please help car keeps throwing serpitine belt
Thread Starter
Teching In
Joined: Jan 2002
Posts: 10
Likes: 0
From: baltimore md
please help car keeps throwing serpitine belt I have a 2001 with heads and cam.I had a vig 2800 in it and i never had a problem with the belt but since i put the 3600 in there when you stomp it the belt rides off the idler pulley and came off on me last night. Thank alot for your help.
Re: please help car keeps throwing serpitine belt Give ASP a call. I had a group purchase on high flanged tensioner pulleys some time back that eliminated the problem. You will have to pay a little more but it will solve your problem.
Re: please help car keeps throwing serpitine belt If you're riding off the tensioner then
either it, or one of your pulleys (most
likely the one that feeds it) is offset
from the belt plane. I just got done
with a second alternator swap on a car
that was chewing its belt up (not GM).
The replacement alternator had a pulley
that was 1/8" further stickout. There
are different alternator shaft collar
shims that you can use to set depth, but
the rebuilders only use one standard one.
On our cars the crank pulley feeds the
tensioner. Seems not coincidental that
your new crank pulley precedes belt throwing.
Look for both offset and for runout (anything
making the tensioner "bounce" gives opportunity
to skip a groove).
A high-lip tensioner will help keep things
together, but you don't want to see a lot
of edge scrub going on. If you see anything
odd at the crank pulley, then fix it at the
source is my recommendation. Do they have any
alignment shims to use in setting crank pulley
depth relative to belt plane?
either it, or one of your pulleys (most
likely the one that feeds it) is offset
from the belt plane. I just got done
with a second alternator swap on a car
that was chewing its belt up (not GM).
The replacement alternator had a pulley
that was 1/8" further stickout. There
are different alternator shaft collar
shims that you can use to set depth, but
the rebuilders only use one standard one.
On our cars the crank pulley feeds the
tensioner. Seems not coincidental that
your new crank pulley precedes belt throwing.
Look for both offset and for runout (anything
making the tensioner "bounce" gives opportunity
to skip a groove).
A high-lip tensioner will help keep things
together, but you don't want to see a lot
of edge scrub going on. If you see anything
odd at the crank pulley, then fix it at the
source is my recommendation. Do they have any
alignment shims to use in setting crank pulley
depth relative to belt plane?
TECH Resident
Joined: Nov 2001
Posts: 770
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From: the third rock from the sun!
Re: please help car keeps throwing serpitine belt I had this problem on a Formula. One of the tensioners was sticking when I would get on it and allowing enough slack to let the belt walk off the pulley.
Try putting a belt back on with no tools at 1am in a dark parking lot with 5* temps and -20* windchill. BrrrRRRRRRRrrrr c-c-c-c-CooOOLD! <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
Try putting a belt back on with no tools at 1am in a dark parking lot with 5* temps and -20* windchill. BrrrRRRRRRRrrrr c-c-c-c-CooOOLD! <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
TECH Enthusiast
Joined: Nov 2001
Posts: 688
Likes: 2
From: Derby, KS
Re: please help car keeps throwing serpitine belt Get the pulley Larry talked about. I had same problem as you, 12k miles later and many passes on new tensioner pulley, haven't had a belt walk once.
TECH Fanatic
Joined: Jan 2002
Posts: 1,376
Likes: 0
From: Stuart Fl
Re: please help car keeps throwing serpitine belt Mine was doing the same thing at high RPMs.Mostly at the track. I replaced the upper tensioner ($70.00 retail from dealer) and have had no problems since!! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
