 | Home > Tdi > Where has my coolant gone? |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347   
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Had a bit more of a poke around today.
There are no visible signs of leaks on the engine at all (which for a 200Tdi is a miracle!) No steam from exhaust No oil contamination No bubbles in expansion tank (other than coming through from the radiator when agitating hoses) No signs of wetness or residue around any joints or p-gasket. Expansion tank is pressurising. No misting on the windscreen or smell of coolant from the heater blowers. No chuffing from oil filler or expansion tank. All I can think of is ether a crack in the head which is only opening up under turbo pressure or when hot, filler cap is week and letting steam escape (though no residue present or steam visible) or head gasket has gone slightly but not enough to cause any contamination. What tests can I do? Any suggestions? Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197 Self confessed mileage hunter  |
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5th Aug 2015 6:57pm |
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| willy eckerslike Member Since: 15 Jun 2009 Location: North yorks Posts: 1789 
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Check the P seal behind water pump pretty common place to leak, quite hard to see.
 Original Member Pie n Pea Club.
110 HCPU Tipper |
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5th Aug 2015 7:02pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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I have checked and nice and tight and dry as it was done in 2012 with timing belt.
 Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197
Self confessed mileage hunter |
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5th Aug 2015 7:05pm |
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| Browny90 Member Since: 20 Jul 2015 Location: Derbyshire Posts: 183 
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Fill it back up and see if it goes down again to start with..
Dump some radweld and do the same again. Go to a garage and gave the cooling system pressure tested maybe? My 1986 90 is currently on a full rebuild, with new chassis, Paint etc.. Very much a hybrid, TD5 Chassis, tub & bulkhead with a 200TDI and LT77 GB Painted in Stornoway Grey  2 years off the road, but getting close to completion now |
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5th Aug 2015 7:05pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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Did 50 miles to work and back today and its not moved enough to notice.
I don't want to put any rad weld in it as I have never heard anyone use it successfully. I'm enquiring with local garages to find if they can pressure test it
Are there any home kits or tests I can do? Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197 Self confessed mileage hunter |
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5th Aug 2015 7:15pm |
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| Browny90 Member Since: 20 Jul 2015 Location: Derbyshire Posts: 183
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When I worked for scania trucks I modified a header tank cap with a tyre valve (drilled a hole and fitted a normal tyre valve with some tiger seal) not perfect but worked for me, if you do it, maybe fit a small hose and guage? And don't put too much pressure in.
You might be lucky and hear a leak or the pressure might drop quickly? Like I said before, it may have been a void that's now been filled.. I would give it more time and see if it goes down over a couple of hundred miles. My 1986 90 is currently on a full rebuild, with new chassis, Paint etc.. Very much a hybrid, TD5 Chassis, tub & bulkhead with a 200TDI and LT77 GB Painted in Stornoway Grey 2 years off the road, but getting close to completion now |
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5th Aug 2015 7:34pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558 
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Test to a MAXIMUM OF 15PSI
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5th Aug 2015 7:40pm |
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| Browny90 Member Since: 20 Jul 2015 Location: Derbyshire Posts: 183
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^^^^^^^ What he said! ^^^^^^
My 1986 90 is currently on a full rebuild, with new chassis, Paint etc.. Very much a hybrid, TD5 Chassis, tub & bulkhead with a 200TDI and LT77 GB Painted in Stornoway Grey 2 years off the road, but getting close to completion now |
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5th Aug 2015 7:42pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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Haven't been able to work on it this week as it has been a bit manic.
Checked the level this morning (having been topped up on Tuesday) and it had dropped about an inch. I'm at a loss its so weird, everything suggests it is leaking but there are no leaks! Its having some tests done tomorrow otherwise its looks like its head off time  Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197
Self confessed mileage hunter |
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7th Aug 2015 12:27pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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Also, possibly silly question.
On a 200tdi, should the radiator top cap have liquid all the way up to the top of the radiator? Reason being there always seems to be about an inch gap when everything settles down? Should it always be full as theoretically the radiator is lower than the level of the expansion tank? Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197 Self confessed mileage hunter |
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7th Aug 2015 12:29pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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I will take it off tomorrow and give it a blow through
Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197
Self confessed mileage hunter |
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7th Aug 2015 8:33pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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Check the metal end pipes too
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7th Aug 2015 8:37pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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Metal end pipes?
The heater return ones? Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197 Self confessed mileage hunter |
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7th Aug 2015 8:44pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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No the bits the small pipe pushes on to , as thats the smallest part one on the rad , one on top of engine , one on header tank
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7th Aug 2015 9:12pm |
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