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cobra_mark



Member Since: 17 Feb 2015
Location: West Yorks
Posts: 213

United Kingdom 2000 Defender 90 300 Tdi SW Barolo Black
Core plug weeping oh blast
Looks like the tell tale table spoon of coolant in the fillet at the bottom of the exhaust side of the engine is a weeping core plug, only happens after a run as the pressure builds up.

I am tempted with a sealing treatment like K-Seal but not happy about bunging up the internals.

Summer will see a bigger strip down maybe all the way but that is a bigger job.

I may get sound epoxy resin over it if I can get access not sure to be honest.

Any advice welcome.


Click image to enlarge
Post #605038 26th Feb 2017 7:32pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20294

United Kingdom 
I'd live with it for now, keep an eye on engine temp and coolant loss.
Then go for a proper fix, avoid using additives to seal it.
I was recommended to fix rather that use a temp seal when I had coolant leak issues and I'm glad I did.

Thumbs Up ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️
Post #605041 26th Feb 2017 7:47pm
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cobra_mark



Member Since: 17 Feb 2015
Location: West Yorks
Posts: 213

United Kingdom 2000 Defender 90 300 Tdi SW Barolo Black
Thanks Steve, will start getting a list of bits to get.

I have read somewhere that the removal can strip the alloy head thread if it is removed, som put a strong epoxy around exposed threads and screw it back up, hate to make it worse by wrecking the head. Crying or Very sad
Post #605043 26th Feb 2017 7:51pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20294

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I would get further advice on that, and go from there. Thumbs Up ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️
Post #605054 26th Feb 2017 8:04pm
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ian series 1



Member Since: 17 Nov 2014
Location: south
Posts: 3127

United Kingdom 2008 Defender 90 Puma 2.4 CSW Bonatti Grey
I had this problem on my Disco 2, the bung that's behind the manifold is threaded, I did the head gasket on it, and I'm sure I wrapped some PTFE tape around the threads to seal it?
It was a few years ago, but quite a straightforward fix, if that's where it's defenetly coming from? 80" 80" 86" 88" 90"

Wanted, Forward Control Anything considered.
Post #605060 26th Feb 2017 8:12pm
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cobra_mark



Member Since: 17 Feb 2015
Location: West Yorks
Posts: 213

United Kingdom 2000 Defender 90 300 Tdi SW Barolo Black
Thanks Ian, I am 90% sure but until I strip down the manifold side won't be sure.

The Pte tape is a good clean idea, thanks. Thumbs Up
Post #605063 26th Feb 2017 8:16pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554


Click image to enlarge


then you strip down the manifold side check the plug that's the end arrow had coolant leak on same side tuned out to be the plug seal had failed



Click image to enlarge


its not Core plug but 1 inch steel plug see below LCM100170



Last edited by dorsetsmith on 26th Feb 2017 8:56pm. Edited 5 times in total
Post #605069 26th Feb 2017 8:23pm
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derbywill



Member Since: 25 Mar 2010
Location: Derbyshire
Posts: 556

England 2005 Defender 90 Td5 XS CSW Java Black
Do not use any type of sealer ! My Fathers Td5 Discovery had this leak when he purchased it the last owner must had been using rad weld or something similar. And we have had problems ever since, water leaks, heater not getting hot etc.
We have changed the radiator water pump, hoses etc.
On Saturday I was replacing the 'o' rings on the heat exchanger and found one of the pipes completely blocked!


Click image to enlarge



Click image to enlarge



Click image to enlarge
 2005 90 XS
1954 86'' Series 1 tilt
1968 88” 2A 200tdi
2002 110 Hardtop
Post #605073 26th Feb 2017 8:27pm
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cobra_mark



Member Since: 17 Feb 2015
Location: West Yorks
Posts: 213

United Kingdom 2000 Defender 90 300 Tdi SW Barolo Black
That's made it clear no additives and a summer strip down, should not get too Leakey as the plug leak is only a large table spoon each drive. Thumbs Up
Post #605076 26th Feb 2017 8:34pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17342

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
My Disco2 has been doing that for more than a decade. Keep the coolant topped up and it'll be OK until you can fix it.
Post #605092 26th Feb 2017 8:59pm
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cobra_mark



Member Since: 17 Feb 2015
Location: West Yorks
Posts: 213

United Kingdom 2000 Defender 90 300 Tdi SW Barolo Black
That's lowered the stress a bit Smile will start gathering the parts and a new core plug part number stated earlier.
Post #605094 26th Feb 2017 9:03pm
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rallysteve



Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2225

United Kingdom 2002 Defender 110 Td5 DCPU Keswick Green
That brown gunge in the coolant system looks like a tell-tale symptom of someone topping up the OAT coolant with the normal etylene glycol stuff. Turns to brown sludge.

I would never use radweld or other similar products though. They do make a real mess of the coolant systen and block heater matrices and thermostats. Either live with the leak or fix it properly.

Steve 02' 110 TD5 Double Cab Rebuild Thread
Post #605097 26th Feb 2017 9:06pm
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cobra_mark



Member Since: 17 Feb 2015
Location: West Yorks
Posts: 213

United Kingdom 2000 Defender 90 300 Tdi SW Barolo Black
Will get a full flush this summer when I sort this plug out, definitely not going down the rad weld path.
Post #605186 27th Feb 2017 8:15am
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geobloke



Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

United Kingdom 
I cannot tell you how glad I was that I flushed the coolant system on my TD5 properly. What an amazing difference to the heater output (hot to volcanic). This was 5 years ago now and everything (coolant-wise) is still working beautifully.

I think all in all it took a good morning of getting drenched. But worth it. Noticed that the Rad is looking a little tired now, so expect that a new one will be in order this summer and a re-flush as well.

Thumbs Up
Post #605217 27th Feb 2017 11:14am
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20294

United Kingdom 
Am I correct in thinking to flush the system it's just a gravity fed flush though?
Pretty sure there shouldn't be any pressure used.

Is that correct? ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️
Post #605218 27th Feb 2017 11:24am
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