1989 Eliminator Posted September 3, 2013 Share Posted September 3, 2013 I just replaced my water pump on m y 1989 MJ 4.0L. During this project I noticed that the lower raditor hose going from the bottom of the radiator to the bottom of the pump has a spring inside to keep it form collasping. That spring is rusted to crap and peices are breaking off from it so I just bought a new hose. BUT I would like to put a new spring back inside. Can anyone tell me a place to but this spring or a pre-assembled hose with the spring already inside? Link to comment Share on other sites More sharing options...
oldseddie Posted September 4, 2013 Share Posted September 4, 2013 I use stainless safety wire around a mandrel to form my own. Baling wire would probably be fine to. Use an appropriately sized pipe for a mandrel. Link to comment Share on other sites More sharing options...
Akula69 Posted September 5, 2013 Share Posted September 5, 2013 I used to have a thread on here about overheating and the bottom hose collapsing, but I cannot find it now. The gist of it was the hose with the spring is no longer available, and I wnet to NAPA and, after looking through all thier hoses (the owner is a friend) I settled on a chevrolet hose with a spring in it...took it home and cut the spring out, then threaded it into the jeep hose. If I could find the thread I have the NAPA hose part number in it.... Link to comment Share on other sites More sharing options...
ftpiercecracker1 Posted September 5, 2013 Share Posted September 5, 2013 Junkyard. :thumbsup: Gotta find a factory one, not really that hard honestly. Link to comment Share on other sites More sharing options...
1989 Eliminator Posted September 5, 2013 Author Share Posted September 5, 2013 Okay I was just wondering if there was some long lost auto part place that still had them in stock. Thanks! To the graveyard! Link to comment Share on other sites More sharing options...
HOrnbrod Posted September 5, 2013 Share Posted September 5, 2013 I used to have a thread on here about overheating and the bottom hose collapsing, but I cannot find it now. The gist of it was the hose with the spring is no longer available, and I wnet to NAPA and, after looking through all thier hoses (the owner is a friend) I settled on a chevrolet hose with a spring in it...took it home and cut the spring out, then threaded it into the jeep hose. If I could find the thread I have the NAPA hose part number in it.... You didn't look hard enough Jake. :yes: After some research, (thanks for the post on the Mustang spring) I found an exact fit spring for the MJ bottom hose. Unfortunately, it appears in a hose for a 1970 Chevrolet pickup, and NAPA carries the hose as part number 7580. Once you cut the hose open and remove the spring, it simply threads into the MJ hose from the small end without too much effort. It supports the entire hose except for about 2 inches from either end. THe hose will not collapse with it in place. Link to comment Share on other sites More sharing options...
1989 Eliminator Posted September 6, 2013 Author Share Posted September 6, 2013 Well I looked up that hose in Napa and in the description it says there is no spring/coil that comes in the hose :/ Link to comment Share on other sites More sharing options...
johnnyc Posted September 6, 2013 Share Posted September 6, 2013 Last time I needed one of those springs, I went to the junkyard, found the newest XJ they had, and pulled the spring out of the lower hose. And they didn't charge me for it. Link to comment Share on other sites More sharing options...
johnnyc Posted September 6, 2013 Share Posted September 6, 2013 Double post Link to comment Share on other sites More sharing options...
88mjblue Posted January 21, 2015 Share Posted January 21, 2015 What if you don't put the spring in, is it really that bad? I just replaced my lower radiator hose, found that the old hose did not have a spring, and I decided to install the new hose without a spring. It was fine before, and works fine now (no collapsing or overheating) so is the spring really necessary? Link to comment Share on other sites More sharing options...
daking Posted January 21, 2015 Share Posted January 21, 2015 the wire coil, commonly called a "spring" is not a spring at all. Its to keep the bottom hose from collapsing at high engine RPM, from the suction of the pump. Commonly used solution in the past hose designs. Newer model hoses are built different, to handle the suction. IMO, though, if you have the coil, re use it. Link to comment Share on other sites More sharing options...
88mjblue Posted January 21, 2015 Share Posted January 21, 2015 My newer model hose is pretty soft when squeezing, so that's why I was initially concerned. You mentioned high RPM - I don't really rev it that high ever (rarely above 4k) so that may be why I haven't experienced a collapsing hose. When the hose does collapse, what happens? I see how this would restrict coolant flow, but does it go back to normal after a sec? Link to comment Share on other sites More sharing options...
daking Posted January 21, 2015 Share Posted January 21, 2015 Usually you'll notice this problem when cruising. Engine will overheat. It can be hard to trouble shoot, as most will focus on the water-pump, Thermostat, and radiator as the cause of the over-heating. Removal of the thermostat will usually make it worse, causing more confusion in the trouble shooting path. Cause, the person is thinking by removing the thermostat, that the flow will be faster, hence a cooler engine. But that faster flow will enhance the issue of the hose. Same with installing a hi-flow pump. Hose returns to normal, so visually its hard to spot. With truck parked, you can watch the hose as the engine is rivved up. If you see the hose closing, then the problem is there. I just put a new lower hose, and it too was missing the coil. The new hose does not seem hard. I Put a hi-flow thermostat and hi-flow pump. So, I'll be watching that lower hose when I start driving this this jeep, in 2018... Link to comment Share on other sites More sharing options...
Eagle Posted January 21, 2015 Share Posted January 21, 2015 My newer model hose is pretty soft when squeezing, so that's why I was initially concerned. You mentioned high RPM - I don't really rev it that high ever (rarely above 4k) so that may be why I haven't experienced a collapsing hose. When the hose does collapse, what happens? I see how this would restrict coolant flow, but does it go back to normal after a sec? People who have encountered the collapsing hose typically see it on the highway. The hose does not return to normal after a "sec." The reports typically are that they have to pull over and shut off the engine to let it cool down. The hose "may" (not "will") open up again after ten or fifteen minutes. Then they start up again, and repeat the cycle a few miles down the road. I would definitely get a spring from somewhere. And 4,000 RPM is revving it pretty high on an engine with a 5,000 RPM redline. The 4.0L Jeep engine is a torque engine, not a race engine. IMHO there's no need or reason to rev it anywhere near 4,000 RPM -- ever. Link to comment Share on other sites More sharing options...
Jeep Driver Posted January 21, 2015 Share Posted January 21, 2015 I've never encountered this problem but it I did- Mandrel bent tube and two silicone connectors and forever solve the problem......or.........silicone L shaped hose and cut to fit. Link to comment Share on other sites More sharing options...
Jeep Driver Posted January 21, 2015 Share Posted January 21, 2015 Link to comment Share on other sites More sharing options...
91Pioneer Posted January 21, 2015 Share Posted January 21, 2015 The factory service manual says the spring is required, so it should be in place. If you don't have one, get one from the junkyard or make your own (although I don't recommend that). When I swapped my parts a week or two ago, I transferred the spring (and protective sleeve) over to the new hose. I'm not entirely convinced that newer hoses negate the need for the spring. If you were to mount a GoPro under the hood pointed to that hose while driving you could see for yourself, but I chose to just move the spring over and know I'll never have to worry about the hose collapsing. Link to comment Share on other sites More sharing options...
HOrnbrod Posted January 21, 2015 Share Posted January 21, 2015 ^^^ This. I do the same thing since I have a few springs left over from old hoses I have changed out in the past. Maybe it's not necessary with the new "stronger" lower hoses, but it's one less thing you don't have to think about. Link to comment Share on other sites More sharing options...
Guest Posted January 22, 2015 Share Posted January 22, 2015 Did some digging around on this subject some time ago. I read that the spring was there as a preventative measure from the factory when the engine was still in the break in period, in order to alleviate the potential "suction" the water pump would do at higher cruising speeds / under strenuous loads. Many have reported that there isn't a reason to run the spring by the time you end up replacing the original hose anyway. There any truth to this, or is it a bunch of phooey? I don't mind it being in there, but seeing as there's no definitive PN... :dunno: I still have the OE one inside my lower hose, but it's definitely seen better days. I'm assuming the newer XJ's still had it in the lower hose as well? Link to comment Share on other sites More sharing options...
91Pioneer Posted January 22, 2015 Share Posted January 22, 2015 The 1991 factory service manual which I have in front of me states: Radiator lower hoses are spring-reinforced to prevent collapse from water pump suction at moderate and high engine speeds... When performing a hose inspection, inspect the radiator lower hose for proper position and condition of the spring. The manual has more credibility in my mind than Internet opinions. It says make sure the spring is there and in good shape, then I'll do that. If it stated "the spring is there to assist with factory fill of coolant and can be discarded if the hose is replaced" would be a different ball game. FYI in my opinion the construction of the aftermarket Gates hose that I put in my truck had the same construction as the OEM hose (not including the spring). It did not feel any stiffer or less flexible than the original hose, so in my opinion the spring is required. Link to comment Share on other sites More sharing options...
ParadiseMJ Posted January 23, 2015 Share Posted January 23, 2015 I ran my XJ without the spring for 7-8 years with no overheating problems, If you're having overheating issues you could easily go to the hardware store and find an appropriate sized stainless steel spring. Be it a door spring, a gate spring a thing-a-ling spring, look around, you'll find it. Even a dealer may have a NOS hose with the spring. I have a spring in the MJ that I got from a member here (thanks Cracker) because I was having non- related overheating problems and was up to trying everything...turned out it was the radiator. I feel pretty confident that the MJ would be O.K running without it...but I'm happy it's there to keep that issue eliminated. Keep looking. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now