stock intake and carb. To run the ignition I pulled from the bat with a fused wire to a relay. To trip the relay I poked around the wiring till I found a hot with the ignition in the accessory/on position. The wire I tapped into holds a charge for about 10-15 seconds after I turn the ignition switch off.
Tach is dead
Franklin2
The bat that is in the video is old but I had just changed to that one from a 2 day old battery.
Jason,
Mine had AC but I took most everything out for it and that is how the belts were set up.
So you have a belt that is crank, water pump, alt.
a belt from the water pump to the alt.
A belt from crank to PS
KR98664,
So the wiring was jacked when I got the truck. I pulled out the most of the emissions and the stock intake and carb. To run the ignition I pulled from the bat with a fused wire to a relay. To trip the relay I poked around the wiring till I found a hot with the ignition in the accessory/on position. The wire I tapped into holds a charge for about 10-15 seconds after I turn the ignition switch off.
Tach is dead
Franklin2
The bat that is in the video is old but I had just changed to that one from a 2 day old battery.
FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
Also I forgot to add that the pulley on the alt gets incredibly hot.
Jason,
Mine had AC but I took most everything out for it and that is how the belts were set up.
So you have a belt that is crank, water pump, alt.
a belt from the water pump to the alt.
A belt from crank to PS
KR98664,
So the wiring was jacked when I got the truck. I pulled out the most of the emissions and the stock intake and carb. To run the ignition I pulled from the bat with a fused wire to a relay. To trip the relay I poked around the wiring till I found a hot with the ignition in the accessory/on position. The wire I tapped into holds a charge for about 10-15 seconds after I turn the ignition switch off.
Tach is dead
Franklin2
The bat that is in the video is old but I had just changed to that one from a 2 day old battery.
Jason,
Mine had AC but I took most everything out for it and that is how the belts were set up.
So you have a belt that is crank, water pump, alt.
a belt from the water pump to the alt.
A belt from crank to PS
KR98664,
So the wiring was jacked when I got the truck. I pulled out the most of the emissions and the stock intake and carb. To run the ignition I pulled from the bat with a fused wire to a relay. To trip the relay I poked around the wiring till I found a hot with the ignition in the accessory/on position. The wire I tapped into holds a charge for about 10-15 seconds after I turn the ignition switch off.
Tach is dead
Franklin2
The bat that is in the video is old but I had just changed to that one from a 2 day old battery.
Did this start after you pulled everything off?
So you have a belt that is crank, water pump, alt.
a belt from the water pump to the alt.
a belt from the water pump to the alt.
Dave ----
Trending Topics
Thread Starter
|
4wd Low
Joined: Oct 2017
Posts: 11
Likes: 0
Dave,
No everything worked fine, I know everyone says that. The truck sat for about 3 months as I sorted out the exhaust. Got the exhaust sorted and fired the truck and the squeal appeared.
"So you have a belt that is crank, water pump, alt.
a belt from the water pump to the alt."
I was just asking jason how he had his set up. I have just 2 belts. 1.) Crank, WP, Alt 2.) crank, WP, PS The third groove is empty, former AC belt)
No everything worked fine, I know everyone says that. The truck sat for about 3 months as I sorted out the exhaust. Got the exhaust sorted and fired the truck and the squeal appeared.
"So you have a belt that is crank, water pump, alt.
a belt from the water pump to the alt."
I was just asking jason how he had his set up. I have just 2 belts. 1.) Crank, WP, Alt 2.) crank, WP, PS The third groove is empty, former AC belt)
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Cargo Master
Joined: Mar 2002
Posts: 3,132
Likes: 218
From: W (BY GOD) V
Now, this is where it gets odd. When I start the truck the alternator squeals, but when I shut the truck down it does not (tapped into something to that keeps my ignition on for 10 seconds)
This is when the squeal stops. It seems the squeal goes away when the alt is not excited. Also, no squeal when I remove the plugs from the alt so that is it in a freewheel state.
This is when the squeal stops. It seems the squeal goes away when the alt is not excited. Also, no squeal when I remove the plugs from the alt so that is it in a freewheel state.
Use a water spritzer bottle and hit the ALT pulley while running.
Post Fiend
Joined: Feb 2008
Posts: 5,831
Likes: 121
From: St Albert, Alberta
To the uneducated and ill informed it may seem like another one of those snake oil items but it is far from it.
Belt dressings are used on industrial belt drives and conveyor systems to help stop belt squeal and prolong the life of the belts and sheaves it is used all the time in those applications.
So don't be so quick to write it off as a possible solution just you are not aware what it actually does or is for.
FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
To the uneducated and ill informed it may seem like another one of those snake oil items but it is far from it.
Belt dressings are used on industrial belt drives and conveyor systems to help stop belt squeal and prolong the life of the belts and sheaves it is used all the time in those applications.
So don't be so quick to write it off as a possible solution just you are not aware what it actually does or is for.
Belt dressings are used on industrial belt drives and conveyor systems to help stop belt squeal and prolong the life of the belts and sheaves it is used all the time in those applications.
So don't be so quick to write it off as a possible solution just you are not aware what it actually does or is for.
If it started to squeal tighten it up or replace the belts and yes belts some up to 5 belts.
Thing was you had to get a matched set or better yet a belt mat with the number of belts needed for then AHU/fan.
We also went to cogged belts & drives to cut down on slippage as it was wasted energy. Some of the bigger AHU had variable speed drives to cut back the RPM of the motor/fan to save energy.
This was in a hospital.
Dave ----