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Unread 08-21-2014, 11:26 AM   #1
Tuffy1
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1987 YJ Wrangler 
 
Join Date: Oct 2011
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4.2-258ci correct water pump rotation?

Hello all,

Trying to diagnose a running hot while on highway condition. The last item is the water pump. What is supposed to be the correct water pump rotation for a 4.2 258ci I-6? I have a 4.0 head and MPFI on my 258, don't think that matters?

Please tell me, is it standard rotation? What is standard rotation- clockwise or counter-clockwise, how does one determine what pump it should be? If anyone would happen to have a picture of the correct pump that would help. I am really having trouble with my Napa trying to get the right pump. Please help!!

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Unread 08-21-2014, 12:44 PM   #2
Old4X
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There is no standard rotation, it could be either depending on what belt system you have. V belt goes opposite of serp belt as far as rotation.

Your engine could have come either way.
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Unread 08-21-2014, 01:05 PM   #3
Mike Romain
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V-belt is standard rotation, serpentine belt is reverse rotation.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 08-21-2014, 01:48 PM   #4
bpounds
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Safest bet is to take the old pump with you to Napa. The pump impeller will be a dead giveaway.
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Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1, 5 Speed Peugeot, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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Unread 08-21-2014, 01:56 PM   #5
Mike Romain
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Quote:
Originally Posted by bpounds View Post
Safest bet is to take the old pump with you to Napa. The pump impeller will be a dead giveaway.
I will second that big time. There have been a lot of posts on a couple forums of the wrong pump being in the right box lately. Someone packing them has no clue.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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Unread 08-21-2014, 03:22 PM   #6
Old4X
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Quote:
Originally Posted by Mike Romain View Post
V-belt is standard rotation, serpentine belt is reverse rotation.

And they were sold both ways.
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