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Unread 10-12-2009, 11:57 AM   #1
jeepjunkie408
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water pump part

I tried to search around.. but Im still stumped, if someone could help me out, I want to replace the metal arm that is attached to the water pump. What is it even called?

sorry, thanks so much...

ps. it's for a 2000 xj

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Unread 10-12-2009, 01:46 PM   #2
DC4W-93XJ
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for the heater hose???
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Unread 10-12-2009, 02:47 PM   #3
multmigs
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I was thinking the same thing on mine, as I needed to do a water pump change on mine, but I took the pump off, the arm thing unscrewed no problem from it and then I hit it with a wire wheel for a few minutes and some spray bomb and it looks almost new...
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Unread 10-12-2009, 03:47 PM   #4
mhall02
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Are you all taking about the water pump inlet tube that screws into the water pump? You can get it at rockauto.com for $7.64 before shipping (Dorman Part No. 56398). That is where I got mine, my original had paint peeling off and looked pretty rusty, so when I did my pump I ordered the Gates heater core hoses and and inlet tube off rockauto and got the water pump and thermostat from Advance. Thought I would just replace it all since it was nearly 10 years old and I was there anyway.
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Unread 10-12-2009, 06:57 PM   #5
Mickey_D
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I'm about to do my water pump on my 1990 and am wondering WTH you guys are talking about. Anyone got a pic of this "arm"?
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Unread 10-12-2009, 09:03 PM   #6
mhall02
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What I'm talking about looks Like this:

Amazon.com: Dorman 56398 Water Pump Inlet Tube: Automotive
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Unread 10-12-2009, 11:10 PM   #7
jeepjunkie408
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thanks guys! I was going that arm thing is exactly what part I was talking about!

I ended up calling the dealer and seeing if they had it, they were going to have to order it and it was going to be a week or so before it came in, so I decided to just paint mine... after I wade through the rust.. there was virtually NO paint on it and it's all rust.. but it seems pretty sturdy so I will just make due with it.
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Unread 10-12-2009, 11:58 PM   #8
5-90
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That is the feed for the heater core.

However, I don't suggest getting an "OEM Replacement" part - it's thin-gage mild steel. Fortunately, the threads are standard - 3/8" NPT.

1) Get a 3/8"x whatever brass pipe nipple at your local hardware store. 4-6" should serve. Cut off one end just beyond the threads and debur. Screw into water pump housing, apply some RTV black on the outside of the cut end, and slip the hose on (1/2" hose fits neatly over 3/8" pipe.) Allow at least 1-1/2" of overlap, put one clamp at least 1/4" from the bitter end of the hose, and the other should fit fully on the pipe with 1/4" between clamp bands.

2) I don't recall the length, but you can use a longer nipple (8-10"?) an elbow, and a shorter nipple (cut the threads off of one end) and eliminate the right-angle moulded hose - which saves you a few bucks on service. Use brass. Why brass? It won't corrode anywhere near as badly on you.

3) Not for the faint of heart, but you can go "whole hawg" and eliminate most of the heater hoses from the outset - I did this. I know it can be done on RENIX, and it can probably be done on 1991-up rigs as well.

NB: I added a hose bibb on a T fitting (for backflushing) and a shutoff valve (to force reverse flow when backflushing.) You need do neither - but at least the hose bibb isn't a bad idea. It allows me to screw my garden hose directly to the thing, I have a 3/4" hose bibb gender changer attached to a shutoff valve in my toolbox for this use.

Sorry about the big pic, but it should get the design across. I don't have any notes on measurement, and I do plan to revise them anyhow.

Construction is 1/2" copper line and fittings, sweat-soldered together. 1/2" copper line also fits neatly into 5/8" heater hose, although the two ends with 3/4" hose will fit better onto 1/2" copper tube unions instead of the line proper. Same rules for attaching the hose stubs (for vibration) - allow at least 1-1/2" overfit, 1/4" between the bitter (cut) end of hose and the clamp band, 1/4" between clamp bands, and full seating of both clamps over metal tubing. Apply RTV black on outside of tubing before installing hose (a small bead will serve - it helps the seal, and keeps the hose from getting stuck on too badly.)

The extra caution in sealing is done because the copper tube (or brass pipe stubs) are not beaded to accept a hose, and the hose therefore needs a little extra help to seal.

Good luck! I did the setup pictured in something like a half-hour, but I'm used to working with copper and heat. Most people who are figuring it out on the fly would take 60-90 minutes, I think.

Make sure to debur all cut ends before assembling, particularly where rubber hose goes over metal line!
cuhtrhse.jpg  
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Unread 10-13-2009, 07:15 AM   #9
mhall02
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That setup will outlast your Jeep!! I've never in my life seen copper pipe used in lieu of rubber hoses on a vehicle.
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Unread 10-13-2009, 09:52 PM   #10
jeepjunkie408
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yeah, kudos to the hard work!
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Unread 10-13-2009, 10:49 PM   #11
5-90
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Quote:
Originally Posted by mhall02 View Post
That setup will outlast your Jeep!! I've never in my life seen copper pipe used in lieu of rubber hoses on a vehicle.
Thanks - although it really wasn't that hard. I just got tired of buying all of those damned right-angle-moulded rubber hoses for $15-20 a pop.

I need to refine the measurements, and attack that funky elbow into the bottom of the football, and it will be good.
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Unread 10-13-2009, 10:50 PM   #12
BrunoS
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i'm sitting in awe of the plumbing work. dude, awesome. it will outlive all of us!
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