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7/8" Heater Hose Nipple on Water Pump? |
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Scrappy
AMC Nut Joined: Jun/26/2019 Location: Alpharetta, GA Status: Offline Points: 255 |
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Posted: Jun/02/2023 at 7:28pm |
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So, I'm trying to get the Spirit running for Hot Rod Power Tour and was almost complete on getting the 401 buttoned up so I could fill the cooling system, but couldn't get the heater hose onto the water pump nipple. The heater core outlet is 3/4" and the hose that was on there (which I had to cut off because it wouldn't budge) was 3/4", so I'd bought 3/4" hose to replace it. I had to resort to pulling the alternator and that side of the Bulltear serpentine setup to get adequate access, only to discover that the nipple is ~7/8". It looks as if 7/8" heater hose is available, but I'm not coming up with any barb reducers, and even McMaster-Carr doesn't show 7/8" barb fittings. What gives? Any suggestions? Thanks, Scrappy |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881 |
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Are you referring to these:
? I use a Wirsbow plumbing tool to expand the 3/4" heater hose with a little silicone grease. Have the tool already from previous work so it does double duty. Example: Know any plumbers? |
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Scrappy
AMC Nut Joined: Jun/26/2019 Location: Alpharetta, GA Status: Offline Points: 255 |
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Nope, I'm not referring to a clamp. I'm referring to a metal barb fitting that you'd fit a hose onto, such as: https://www.mcmaster.com/products/hose-fittings/metal-barbed-hose-fittings-for-air-and-water/
I do know some, but am reluctant to stretch out the hose. Obviously, one was stretched to fit, but I fear a failure where replacing it would be a major PITA.
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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3313 |
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Is this an aftermarket water pump? You won’t have an issue with a rebuilt original casting, but I’ve noticed that the aftermarket water pumps have oversized nipples (insert joke here). Same thing with the aftermarket thermostat housings - apparently when they were designed no one bothered to measure an original or they were never intended to be used with hoses installed. Either that or the casting molds have worn and everything’s grown.
Edited by sweatlock - Jun/02/2023 at 8:12pm |
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Scrappy
AMC Nut Joined: Jun/26/2019 Location: Alpharetta, GA Status: Offline Points: 255 |
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I have no idea. It was installed years ago by someone else and that person can't be asked, but knowing him, it was likely from NAPA. I can tell with certainty that it ain't an Edelbrock. If it were, I wouldn't be dealing with the issue, I'd just change the nipple.
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THE MENACE
AMC Addicted Joined: Nov/04/2008 Location: So. California Status: Offline Points: 4438 |
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Mopar/Jeep hose #J576 5301 is a 3/4" hose with one end molded 7/8" for the water pump. Dennis |
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Former Owner of:
The Craig Breedlove "AERO AMX" Still Owner: SS/AMX #9 replica (THE BIG MENACE) 70 AMX 416, EFI, Nash 5 speed 70 Javelin 401, 727 (Wife's car) 72 Gremlin Autocross Project. |
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Scrappy
AMC Nut Joined: Jun/26/2019 Location: Alpharetta, GA Status: Offline Points: 255 |
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Wow, that info is just the ticket! In case I run into a parts guy/gal who can't look it up that way, do you know the application so they can look it up by year/model/engine?
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pit crew
Supporter of TheAMCForum Joined: Jul/08/2007 Location: delete Status: Offline Points: 5341 |
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73 Hornet - 401EFI - THM400 - Twin Grip 20 |
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Scrappy
AMC Nut Joined: Jun/26/2019 Location: Alpharetta, GA Status: Offline Points: 255 |
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Thanks!
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JohnRyd
Supporter of TheAMCForum Joined: Aug/18/2013 Location: Newark, DE Status: Offline Points: 336 |
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If you have no luck getting the Jeep hose you may want to consider a short 7/8 x 3/4 reducer hose, then a 3/4 hose splicing nipple connecting the 3/4 end of the reducer to a length of 3/4 heater hose going to the heater core. Or you could put the smaller end on the heater core, use a 7/8 splicing nipple and run 7/8 hose to the pump.
If you search for 7/8 x 3/4 hose a few reducers come up. They are typically about 6 inches long. If you search 7/8 x 3/4 heater hose, several molded heater hoses for other applications come up. Most are short and have several bends. You would probably need to cut it to get the section that works. If you search 3/4 splicing nipple several of those come up. |
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Adolph John Rydzewski
Newark, Delaware 1972 Ambassador 4dr Brougham, 360/2BBL/727 purchased new 1968 AMX 390/Auto 1957 Hudson Hollywood 327/Auto 1975 Cadillac Eldorado 1992 Lumina Z34 5 speed |
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