Month: February 2019

I was working on replacing the hoses and thermometers on my disco, and I could not find any data on the differences over time for the thermometers. So I’ve put together some information.

The left thermometer is the stock one that was installed in 1996 in my truck. the right is the replacement part (etc4765). The changes are that It looks like the actual heater coil got bigger, and got fins on it. so it can soak up heat faster. The closer spring diameter is thicker, wound the other way, and has less turns. There is a bypass to equalize the pressure between both sides of the thermometer, and the stamping to retain the thermometer changed a bit. The diameter is the same, and I’ve put a standard socket to show size.

The gasket is fairly normal, so I’ll skip over that.

The filler neck I had developed some weeping holes, so I re-welded it, machined it and then gave it a good shot of paint. There is a bung here that could be used to add an external temperature sensor such as a ACDelco 213-77, or 15326386. The casting lines still showed, and that spot for the temperature sensor was not flat, so in a flury of dramatic OCD-ness, I fixed them.

The actual install is fairly straight forward, and it’s located underneath the intake runner, towards the front. right of the alternator from the front of the truck. The spigot curves up and to the left.

So the fill cap on the Discovery’s really need a special wrench, which is ok because normally you don’t have to empty it that often. My truck never had a flush, since I bought it, and it had questionable service from some of the owners, it was about time. I used an adjustable wrench, the plastic radiator cap basically disintegrates. This was not a great idea.

Being that it’s 22 years old, it splits in the most annoying method possible, laterally. So I message it out with a screwdriver, a hammer and a chisel, straight into the radiator, not too bad, in that I can drain the radiator to get that out.

Atlantic British sells a brass replacement part (ERR4686B, $3.95) so after filling back in the brass with some filler rod, filing the neck down flat, and retapping the hole using a 21 x1.75mm tap and a 12 point 9/16 socket, the replacement fits in.

I did 3d print the special socket to screw the cap in this time, and installed the plug. The print is available on thingverse

In this whole process, the bottom hose broke, which is an odd design, which looks like the picture below, which was liberated from some auto parts seller who intern liberated it from the manufacturer.

I should redo it out of regular hose, but it’s only 22 bucks. It would be nice to add some features, like a coolant heater, and a drain plug. It could be made of a 45 degree copper fitting with two adapters soldered on, which would allow for a drain plug. Things left:

Things Completed:

• New Transmission
• New suspension, shocks, shock towers, etc
• New Battery off a Ford F350 diesel

Things Left:

• Steering leaks, Steering dampener, Sway bar links and hydraulic updates
• Radios inside and out (2 din upgrade, external antenna, ham and CB radios
• GPS, cameras, etc.
• Other random stuff as it decides 22 years is enough.