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coolant tank or cap replacement?

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  #1  
Old 04-30-2016, 07:40 AM
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coolant tank or cap replacement?

The level of the coolant on my tank is lowering despite i have added. Ive noticed some fluid next to the cap, so i guess that where it must be leaking from. Car has just over 100.000km, you think i should replace the whole tank or just the cap?
 
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Old 04-30-2016, 07:48 AM
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After 100K, I'd replace the tank regardless. There is a record of the plastic seam failing. I just replaced mine not long ago with one of these.
http://www.ebay.com/itm/Mini-Cooper-...1T6n73&vxp=mtr
A buddy helped, pliers spread and slide the clamps down and push the hoses off with a flat blade screwdriver. Bolt the new can in place and lube the two pipes with a bit of coolant and the hoses slide right on and work the clamps back up.
Use a baster to suck the fluid out of the old tank and set it aside to replace when you're done.
 
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Old 04-30-2016, 07:56 AM
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Τhanx, on one hand, that alloy tank is gonna last for ever and i dont know if its worth keeping the mini for more than 5-6years. On the other hand how can one check the coolant level?
 
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Old 04-30-2016, 08:57 AM
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Originally Posted by genik
Τhanx, on one hand, that alloy tank is gonna last for ever and i dont know if its worth keeping the mini for more than 5-6years. On the other hand how can one check the coolant level?
The metal tank is about 25% more than an oem tank. Well worth the peace of mind. My oem tank had no leaks, but I replaced it with the metal tank as a ten year wear item. Figured that would be the last time the tank would need replacing. The fluid in the metal tank can only be visually inspected by removing the cap as had to be done on the oem tank since they turn a dark brown color as they age. It is recommended that the metal tank be kept half full of fluid which is about 18 ounces. I made a dipstick out of a clear drinking straw marking the half way point at two inches from the end with a Sharpy pen. Insert the straw, cover the end, remove and view. The simplest way to check the fluid level is to remember visually where the level should be above the baffle. The metal coolant tank is the easiest and most cost effective remedy for an "easy to fix weak link in the cooling system". PS-I reused the oem cap since it was functional. I do however keep a hot spare in the boot. Good luck.
 

Last edited by buzzsaw; 04-30-2016 at 09:31 AM.
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Old 05-01-2016, 05:15 PM
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Coolant level on my 2010 base was dropping slowly. Upon examination I noticed that the O ring around the barrel inside the cap was missing. Replaced the cap (less than $10 on ebay) and the level stays solid.
 
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Old 05-01-2016, 11:29 PM
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Tio Bary you do have an interesting point. Here is what my coolant tank cap looks like, but i cant really know if there is something missing, but i cant see an oring available! Can anyone one have a look on his own to see if it looks like mine? Just remember we are talking about a 2008 R56S coolant tank cap here.
 
Attached Thumbnails coolant tank or cap replacement?-coolanttankcapr56s.jpg  
  #7  
Old 05-03-2016, 01:56 PM
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Hello Genik,


There is an O ring on the inside of the thermostat housing cap. You can see on the inside threaded center part a little bit inward.

https://www.ecstuning.com/Search/Sit...024/ES2734773/





Thanks


Mike
 
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Old 05-03-2016, 02:18 PM
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I this the O-ring that you are referring to? (i just marked it green)
 
Attached Thumbnails coolant tank or cap replacement?-oring-cap.jpg  
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Old 05-03-2016, 02:33 PM
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Yes.
 
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Old 05-03-2016, 02:35 PM
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Does the O-ring deteriorate after some time? Should it be broken and into the tank now?
 
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Old 05-03-2016, 02:37 PM
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I seen them split but thats after a long time and the seal popping out.
 
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Old 05-03-2016, 02:54 PM
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When you say long time?
 
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Old 05-04-2016, 06:22 AM
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My 2007 MCS needed replaced. I just did the whole expansion tank also as the bottom of the tank had a hairline crack.

https://www.northamericanmotoring.co...t-leak-or.html


 
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Old 05-04-2016, 06:35 AM
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Originally Posted by ECSTuning
My 2007 MCS needed replaced. I just did the whole expansion tank also as the bottom of the tank had a hairline crack.

https://www.northamericanmotoring.co...t-leak-or.html



You chose to go back with OEM rather than aluminum? Curious why?
 
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Old 05-04-2016, 06:39 AM
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I was doing all the cooling system at once, we had them in stock. Also the Forge ( metal ) one at the time was about a month out, they were sold out due to being so popular.
 
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Old 05-04-2016, 07:34 AM
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Originally Posted by ECSTuning
I was doing all the cooling system at once, we had them in stock. Also the Forge ( metal ) one at the time was about a month out, they were sold out due to being so popular.

Gotcha. Thought you had some skinny I wasn't aware of about the aluminum.
 
  #17  
Old 05-04-2016, 07:44 AM
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Welcome. no insider secrets here
 
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  #18  
Old 05-04-2016, 07:50 AM
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I'll be changing to an aluminum bottle shortly.
 
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Old 05-04-2016, 09:46 AM
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Can the aluminum be used for an R56S?
Is the cap the same as the OEM?
Any links to aluminum tanks that you have installed on your R56S?
 
  #20  
Old 05-04-2016, 09:53 AM
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Same cap for the R56+

https://www.ecstuning.com/Search/SiteSearch/17137823626


 
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  #21  
Old 05-04-2016, 10:01 AM
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Are there tanks other than the OEM that have a fluid level indication?
 
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Old 05-26-2016, 12:28 PM
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Regarding the O-ring, can one find it to place it instead of purchasing the whole cap? Isnt it a total waste to chuck away the cap just because of a small broken O-ring that costs very very little?
 
Attached Thumbnails coolant tank or cap replacement?-oring-cap.jpg  
  #23  
Old 05-26-2016, 12:32 PM
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There is no separate part from MINI. You Might have some luck as a A/C store with o rings.
 
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  #24  
Old 05-26-2016, 12:39 PM
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Originally Posted by ECSTuning
There is no separate part from MINI. You Might have some luck as a A/C store with o rings.
Great tip, thanx! But now that its broken, who knows what would be the correct O-ring diameter and thickness?
 
  #25  
Old 05-26-2016, 04:27 PM
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Originally Posted by genik
Great tip, thanx! But now that its broken, who knows what would be the correct O-ring diameter and thickness?
What ECS said, take the cap in to any auto parts store and the guy will have you on your way in no time. there's nothing magic about O-rings.
 
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