Replace big block water pump idler pulley - how?
#1487106
08/19/13 10:35 PM
08/19/13 10:35 PM
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Joined: Jan 2003
Posts: 395 Knoxville, TN, USA
mantonas
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I want to replace the water pump idler pulley on my big block because the bearings feel worn out. I bought a replacement from O'Reilly Auto Parts. When I looked up the part originally it was a Murray 45900 as shown on this link: http://www.oreillyauto.com/site/c/detail...7&ppt=C0331But when I called to find out if they had it in stock, they told me it cross-referenced to a Gates 38038. So I bought it, and it looks like it might fit. But the old pulley has a threaded stud in it that I don't know how to remove, or even if it's removable. I tried tapping it out with a hammer but it didn't budge. Has anyone tried to replace one of these? Is it even removable? If it is, how do you get it out? See the attached pictures.
69 Chrysler 300 Convertible
77 Chrysler New Yorker Brougham 2-dr
03 Jeep Grand Cherokee Limited
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Re: Replace big block water pump idler pulley - how?
[Re: mantonas]
#1487108
08/19/13 10:39 PM
08/19/13 10:39 PM
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Joined: Jan 2003
Posts: 395 Knoxville, TN, USA
mantonas
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Front of old and new pulleys
69 Chrysler 300 Convertible
77 Chrysler New Yorker Brougham 2-dr
03 Jeep Grand Cherokee Limited
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Re: Replace big block water pump idler pulley - how?
[Re: mantonas]
#1487109
08/19/13 10:40 PM
08/19/13 10:40 PM
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Joined: Jan 2003
Posts: 395 Knoxville, TN, USA
mantonas
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Back of old and new pulleys
69 Chrysler 300 Convertible
77 Chrysler New Yorker Brougham 2-dr
03 Jeep Grand Cherokee Limited
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Re: Replace big block water pump idler pulley - how?
[Re: JohnRR]
#1487111
08/20/13 06:57 AM
08/20/13 06:57 AM
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Joined: Jan 2003
Posts: 1,567 Ky
jt4406
pro stock
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pro stock
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Ky
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JohnRR is right. The cover is welded in multiple places around the front of the pulley (that cover is visible when installed on the engine). I cut mine off thinking I could just replace the bearing. However after getting the cover off and the stud out (which you will also have to do), I discovered that the cover also serves to hold the bearing in the pulley. It is not a press fit and you would have to weld a cover back on to be able to use the original pulley.
jess
Yeah, it's hopped up to over 160...
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Re: Replace big block water pump idler pulley - how?
[Re: jt4406]
#1487112
08/20/13 07:33 AM
08/20/13 07:33 AM
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Joined: Jan 2003
Posts: 395 Knoxville, TN, USA
mantonas
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Thanks for the info, I did not notice the weld.
It seems like the real irreplaceable part is the stud with the flat side to line up with the "D" shaped hole in the bracket. If you cut off the original pulley front cover and remove the stud, will it fit into the replacement pulley? Is it a shoulder bolt that press fits into the pulley and if so is it the right diameter?
69 Chrysler 300 Convertible
77 Chrysler New Yorker Brougham 2-dr
03 Jeep Grand Cherokee Limited
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Re: Replace big block water pump idler pulley - how?
[Re: jt4406]
#1487115
08/20/13 01:56 PM
08/20/13 01:56 PM
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Joined: Jan 2003
Posts: 21,080 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,080
Niles , Ohio
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Most JY cars have idlers that have a large washer that was between the bolt and pulley.Then you just need the correct thread bolt.Rocky
Chrysler Firepower
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Re: Replace big block water pump idler pulley - how?
[Re: therocks]
#1487116
08/21/13 08:37 PM
08/21/13 08:37 PM
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Joined: Jan 2003
Posts: 395 Knoxville, TN, USA
mantonas
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I know what a YJ car is (Jeep Wrangler), but what is a JY car?
69 Chrysler 300 Convertible
77 Chrysler New Yorker Brougham 2-dr
03 Jeep Grand Cherokee Limited
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Re: Replace big block water pump idler pulley - how?
[Re: mantonas]
#1487118
08/21/13 08:55 PM
08/21/13 08:55 PM
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Joined: Jul 2004
Posts: 3,816 Arlington, Texas
bobby66
master
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master
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Arlington, Texas
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Quote:
I know what a YJ car is (Jeep Wrangler), but what is a JY car?
JY=Junk Yard.
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Re: Replace big block water pump idler pulley - how?
[Re: bobby66]
#1487119
08/21/13 09:20 PM
08/21/13 09:20 PM
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Joined: Jan 2003
Posts: 395 Knoxville, TN, USA
mantonas
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I guess all cars are eventually JY cars.
69 Chrysler 300 Convertible
77 Chrysler New Yorker Brougham 2-dr
03 Jeep Grand Cherokee Limited
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Re: Replace big block water pump idler pulley - how?
[Re: 1MYTGTX]
#1487120
08/22/13 01:36 AM
08/22/13 01:36 AM
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Joined: Jan 2008
Posts: 553 DE
Ply72rr
mopar
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mopar
Joined: Jan 2008
Posts: 553
DE
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Quote:
Quote:
Mega Parts carries a very nice reproduction of these pulleys!!
Link??
Mega Parts Pulley
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