Had a small leak in the plastic thermostat housing on the LR3 and at the advice of a Rover tech, I opted to change out the entire assembly and the plastic bleeder T.
In the process, I tweaked an O ring and wound up doing it a second time, so I took pictures and figured I would post a step by step.
Here is goes, hope this helps
Remove the 4 bolts from the engine cover. 6mm and they are like 1/2 turn.
Remove the front under body metal plate to access the oil filter. I think it's 2 -13mm for the larger bolts under the engine and 2- 10mm for the smaller ones into the bumper.
This will expose the oil filter and the 2 coolant lines that fit to the filter assembly. Slide the hose clamp back on the lower line and remove the line from the housing to drain the coolant from the system. I like to use a small 90deg pick to loosen thne hose from the fitting.
Be sure to put something under the truck to catch the coolant. I used a clean plastic tub so I could filter and re use the coolant.
Keep the catch basin under during the process as you will let air in and coolant out as you go.
Next remove the air intake from the throttle body. I found it easiest to pull the flex hose and the small box as one unit so I had more to flex out and could use the rubber fitting on the air box fit some wiggle room. I think this is a 7mm.
With the band clamps loose, there is a single plastic line that comes in to the hose that needs to be removed before the hose can come out. To remove, just squeeze on the ribbed sides of the fitting and pull it off.
With the band clamps loose and the squeeze clamp line off, you can wiggle the air inlet hose off. I found it easiest to get the end off the air box first, then twist and tug to get the end of the throttle body.
Next, I started to pull all the coolant hoses off the thermostat assembly, the egr, and the bleeder T. I like to use channel locks and slide the clamps past the fitting and leave then on the hoses.
I found it easiest to also remove the upper radiator hose so I could bend the whole hose out of the way.
With most of the hoses pulled, you will need to remove the throttle body. It has 4- 8mm bolts that are all the same size. I found it easiest to pull the electrical connector before I removed the bolts, just squeeze the flat spot and pull. Keep an eye for the thin metal gasket that you want to make sure comes with it.
I left the small coolant line attached to the throttle body and folded it all out if the way.
Next, I pulled the clip that holds the temp sensor and removed the temp sensor just to get it out of the way. The new assembly comes with a new temp sensor, but it have me a little more space and makes it easier to see one of the housing front bolts, so I pulled it out.
Next, you will need to separate the small exhaust line from the egr valve. There are 2- 10mm bolts the come thru the exhaust line flange into the valve. I used a 10mm gear type box wrench and it worked great. Keep track of the bolts or you will be fishing with a magnet. Also keep track of the metal gasket that is between the flange and valve.
Next you will need to remove the 4- 8mm bolts that hold the rest of the intake duct to the main black plenum on the top of the motor. This is the hardest set of bolts to get to. You can cheat by pulling the front half of the thermostat assembly, but I learned the hard way that you can't re assemble it the same way without tweaking the O ring, so I suggest you pull the bolts with the assembly in place so you can see how you will need to get the bolts back in.
I used a combination of different length 3/8" socket extensions and the 6" wobble style was the bollucks. It takes a bit of creativity, but you can get in and get to all 4. The passenger side are much easier than the driver side.
The bottom right (facing the motor) bolt is the hardest to get to. It is tucked behind the small exhaust feed to the egr and hard to even see. To get some extra working room, I loosened the bolt that holds the metal coolant line that runs across the front of the engine. You only need a few turns to let the pipe move and get the line out of the way to fit the socket and extension thru the space to get to the bolt.
After you get the 4 bolts out, celebrate with a cold beverage as this was a pain in the ass. If you drop and parts in the process, you may want to get one of these magnets with a cool led flashlight tip from Lowe's. I was thankful for an aluminum block.
It looks like the ap won't let me upload more pics from my phone. I will take a break and come back to finish up.