alternator/vacuum pump belt problems
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Junior User
Joined: Dec 2004
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From: H-Town
alternator/vacuum pump belt problems
Alright, my Dad has a 1990 f250 diesel ( 7.3 w/the banks turbo kit ). Every 8-9 months the truck pitches the alternator and vaccum pump belts. There is also a lot play in the alternator to the crank shaft. He uses gates belts. Are there any factory tech notes to this problem? Anyone else have these problems? If so, what is the solution to this problem. Thanks very much.
Posting Guru
Joined: Sep 2002
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From: Northeastern Pa - USA
Is there a pulley with a ruff edge ? or excessive play?
I would look into the tensioner pulley. I believe they had a problem with that part of the fan belt area. Dont quite understand play from alternator to crank area ?
I would look into the tensioner pulley. I believe they had a problem with that part of the fan belt area. Dont quite understand play from alternator to crank area ?
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
Ask for a premium belt not just a brand name, they cost more but they stay on the engine a lot better. They also slap a lot less than the cheapies do.
The alternator belt is the one that gives the problem, when it goes it knocks the vacuum pump belt off. That is a bad thing, when it goes, so do the brakes.
The alternator belt is the one that gives the problem, when it goes it knocks the vacuum pump belt off. That is a bad thing, when it goes, so do the brakes.
Logistics Pro
Joined: Apr 2005
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That free play between the v-pump and alternator is normal. It doesn't look like it should be, but check any 6.9 or 7.3 when it's running, they all jump around down there.
V-Belts don't have tensioner pulleys.
V-Belts don't have tensioner pulleys.
New User
Joined: Jun 2003
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the way i fixed mine was used a shorter belt that only goes to water pump not down to the crank pully...threw many belts till i did that...havent had any problems since..been over 1 yr ill look to see belt size if you need it
Elder User
Joined: Aug 2003
Posts: 933
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From: Québec
It is really shaking in this area. It looks like the engineer never looked at it after thinking about this set up. I had a 93 before with the long belt and tensionner, much better. There seem not much to do but I will check the idea of using a shorter belt, like KCKtilt did, interesting...
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