weiand 671 blower belt issue

Old 04-03-2011, 08:03 PM
  #1  
bfar62
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Jun 2010
Posts: 2
Default weiand 671 blower belt issue

we are working on a 1937 chevy truck with a highly modified 350 with a weiand 671 blower. problem is no matter what we do with the idler/ tensioner pulley the belt goes forward on the pulleys until it is stopped by the shoulder of the idler pulley. it acts like if we let it that it would walk all the way off the pulleys,,,,, any ideas what the problem could be ????
bfar62 is offline  
Old 04-03-2011, 08:30 PM
  #2  
TheYellaBrick
Senior Member
RACING JUNKIE
 
TheYellaBrick's Avatar
 
Join Date: Mar 2008
Location: Emmett, Idaho
Posts: 7,334
Default

It's most certainly;y an alignment/squaring issue. All it would take is one pulley just a tad out of square with the others to make it take a walk. If you have an idler pulley with worn bearings(sloppy) it'll tilt enough to make this happen.
TheYellaBrick is offline  
Old 04-04-2011, 08:02 PM
  #3  
bfar62
Junior Member
SHOW GUEST
Thread Starter
 
Join Date: Jun 2010
Posts: 2
Default 671 blower belt issue

we already replaced the bearing just to make sure, same thing still happens
bfar62 is offline  
Old 04-04-2011, 09:07 PM
  #4  
TheYellaBrick
Senior Member
RACING JUNKIE
 
TheYellaBrick's Avatar
 
Join Date: Mar 2008
Location: Emmett, Idaho
Posts: 7,334
Default


Ya might mic the other pulleys for taper.....
Have you changed to a new belt / might be a belt issue...
TheYellaBrick is offline  
Old 07-15-2011, 02:48 PM
  #5  
diverdmt
Junior Member
SHOW GUEST
 
Join Date: Jul 2004
Posts: 1
Default belt walk

I have some leftover parts from a 6-71 I would get rid of if you wanted them. Tom 270-556-5340 [email protected]
diverdmt is offline  
Old 07-15-2011, 07:09 PM
  #6  
TS1955
Senior Member
DYNO OPERATOR
 
Join Date: Aug 2007
Location: Lost Creek, WV
Posts: 533
Default

Ya might check your intake also to make sure it's square. I had one that had a slight taper front to back that caused the same problem. A good machine shop can fix it.

TS1955
TS1955 is offline  
Old 07-19-2011, 08:02 AM
  #7  
oldandtired
Senior Member
RACING JUNKIE
 
oldandtired's Avatar
 
Join Date: Dec 2008
Location: Sugar Hill, GA
Posts: 1,370
Default

Originally Posted by TS1955
Ya might check your intake also to make sure it's square. I had one that had a slight taper front to back that caused the same problem. A good machine shop can fix it.

TS1955
X2 and you may have a head milled with a front to back taper. That would make everything out of line.
oldandtired is offline  
Old 08-05-2012, 12:40 PM
  #8  
kennysmith55
Junior Member
SHOW GUEST
 
Join Date: Aug 2008
Posts: 1
Default Walking Idler pulley ?

Assuming the heads, block, crank,ect are true . The only thing that will make the belt run off is the Idler pulley ! The belt will walk to the tightest side of the pulley . I took the spacer behind the pulley and used a fly cutter to take .030 off . This put a angle on one end of spacer and flat on the other end that goes up againist the inner race of bearing , this will let you change the angle of the idler pulley too make belt true . I'm a machinist , and it took a couple of try's too get it right You will also need to do the same thing to the washer or spacer on the backside of pulley bracket with the same angle you have on the spacer that you just cut ! Unfortantly blower manufactors are not belt people . Like the other guy said bearings must be good or you will never get it right ! Also , turning the belt around , or replacing does not work ,belt will still walk towards the tight end of pulley ! Hope this helps . . . . . YOU CAN EMAIL ME IF YOU NEED MORE INFO !
kennysmith55 is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service