STEP 7 - cleaning up
You need to clean the mating surfaces of the manifold and the engine otherwise the new gasket may not seal. I used an old rag (cut up t-shirt), a tooth brush and some white spirit. There was also some stuck on debris on mine in a couple of places - so I gently used some emery paper.
Here you can see the left side of the picture with the clean mating surface, compared to the right side of the picture - uncleaned:
You will also need to clean the 'grooves' in the manifold - again to make sure the new gasket seals. A brush is best for this.
STEP 8 - fitting new gasket
The new gasket you will need is the modified version - green in colour. MG Rover part number: LKJ101110SLP
Unlike the old gasket, the new green one doesn't matter which way round it goes, both sides are the same. As long as you line up the rubber 'lugs' at the bottom into the appropriate grooves on the manifold then you cant go wrong.
Start of at one end gently pushing the new gasket into the groove in the manifold, it will seem easy at first but once its round 1 port it will start to require a bit of persausion and stretching to fit. I worked my way round from top then round the bottom. Be sure it fits nicely into the grooves in the manifold:
Once you have done this, double check that there is no grit, dirt or foreign objects on the mating surface. Now you can now slowly and gently slide the manifold onto the studs.
Keep the manifold firm up against the engine untill you have got a couple of nuts in to secure it. (Pulling it away again may disturb the gasket)
Tighten the nuts and bolts of the manifold back up in sequence, starting from the middle. A torque wrench is very usefull - wants to be 25NM.
You can now re-connect everything you disconnected, remember to check all hoses are snug and circlips are tight (wouldnt want a coolant hose poping off whilst driving!) and re-check every thing again. Remember to clip the hose of the air filter back to the throttle body (dont want that coming off else the engine will suck in unfiltered air)
Im no expert at bleeding the system. But remove the bleed screw on the metal coolant pipe under the distributor and have a friend SLOWLY poor the coolant into the expansion tank. A funnel is helpfull. And make sure you have a constant flow into the tank (dont pour some in, wait to drain completely, and pour more else you can get air in system). When there is a nice flow of coolant coming out the bleed hole then nip it back up. Put the heater on full, run the engine with the cap off for a few minutes whilst squeezing hoses. Remember to put the cap back on the tank! Let the engine warm up keeping an eye on the coolant level and the temperature guage. Keep the blowers on - they should warm up nicely.