CH302K
Registered User
I hace a 1993 f350 dually with a 7.3 non turbo.My keeps flying off.It stays on for about one month.A new belt twice now.Any help for me with this?
Thanks
Chuck
Thanks
Chuck
Last edited:
BELT WON'T STAY ON
- Thread starter CH302K
- Start date
justinray
Contributor
Check the alignment of the pulleys, check for play in ALL of the pulleys, including idler and tensioner, I presume the tensioner is holding tension?
Is this a serpentine belt, as I assume it is?
What tensioner do you have? Is it with or without the little shock? How old is it?
Are all the backside of belt surfaces of pulleys in good condition?
Are all the grooved pulleys in good condition?
Are any bearings showing wear by allowing pulleys to flex/move causing wandering?
More details please.
What tensioner do you have? Is it with or without the little shock? How old is it?
Are all the backside of belt surfaces of pulleys in good condition?
Are all the grooved pulleys in good condition?
Are any bearings showing wear by allowing pulleys to flex/move causing wandering?
More details please.
CH302K
Registered User
It is serpentine belt.It has a spring tensioner.No little shock.I will have to assume it has 199,000 miles on it.Pulleys look fine.When the belt spit off,I did spin and shake the pulleys.They all seemed fine.
CH302K
Registered User
It all looks good.It has a spring tensioner with 199,000 miles on it.Could that wear out?
justinray
Contributor
It could, but mine hasnt with similar mileage.
have you noticed any wear on one side or the other...in all likely hood the tensioner is getting weak, I suspect that the new belts have no dust or wear on them and grip better and over time as they get a little polish on them it could invariably slip off if tensioner is not as strong as it should be...
Just my suspicion...other's will likely chime in with more/different/better ideas...
Al
Just my suspicion...other's will likely chime in with more/different/better ideas...
Al
justinray
Contributor
Agreed^
icanfixall
Official GMM hand model
Generally its known with that many miles on the belt the idler pulley rounds off so the belt gets thrown. Remove the belt and idler and look closely at the pulley. If its curved get another one. They are cheap on ebay or Nappa. Also use a mirror to look at the front of the spring tensioner. There is a measured scale on there that tells you the tensioner is in its range to work well.
Pull the mounting bolt out of the tensioner, it has like a nylon sleeve on it, it wears and lets the pulley droop a little and the belt flies off. Did on mine.
with that kind of mileage you can pretty well bet that the tensioner and both pulleys are gonners. they are fairly cheap though so, just get new ones check the wear on the vacuum pump pulley as well, they can get a nasty groove in them. the tensioner will come with one pulley, the catalogs usually dont list the other, but just bring it in and match it up, its a common size
also what brand belt are you getting and what size and where are you getting it? different stores push different sizes and brands for the application and some like to fling off, ironically the *tighter* belts will come off faster than a closer to proper fit belt
CH302K
Registered User
Kinda was thinking the same thing.
Thanks
Thanks
May want to look for something like this
http://www.ebay.com/itm/7-3-FORD-DI...Parts_Accessories&hash=item3cc85e4504&vxp=mtr
http://www.ebay.com/itm/7-3-FORD-DI...Parts_Accessories&hash=item3cc85e4504&vxp=mtr
That is a hell'va buy for one with the shock on it. I paid $110 for the spring loaded one, and didn't even need it.
