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  • SN95 4.6L Mustang Tech

Belt Tensioner moves back and forth every minute or so?

  • Thread starter Thread starter Tom Wagner
  • Start date Start date Oct 25, 2009
T

Tom Wagner

Member
Jan 9, 2002
54
0
6
Racine, WI
Oct 25, 2009
#1
  • Oct 25, 2009
  • #1
Hi, On my 2001 GT the stock tensioner was jerking back and forth every minte or so, So I replaced the belt tensioner, idler pully and the belt. The new one does the same thing. Is this normal or is something else causing this. Thanks for any help.
 
R

ran260gt

New Member
Sep 7, 2005
365
0
0
Oct 25, 2009
#2
  • Oct 25, 2009
  • #2
Tom Wagner said:
Hi, On my 2001 GT the stock tensioner was jerking back and forth every minte or so, So I replaced the belt tensioner, idler pully and the belt. The new one does the same thing. Is this normal or is something else causing this. Thanks for any help.
Click to expand...

Is your A/C on when its doing this ?
 
B

bdcardinal

tree hugger
Jun 10, 2003
3,612
16
69
santa barbara, CA
Oct 25, 2009
#3
  • Oct 25, 2009
  • #3
ran260gt said:
Is your A/C on when its doing this ?
Click to expand...

+1
 
S

Seraphim38

New Member
Oct 13, 2008
14
0
0
Woodinville
Oct 25, 2009
#4
  • Oct 25, 2009
  • #4
Thump RRR Racing now is selling a billet version that fits your car...I have the 3 bolt version for mine and now have no belt slippage...



I also did change the pulley size to a larger one, since they are relatively universal, and it helped add tension by changing the position of the tensioner arm...
 
T

Tom Wagner

Member
Jan 9, 2002
54
0
6
Racine, WI
Oct 25, 2009
#5
  • Oct 25, 2009
  • #5
Thanks, it was on defrost and went away when switched to vent. Normal??
 

trinity_gt

10 Year Member
Jan 31, 2003
3,125
81
99
Canada
Oct 25, 2009
#6
  • Oct 25, 2009
  • #6
Tom Wagner said:
Thanks, it was on defrost and went away when switched to vent. Normal??
Click to expand...

Yes. On defrost the AC is engaged to dehumidify the air before blasting it on the windshield (drier air will help pull moisture off the windshield.) The clutch on the AC compressor cycles, on and off, as the system pressures dictate. When the clutch engages, a fairly significant load is put on the belt momentarily -- to get the compressor turning -- causing the tensioner to "kick."
 
T

Tom Wagner

Member
Jan 9, 2002
54
0
6
Racine, WI
Oct 25, 2009
#7
  • Oct 25, 2009
  • #7
Thanks Trinity GT, that explains it. Thanks everyone for the help
 
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