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- From: dmu5391@hertz.njit.edu (David M. Utidjian Esc stnt)
- Newsgroups: rec.autos.tech
- Subject: Re: Fan belt falls off
- Message-ID: <1993Jan21.161607.16836@njitgw.njit.edu>
- Date: 21 Jan 93 16:16:07 GMT
- References: <93Jan19.114356pst.11900@alpha.xerox.com>
- Sender: news@njit.edu
- Organization: New Jersey Institute of Technology, Newark, N.J.
- Lines: 39
- Nntp-Posting-Host: hertz.njit.edu
-
- In article <93Jan19.114356pst.11900@alpha.xerox.com> Michel_Denber.WBST147@xerox.com writes:
- >
- > "Is the belt possibly coming off because the idler pulley doesn't have
- >enough tension?"
- >
- >Hmm, never heard of a serpentine belt flying off before. Assuming all the
- >pulleys are aligned and not wobbling, it seems like it must just be too loose,
- >Lautrec. The tensioner should apply a fair amount of pressure to it, not just
- >taking up slack. How many miles do you have? Maybe the belt stretched beyond
- >the ability of the tensioner to compensate.
- >
- In my experience the most common reason for a serpentine belt
- to be "thrown" is improper alignment of pulleys.
-
- All of the pulleys MUST have their center groove (or some other
- reference) lie in the same plane all of the time AND all of the axes of
- the pulleys MUST be normal (at right angles) to this plane.
-
- MAke sure you have correct tension on the belt... some idlers are
- spring loaded to start the tension then the idler is locked in position.
- Crank the engines a couple of times and recheck the tension.
-
- Also check the endplay on each of the pulleys.
-
- >While we're at it, the serpentine belt on my 2.8L V-6 has started to show lots
- >of little cracks between the grooves on the inside of the belt. This is the
- >first car I've had with one of these. The outer surface looks fine - no
- >fraying, glazing, or softening. Does anyone have a number for how long
- >serpentine belts typically last? I've got 52K miles on this one.
- >
- Typical replacement intervals are 30,40,50,60K miles....
- Many service manuals recommend replacement as soon as there is noticeable
- deterioration of the belt. Small cracks on the innner groove surface of
- the belt is noticeable deterioration... so replace it.
-
- > - Michel
-
- David Utidjian
- utidjian@remarque.berkeley.edu
-