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Has anyone come up with an alternative expansion tank? I've replaced this one twice with OEM ones....


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....got a local salvage yard guy that doubles as a jeep guy, he has a ton of NOS parts for jeeps, including these tanks, The "original popped a few weeks into the resurrection, then the NOS replacement lasted a few years and then this NOS replacement has started cracking on top just like the others. I decided to use some under water JB Weld and it has halted the seepage of coolant from the tank for quite a while now. just know I'm due for a failure anytime. They are only $25 bucks for the NOS ones , guess I should buy another and keep it behind the seat !

 

Other than the standard radiator swap/conversion , is there any kind of replacement tank for these things? I'd like to leave the system as it is.Sgt_Rock19884_0Jeep7-vi.jpg

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The original from Lyon France lasted 20 years, replaced with OEM crown that lasted 5 years. Now running a Macs aluminum in a closed system, going on 5 years and no problems. This one should last till the end of my jeep life...

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no overflow tanks on open system?

An open system needs an expansion tank.

 

If the MAC's aluminum tank had been available when I did my '88 XJ, that's the way I would have gone. But ... it wasn't, so I used a Moroso aluminum surge/expansion tank from a local speed shop. It's also sold by Summit racing.

 

 

I run it with an overflow bottle:

 

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Look at the tanks in any mid-90's mopar.  They are tough, tough, tough nylon and have a real radiator cap.  they are shaped a bit differently but if you remove the bracket that mounts the OEM tank, you can mount them directly to the firewall.  no issues with hood closing.

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^^^^ This is what I did, short of going HO radiator I believe this is the best way to go. don't care for the aftermarket plastic or metal tanks because you still keep all the funky hose routing. Reasons for converting: straight shot for heater hoses, simplified hose routing, less hose connections that can leak, and the cost difference between a metal tank, stock plastic, and the hose filler neck. So if you gonna fix it, why keep it obsolete?

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Thats probably the best and most economical route to take considering the price of the Macs.  I must admit I'm getting a bit of coolant squeezing past the 15 lb rad cap when the ambient temperature is above 30C (86F) as I have the overflow  blocked. I think an overflow bottle is in my future too.

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 I must admit I'm getting a bit of coolant squeezing past the 15 lb rad cap when the ambient temperature is above 30C (86F) as I have the overflow  blocked. I think an overflow bottle is in my future too.

 

 

Maybe you have the tank over-filled. You need room for expansion. Take the cap off when it's cold, where is the coolant level at?

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^^^^ This is what I did, short of going HO radiator I believe this is the best way to go. don't care for the aftermarket plastic or metal tanks because you still keep all the funky hose routing. Reasons for converting: straight shot for heater hoses, simplified hose routing, less hose connections that can leak, and the cost difference between a metal tank, stock plastic, and the hose filler neck. So if you gonna fix it, why keep it obsolete?

 

Good question...........

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^^^^ Filler neck conversion?

FWIW, when I did mine I found that the upper radiator hose is tapered, meaning the inlet/outlet sizes on the hoses are different diameter, I had a  hard time gettin the filler neck installed into the upper hose {was a b*t*h, but I got it), don't they make this adapter with different inlet and outlet diameters to ease installation?

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^^^^ Filler neck conversion?

FWIW, when I did mine I found that the upper radiator hose is tapered, meaning the inlet/outlet sizes on the hoses are different diameter, I had a  hard time gettin the filler neck installed into the upper hose {was a b*t*h, but I got it), don't they make this adapter with different inlet and outlet diameters to ease installation?

Huh? 

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I did 3 of them with no issues at all. Was it the 63745 Moroso or the one with 2 different sizes? 

 

Been so long, not sure what the part # was. I do know that I was wishing for one with different inlet outlet diameters.

 

Weird. The hose is the same diameter in the middle...........

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