Overflow tank issues - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions


Reply
 
Thread Tools
  #1  
Old August 23rd, 2004, 04:08 PM
Doug's Avatar
Doug
Status: Offline
Doug Walker
TVR5L-powered NAS D-110
Member
 
Join Date: Oct 2003
Location: Los Angeles, CA, USA
Posts: 880
Overflow tank issues

Looking for some ideas. I've just increased the capacity of my radiator by 33%, and also replaced the 3.9 with a 4.6 modified engine. I've got things worked around so the temp is steady at 190 degrees. But she still pisses a bit of coolant now and then, even with no pressure in the system (can squeeze the radiator and heater hoses while running at full temp and you can feel there's little or no pressure build up anywhere). Everything else is good. (Analog temp gauge, in addition to the stock temp gauge, directly reading the radiator temperature at 190.)

So what I'm thinking is that the 3.9 93 110 overflow tank is just to damn small for the bigger block and vastly increased radiator size....

Thoughts? Suggestions?

DW
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old August 23rd, 2004, 04:31 PM
Mike Hippert's Avatar
Mike Hippert
Status: Offline
D-90Slut/Stalker,SNLPres
94 D-90 Grinding Rover
Member
 
Join Date: Sep 2003
Location: Manchester NH USA
Posts: 4,789
Or your over flow tank has a crack in it. Your Cooling system should be under 15 to 16 lbs of pressure. When coolant is pressurized the boiling point increases, so your cooling system can have water in it and not boil over at 212*F. But if your expansion tank has a crack then the system will not pressurize and the water will start to boil out at a lower then overheating temp (240*F). I would have the tank pressure tested, and if it is leaking you can have it soldered up. This is just an idea, you said you are not building pressure, is that just based on squeezing the hose or when you pop the cap off the expansion tank it does not hiss, or relieve pressure. You can also get a pressure tester at an auto parts store yourself and check the system (works good to find leaks also).

Like I said just an idea.
__________________
Don't forget to
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
first then ask questions later! The loose nut behind the wheel
Reply With Quote
  #3  
Old August 23rd, 2004, 04:44 PM
Doug's Avatar
Doug
Status: Offline
Doug Walker
TVR5L-powered NAS D-110
Member
 
Join Date: Oct 2003
Location: Los Angeles, CA, USA
Posts: 880
Mike, wouldn't I then get a leak at the crack? There's no coolant appearing anywhere but from the overflow tube...
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old August 23rd, 2004, 05:32 PM
BarryO
Status: Offline
Barry O'Mahony
97 D-90 SW LE
Member
 
Join Date: Dec 2003
Location: Bend, OR
Posts: 281
Or the cap on the tank isn't holding pressure.

The tank on my wife's Disco developed a leak on the tank right at the seam. Would only leak when the fluid level got up to the seam itself, but the system wouldn' hold pressure.
Reply With Quote
  #5  
Old August 23rd, 2004, 05:57 PM
Mike Hippert's Avatar
Mike Hippert
Status: Offline
D-90Slut/Stalker,SNLPres
94 D-90 Grinding Rover
Member
 
Join Date: Sep 2003
Location: Manchester NH USA
Posts: 4,789
True it would leak from the crack; I wasn't to sure where yours was leaking from. And good point on the cap Barry, you can get a new cap at the auto parts store, I have one with a handle you pull to unlock and let the pressure out. The overflow tank hold I think between 1/2 and 3/4s of a gallon, I would think that would be enough. When it spits out, if you let it cool off over night does the amount of coolant in the overflow tank decrease?
__________________
Don't forget to
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
first then ask questions later! The loose nut behind the wheel
Reply With Quote
  #6  
Old September 15th, 2004, 10:23 PM
Doug's Avatar
Doug
Status: Offline
Doug Walker
TVR5L-powered NAS D-110
Member
 
Join Date: Oct 2003
Location: Los Angeles, CA, USA
Posts: 880
BTW it was the cap. Had an aftermarket cap on it -- replaced with genuine and no problem.

News: re-doing the rad again. The oversized rad still won't cool the TVR on hill climbs, so in looking for a solution I just discovered that the new Morgan remakes, which are powered with the same TVR 5.0 as mine, all run hot. The Morgan dealer out here has solved the issue using wide-tube race-tech Farrari radiator cores. Works 100% of the time, brings the Morgan temp gauges down from pinned to lower 1/4 of the dial. On and on, but I'm feeling pretty confident on this one....

PS Please don't ask about the money. I'm taking that data to the grave with me.


DW
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
hose from overflow tank to radiator defender1844 Smaller Projects 2 July 28th, 2008 11:08 PM
FAO:Buckon37 or any air tank user... Cube II Defender Technical Discussions 9 July 4th, 2005 04:05 AM
Aux tank and LR winch bumper Jase For Sale - Parts 10 July 1st, 2005 06:38 PM
Rover-X Aux Fuel Tank and kit 4Sale bigrenna For Sale - Parts 2 November 18th, 2004 05:35 PM
Adding a Side Tank - Alternate Filler Method JimC Misc. Chit-Chat 6 October 25th, 2004 12:29 PM

» Defender Registry

Cella

D110DC

Tithonus

Stilts
Add your Defender

All times are GMT -5. The time now is 09:15 PM.


Copyright