Bypass hose??? - JeepForum.com
 
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post #1 of 9 Old 09-19-2019, 06:25 PM Thread Starter
Ermbe5
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Bypass hose???

I have/had a hose on my 1982 CJ7 4.2l that burst and I’m having a hard time finding a replacement. The hose runs from my thermostat housing to the intake manifold. The hose fitting at the t-stat housing is for a 7/8 inch hose (I tried 3/4” and it doesn’t fit) and the hose fitting at the intake manifold fits a 5/8 inch hose. I believe this is for a bypass hose. You can’t look it up by application, no one seems to carry 7/8” hose so I ordered online but now I can’t find a fitting to go on the intake to fit the 7/8” hose. What have you all done to replace this hose??

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post #2 of 9 Old 09-19-2019, 06:42 PM
Axhammer
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Is this the hose you are talking about? The one that is spliced in the middle? It looks like mine uses two different size hoses spliced in the middle. When I first got this Jeep is was leaking a little, I think the bigger size hose is just clamped to the smaller splice, but after being tightened it quit leaking so I havent given it much thought since.

Im going to drain the coolant so I can remove my heater box tomorrow, and replace my blower motor with the YJ style fan motor. Ill check it out closer tomorrow and let you know for sure.
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post #3 of 9 Old 09-19-2019, 06:49 PM Thread Starter
Ermbe5
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Yes that’s the one! Sounds like I’ll need to splice and reduce it down. Thanks! And yea I’d be happy to hear what you find tomorrow
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post #4 of 9 Old 09-19-2019, 08:34 PM
Hoover7
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This thread may also be of value for the heater hose question.

https://www.jeepforum.com/forum/f8/h...-size-3987737/

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post #5 of 9 Old 09-19-2019, 08:37 PM
BagusJeep
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it is described in the parts book as Hose, Bulk, 1 foot. Not helpful, but that is why you cannot find it on line

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post #6 of 9 Old 09-20-2019, 08:53 AM Thread Starter
Ermbe5
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Thanks for the information, it was very helpful. I just bought some bulk 7/8” hose online. Funny that everything thing I’ve read says it’s a 3/4 to 5/8 hose. I tried using 3/4” and it did fit. Oh well what ever I can make work, works. Thanks for the info and help!
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post #7 of 9 Old 09-20-2019, 08:16 PM
Axhammer
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I took my bypass hose off, and disconnected each end from the 5/8 by 3/4 brass adapter in the middle. I wanted to confirm what I had and what I need to make it right. It had two hose clamps on the manifold end of the 5/8” hose, because it has leaked in the past, so my kid put a second clamp on it to get it to stop leaking. I had forgotten about the situation until reading this thread. Since I was taking the valve cover and heater box off today, I figured why no fix this bypass situation too. I’m not sure what I’ll put back on, but it will be new hose if nothing else. The 3/4 hose has a molded in curve, it’s not a straight section like the 5/8 hos end.
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post #8 of 9 Old 09-21-2019, 05:43 AM
keith460
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That hose is hard to find in stock molded size and length. I bough a NOS one from a Wrangler parts website in 2007 and it was the last one they had.


Guys have success using and trimming these hoses that can be used:
NAPA #NBH 10763
Gates #18078
Dayco #87305
Dayco #E80416
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post #9 of 9 Old 09-21-2019, 07:07 AM
Axhammer
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My thoughts on this since the OEM style hose seems unobtainable. The 5/8 90 degree fitting on the aluminum manifold, uses pipe thread to attach to the manifold, it Looks like 3/8 PT to me, but when I tried to break torque to remove mine it was on the verge of breaking off or rounding, so I stopped. If a person were to remove this 90 degree 5/8 hose fitting, and replaced it with a 3/4 straight fitting, a single piece of 3/4 heater hose could be used, it would bend and take the big U shape just fine I believe. It would stick up higher, and look different, but it would be a repair unlikely to fail or leak. If a 3/4 heater hose with a ninety degree bend on one end, with the other end being straight were obtained and a 3/4 ninety degree installed on the manifold, it would look OEM. There are options, depending on what you want the end result to look like, and whether or not you have a good hydraulic hose business/store locally. A good hose store will have these basic fittings, making the rubber hose part of the deal easier.

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