Engine 2000 GT 4.6 V8 Noise coming from Pulleys... how to (pic attached)

Sams2000GT

Member
May 8, 2002
41
0
6
Michigan - Around Detroit
Hi guys,

My engine (123K miles) has had a small whine over the last few months, nothing too bad but definitely noticeable. It was more prevalent during cold winter days. Last week I was driving it and the noise started to get a lot worse to the point where I heard a metal on metal scraping noise. I immediately pulled over and checked the engine. I narrowed it down to a bad pulley. I drove it back home and it has been in the garage since.

Once home, I released tension on the belt using a ratchet on the belt tensioner and spun all the pulleys. The two pulleys that make noise are the two circled in red on the attached image.

The bottom one is really loose and make a lot of noise when spun while the one on the top is noisy but nothing like the lower one.

Are these both referred to as the idler pulleys? I did some research and came up with Motorcraft Part #'s YS249 (lower ribbed pulley) and YS245 (smooth upper pulley). Should they be replaced with Motorcraft or is there a better brand out there?

Lastly, is this an easy repair? The smooth upper idler pulley looks very easy to replace. The ribbed lower pulley looks more difficult (it has a AC line dryer in front of it) and I have researched this problem and have seen people mention that this one is reverse threaded. What exactly does that mean?

I am not super technical but I have done some repairs to the car. Does this require a mechanic or is this something pretty easy to get done?

Thanks in advance for your help!

P.S. attached image isn't my car, just found it on the web and put circles on the problem areas.
 

Attachments

  • Sponsors(?)


Sams2000GT

Member
May 8, 2002
41
0
6
Michigan - Around Detroit
Thanks for the reply trinity_gt. Are either of these reversed threaded? And do I have to worry about the correct torque applied? I don't have a torque wrench. Also before I remove the belt is there a belt diagram better than the one on the underside of the hood?

Hopefully it isn't too much of an issue to replace these. I am just hoping that the lower idler pulley isn't an issue with that AC filter dryer in the way.
 

trinity_gt

10 Year Member
Jan 31, 2003
3,125
80
99
Canada
Thanks for the reply trinity_gt. Are either of these reversed threaded? And do I have to worry about the correct torque applied? I don't have a torque wrench. Also before I remove the belt is there a belt diagram better than the one on the underside of the hood?

Hopefully it isn't too much of an issue to replace these. I am just hoping that the lower idler pulley isn't an issue with that AC filter dryer in the way.
a) No, neither is left-hand thread.
b) Torque isn't critical. Just do them "goodntight." Go back and check them after a hundred miles if you're worried. It's about 18 ft-lbs so think how you'd tighten a spark plug and just do that.
c) You can use this for reference:
2008-04-01_211455_Mustang_Belt_routing.gif

d) The nut holding the bracket for the dryer can be remove and the dryer bent slightly out of the way for clearance without issue.
 

Attachments

Sams2000GT

Member
May 8, 2002
41
0
6
Michigan - Around Detroit
a) No, neither is left-hand thread.
b) Torque isn't critical. Just do them "goodntight." Go back and check them after a hundred miles if you're worried. It's about 18 ft-lbs so think how you'd tighten a spark plug and just do that.
c) You can use this for reference:
2008-04-01_211455_Mustang_Belt_routing.gif

d) The nut holding the bracket for the dryer can be remove and the dryer bent slightly out of the way for clearance without issue.
Thanks again trinity_gt for all your help! Replaced both pulleys today and the car sounds much better. Everything is working as expected.
 

Attachments

JJ Glo

New Member
Mar 27, 2013
5
0
1
28
My car was making a loud screeching noise caused by the belt/belt tensioner.

The old tensioner for some reason was making the belt move out of place and the belt was hitting the engine and rubbing against it. I put in a new tensioner and changed the smooth idler pulley above it also and it runs fine without the noise anymore.
 
Thread starter Similar threads Forum Replies Date
B 2000 V6 Mustang knocking sound 1996 - 2004 SN95 Mustang -General/Talk- 0
C 2000 v6 - grinding noise SN95 V6 Mustang Tech 2
B 2000 Gt Engine Noise! SN95 4.6L Mustang Tech 5
0 Exhaust 2000 Gt Rattle SN95 4.6L Mustang Tech 0
J My 2000 Mustang Gt Grining Noise??? 1996 - 2004 SN95 Mustang -General/Talk- 5
BoonMcabee 2000 3.8 Power Steering Noise? 1996 - 2004 SN95 Mustang -General/Talk- 4
Pruittracing Help 4.6 Engine Tick SN95 4.6L Mustang Tech 8
0 Please Help! 1996 - 2004 SN95 Mustang -General/Talk- 2
jayrw 2000 Mustang Gt - Wheel Bearing Noise Up Front, Can't Figure Out Which Side. SN95 4.6L Mustang Tech 24
quique 2000 Raddle noise SN95 V6 Mustang Tech 0
ky_kneedragger 2000 gt engine noise SN95 4.6L Mustang Tech 6
B Grinding Noise 2000 Mustang GT SN95 4.6L Mustang Tech 7
V 2000 GT Coupe Wind Noise HELP! SN95 4.6L Mustang Tech 4
9 For Sale For Sale - 1996 Mystic - #1985/2000 SN95 Mustangs For Sale (1994-04) 0
F 2000 V/6 Convert DEAD! SN95 V6 Mustang Tech 5
H 2000 mustang gt should I supercharge 1996 - 2004 SN95 Mustang -General/Talk- 4
G 2000 gt 4.6L generator not charging 1996 - 2004 SN95 Mustang -General/Talk- 1
R New member 2000 Mustang,looking for guidance. The Welcome Wagon 3
M For Sale FS: 2000 Mustang GT Track Car / 62k Miles / 5k on Motor / Full Roll Cage / California / $5,000 OBO SN95 Mustangs For Sale (1994-04) 0
V Digital Tuning 2000 V-6 Convertible automatic SN95 V6 Mustang Tech 4
S 2000 3.8l lower intake 1996 - 2004 SN95 Mustang -General/Talk- 0
R For Sale 2000 Mustang Turbo 6 speed SN95 Mustangs For Sale (1994-04) 1
F 2000 Mustang V/6 Standard Amp 1996 - 2004 SN95 Mustang -General/Talk- 3
T_Roberts Radiator Hoses and Pulleys on a 2000 v6 Mustang 1996 - 2004 SN95 Mustang -General/Talk- 0
Kylor Need help pricing 2000 Roush Stage 2 What is it Worth?!?!? 12
J 2000 GT Idle/Running Issues SN95 4.6L Mustang Tech 6
M WTB/Trade Looking for 2000-2004 Salvage GT SN95 Mustangs For Sale (1994-04) 0
Misti 2000 Ford Mustang GT 4.6 - Rear Differential 1996 - 2004 SN95 Mustang -General/Talk- 12
M 2000 S281SC 1996 - 2004 SN95 Mustang -General/Talk- 0
79pace 2000 GT Strong exhaust smell possibly really rich but no codes 1996 - 2004 SN95 Mustang -General/Talk- 4
F 2000 gt say for 7 years won’t start 1996 - 2004 SN95 Mustang -General/Talk- 3
ryansgts 2000 gt e85 conversion? 1996 - 2004 SN95 Mustang -General/Talk- 0
N Fuel issue 2000 v6 SN95 V6 Mustang Tech 2
P For Sale PAXTON NOVI 2000 SUPERCHARGER KIT WITH 10 RIB RENEGADE BRACKET & ANDERSON POWER PIPE / FILTER Engine and Power Adder 4
P For Sale PAXTON NOVI 2000 SUPERCHARGER KIT WITH 10 RIB RENEGADE BRACKET & ANDERSON POWER PIPE / FILTER Engine and Power Adder 0
2 2000 gt engine ID sticker help 1996 - 2004 SN95 Mustang -General/Talk- 2
Misti 2000 Ford Mustang Gt 4.6 - Waterpump 1996 - 2004 SN95 Mustang -General/Talk- 4
W Engine 2000 ford mustang gt SN95 4.6L Mustang Tech 2
Misti 2000 Ford Mustang Gt 4.6 1996 - 2004 SN95 Mustang -General/Talk- 2
L 2000 GT Head Gasket - Leaking Coolant; mileage = 71,000ish 1996 - 2004 SN95 Mustang -General/Talk- 1
nathanruschill 2000 Mustang Gt auto starting issue!! SN95 4.6L Mustang Tech 3
S 2000 Mustang V6 wont start SN95 V6 Mustang Tech 1
C 2000 shell but insides are all 1995 gt....need help 1994 - 1995 Specific Tech 4
S Looking for all things great! 2000 Mustang Gt (Raush w/o the supercharger) for now. SN95 4.6L Mustang Tech 0
T Electrical 2000 3.8 weird ignition issue SN95 V6 Mustang Tech 2
F What in the world? What differential do I have. 2000 Saleen S-281 SC 1996 - 2004 SN95 Mustang -General/Talk- 0
S 2000 Mustang GT surging idle/cruising SN95 4.6L Mustang Tech 3
Brads2000 Need help, 2000 3.8 sputtering The Welcome Wagon 3
S Engine 2000 3.8 Engine Swap to 94 SC! SN95 V6 Mustang Tech 5
C Gauges on 2000 gt slow to work after starting 1996 - 2004 SN95 Mustang -General/Talk- 6
Similar threads