Originally Posted by redwhitekat

Originally Posted by ljdiscovery

By way of background, I bought a 2000 Discovery a couple of weeks ago. The PO told me that he had it diagnosed with a bad head gasket and likely in need of a new engine. He had parked it last year and it had been sitting his garage since. I bought it sight unseen and had it towed to San Diego from LA. I was ready to put in a new motor. I charged the battery and it started right up. It seemed to run great, other than a squeeky belt pulley.

I did notice at least three distinct head gasket leaks, one from each side at the back of the engine and one on the front corner of the driver's side. The leaks were such that a drip would develop every 3 or 4 seconds and run down the block and drip onto the ground while idling. There did not appear to be any combustions gases leaking into the cooling system, it looked like it was all external. I also check all of the spark plugs and they all looked good.

I have used White Shepherd by Universal Products on the transfer cases on a couple of my Discoverys with good results (I have no affiliation with Universal Products). Universal Products also makes a head gasket fix called BLUE DEVIL. They have two formulas, one Mechanic Style and one Pour-N-Go. The Mechanic formula requires a free-flowing system, ie removal of the thermostat. I couldn't figure out how to disembowel the thermostat so I decided to use the Pour-N-Go formula. Both formulas require an engine that will idle for 50 minutes without overheating. (I did a test idle on my engine and the temp held steady without significant coolant loss for more than an hour).

I ordered the BLUE DEVIL Pour-N-Go from Advance Auto, they sell a 32 oz. bottle for about $60 (the website shows the Mechanic Formula but they actually sell the Pour-N-Go). I could only find the Mechanic formula locally.

I put it in last night and after the required 50 minute idle, let it sit until this morning (with no radiator cap on the DII, I removed the top hose drained enough coolant and poured the BLUE DEVIL into the radiator through the top hose). I have driven it around all day, up to an hour at a time and so far, knock on wood, there isn't a drip present anywhere! Dry as a bone. The temperature gauge reads just below mid-line and the truck runs great. It is still early and I will give it more of a test this weekend, but for now it looks like it took care of the head gasket leak and may have saved me $$$. This will likely not work for all head gasket leaks, but for smaller, external leaks, it might be the answer.

Phil
1999 DI
2000 DII BLUE DEVIL Guinea Pig
2001 DII

Originally Posted by Cedes

I am about to put Rear Main Sealer into the Renault and Hyandai. Bad leaks coming from both. Blue Devil is guaranteed to be a permanent fix. Pretty amazing stuff, in my experience using it.

Originally Posted by adolfojbonilla

Please keep us posted, thinking about pouring a bottle to try and fix a rear main seal on my 2002 Discovery S2 SE.