I think the shop trashed my idler pulley - JeepForum.com
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Unread 12-13-2013, 07:29 PM   #1
Gearhead31
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Join Date: Feb 2012
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I think the shop trashed my idler pulley

Out of nowhere, I'm hearing this horrid sound from the engine area.. Sounds like it might be my upper idler, though it's not a sound I've heard from a pulley before, almost like the rattling/vibrating/pulsing sound from someone touching a subwoofer cone while it's pumping bass.. doesn't change with rpm's(same from 800-4,500 rpm) and disappears after 1 minute(almost like clockwork both times), only did it a couple times, once warm engine, once cold. I'm used to the grinding, metal on metal and squealing/squeaking from pulleys and being either continuous or sporadic and brief. I'm hoping it's just that and not my still fairly new alternator or the a/c compressor.
Of course there's been a couple gallons worth of coolant spilled over that whole area from previous thermostat gasket failures so I'm hoping it's that making it pulse(?). Either that or the shop overtightened the belt and trashed it...
*rant time* Why does karma have it out for me lately? A mysterious knocking out of knowhere that doesn't seem to fit any one problem, a possible dying pulley, insanely sporadic and erratic shifting starting in the middle of rush hr freeway traffic, and being sick for holiday parties.. Happy friday the 13th, I guess

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1995 ZJ ltd, 4.0 i6, *cough stock cough* 253,xxx and still pumping strong
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*In peace, sons bury their fathers. In war, fathers bury their sons. - Herodotus
[QUOTE=JasonStebbins]We can call it the Whoosh King Catalog System. :D[/QUOTE]
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Unread 12-14-2013, 08:08 AM   #2
motordoctor
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That sounds like the power steering pump blowing up. At least that's the noise mine made right before it locked solid.....
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Unread 12-14-2013, 08:18 AM   #3
Gearhead31
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Its definitely coming from the left half, which leaves the idler, ac and alternator.
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1995 ZJ ltd, 4.0 i6, *cough stock cough* 253,xxx and still pumping strong
1998 Chevy Cheyenne K1500, 5.7L Vortec, mostly stock
*In peace, sons bury their fathers. In war, fathers bury their sons. - Herodotus
[QUOTE=JasonStebbins]We can call it the Whoosh King Catalog System. :D[/QUOTE]
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Unread 12-14-2013, 08:50 AM   #4
PolkaPower
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You need to get a long dowel rod or screwdriver and listen for where the sound is the loudest. Should take five minutes to find .
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Unread 12-14-2013, 08:54 AM   #5
Gearhead31
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Easier said then done with the fan spinning ;p its not doing it again now so when it crops up again, im planning on it to make sure
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1995 ZJ ltd, 4.0 i6, *cough stock cough* 253,xxx and still pumping strong
1998 Chevy Cheyenne K1500, 5.7L Vortec, mostly stock
*In peace, sons bury their fathers. In war, fathers bury their sons. - Herodotus
[QUOTE=JasonStebbins]We can call it the Whoosh King Catalog System. :D[/QUOTE]
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Unread 12-14-2013, 02:15 PM   #6
Oldfrog
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That pulley near the air unit is $24 or less. Just buy one and keep it as a spare if that isnt the issue. You'll need it eventually.
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Unread 12-14-2013, 04:04 PM   #7
zjosh93
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I just replaced both of my pulleys on my 93 for $7 each on Rockauto. If $7 is too much most auto parts places have just the bearing for a couple bucks less.
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Unread 12-15-2013, 08:38 AM   #8
Gearhead31
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For the bearing replacement, you need to separate the pulley from the bearings with a press, correct? If so, i'd rather just spend the money and get the whole thing replaced.
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1995 ZJ ltd, 4.0 i6, *cough stock cough* 253,xxx and still pumping strong
1998 Chevy Cheyenne K1500, 5.7L Vortec, mostly stock
*In peace, sons bury their fathers. In war, fathers bury their sons. - Herodotus
[QUOTE=JasonStebbins]We can call it the Whoosh King Catalog System. :D[/QUOTE]
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Unread 12-15-2013, 08:41 AM   #9
zjosh93
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The amount of interference fit between the bearing and pulley is pretty moderate. You can replace them with a vice or a big C-clamp. The thin sheet metal of the pulley can't really support much crush anyway.
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Unread 12-15-2013, 09:00 AM   #10
Gearhead31
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Noted, thank you! I'll look around here, see how prices run. Probably going to replace the whole thing and use that as an emergency spare or something
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1995 ZJ ltd, 4.0 i6, *cough stock cough* 253,xxx and still pumping strong
1998 Chevy Cheyenne K1500, 5.7L Vortec, mostly stock
*In peace, sons bury their fathers. In war, fathers bury their sons. - Herodotus
[QUOTE=JasonStebbins]We can call it the Whoosh King Catalog System. :D[/QUOTE]
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Unread 12-25-2013, 08:36 PM   #11
Gearhead31
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picked up a mechanic's stethascope and am still waiting for it to come back so I can zero in exactly which bugger was giving me grief. I sprayed a little bit of WD40 on that idler and it's yet to come back. I think it might have just been that, probably from having a huge amount of coolant purged onto it, both with engine off/cold and hot/running. I'll go ahead and pick up another pully soon because it will eventually go. I might as well have that on hand for the long trips to come!
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1995 ZJ ltd, 4.0 i6, *cough stock cough* 253,xxx and still pumping strong
1998 Chevy Cheyenne K1500, 5.7L Vortec, mostly stock
*In peace, sons bury their fathers. In war, fathers bury their sons. - Herodotus
[QUOTE=JasonStebbins]We can call it the Whoosh King Catalog System. :D[/QUOTE]
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Unread 12-25-2013, 08:50 PM   #12
zjosh93
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Checked it out and the correct bearing should be a 6203-2rs which is a very common automotive bearing. The front bearing in our power steering pumps is the same and a lot of alternators use that bearing. There are some on Amazon for about $2 but you might find them locally. I pressed out the two in my pair of bad pulleys using my bench vise and a socket pretty easily.
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Unread 12-25-2013, 10:46 PM   #13
Gearhead31
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Quote:
Originally Posted by zjosh93 View Post
Checked it out and the correct bearing should be a 6203-2rs which is a very common automotive bearing. The front bearing in our power steering pumps is the same and a lot of alternators use that bearing. There are some on Amazon for about $2 but you might find them locally. I pressed out the two in my pair of bad pulleys using my bench vise and a socket pretty easily.
Thank ya. I'm probably just going to get a full idler pulley instead of just the bearing, be sure that all of it is good. Sure I could save some money but I figure it is money well invested in this case
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1995 ZJ ltd, 4.0 i6, *cough stock cough* 253,xxx and still pumping strong
1998 Chevy Cheyenne K1500, 5.7L Vortec, mostly stock
*In peace, sons bury their fathers. In war, fathers bury their sons. - Herodotus
[QUOTE=JasonStebbins]We can call it the Whoosh King Catalog System. :D[/QUOTE]
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Unread 12-26-2013, 03:47 PM   #14
zjosh93
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Yeah I figured, I just wanted to close my advice in case someone else finds this thread in the future.
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Unread 12-26-2013, 04:09 PM   #15
Gearhead31
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Gotcha
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1995 ZJ ltd, 4.0 i6, *cough stock cough* 253,xxx and still pumping strong
1998 Chevy Cheyenne K1500, 5.7L Vortec, mostly stock
*In peace, sons bury their fathers. In war, fathers bury their sons. - Herodotus
[QUOTE=JasonStebbins]We can call it the Whoosh King Catalog System. :D[/QUOTE]
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