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Disco 2 V8 4.0. Expansion tank was intermittently pressurising A LOT. On a couple of occasions it lost nearly all the water & overheated. No sign of where the water is going - I think most came from the expansion tank overflow & was vaporised on the exhaust. I have tried various fixes and...

FIXED :-) The clue was the thread on the old header tank which was quite 'sharp', the thread should have a square profile edge (to match the inside of the cap). I think because the old cap was holding too much pressure water had been lost. The previous owner had obviously been taking the cap...

I think it is fixed - or rather will be soon. A while back when this first started I changed the expansion tank filler cap it was holding massive pressure in the system - the top hose was still rock hard the next day when cold, and it took about 30 secs to remove the cap and let the pressure...

Grrrr. The old pump squeaked and felt loose so I was hopeful. New pump fitted and belt at the same time. Now all nice & quiet but... still losing water somewhere. Have to get the heads off I suppose - won't be able to do it this weekend, just have to keep topping up for now and no long...

OK cancel this, thanks. I just needed to be brave and tighten the 15mm nut and keep going until it swivelled & released the tension. Doh!

I should add that I thought I knew what it was but the bolt in the middle its just that, a bolt that I can tighten or undo. I refer to the 15mm bolt, The smaller thing it attaches to has a 13mm bolt, I can also undo that or tighten it up. I thought there should be something that is spring loaded.

I read the RAVE manual but I cant find the thing mine looks different, which one is it ? https://dl.dropboxusercontent.com/u/82920844/Pulley%20Belt.jpg

Compression test shows all cylinders exactly (well nearly) the same, no issues. Gas analyser on the header shows no problem. Additive in the water test (to show colour change if CO2 present) no problem found. Oil is clean. Here is a good one... on Saturday I did about 25 miles and then...

But Steel seal say they guarantee a fix or your money back. It sounds too good to be true, but does it actually work, and does it cause other problems. So just wondering what the outcome was.

Did Steel Seal work ?

That depends on what I find really. I suppose the "purist" view might be that you should do this as a matter of course, and if time (& money) were no problem I probably would. But I need to complete the work as quickly as possible as I currently don't have a garage so will be borrowing space...

Phew, no tapping noises, the engine sounds sweet so fingers crossed it's not a liner. Have ordered a gasket set (with head bolts), so looks like i'll be busy soon.

AArgh. No it's started using water again at an alarming rate. Engine running sweetly, no water in oil either, but blowing water out of the overflow again. Just ordered a new pump just in case but I cant see how that could pressurise the system. I'm guessing head gasket - but does the...

Yes !! :D it is now fixed, no loss at all and level staying where it should. It seems that after replacing the pressure cap it takes some days for this to work through ! Doesn't sound possible but it must be the case I have made no other changes. Also the back-up evidence is the hissing in the...

Can't explain this but now losing less, more like 1/2 litre in 50-60 miles. Maybe the reduced pressure due to new cap takes some time to work it's way through the system ? Doesn't sound likely though. I'll monitor it for a week and see what happens.

Thanks Peter I'll have a look. Latest update, the new header tank cap needed an extra twist to ensure it is tight enough - it is now. No water leaking from this area at all now, and also not holding pressure inside, which the old cap was, so the new cap is doing it's job properly...

My car has started to loose coolant, a lot of it. There are no signs of leaks anywhere that can be seen underneath, although I have seen some water in the area of the expansion tank, and there is a smell which may be burnt anti-freeze. The car starts perfectly first time (no initial misfiring)...

Hi folks. A late addition to this thread which I have just found. Recently re-joined Landyworld with a V8 Disco8 (4.0). Mine has also gurgled from time to time under the dash. Was a bit alarming at first but no leaks found, engine running perfectly etc. Suddenly after about 3000 miles I had...

Mikev8se - I have 16" wheel. The tyres are 255/65 R16 109T General Grabber AT . The AT2's are available all over the place. I had to search for ages to get the new AT's, in the end I found them in a small local company in Andover, they were about £110 each including fitting etc.... just a...

Just fitted AT's - hard to find 'em though !