Date registered: Mar 2005
Vehicle: '01-E320 & 02-ST2
Location: John 15:18-19
Mentioned: 0 Post(s)
Quoted: 35 Post(s)
Ummm...don't use anything on the threads of the new plugs when you install them. Bosch specifically says not to (their threads are specially coated) and it will cause you to overtighten them.
As to engine temp...there are people in both camps. I will say that a hot engine is much more difficult to work on (it's really easy to burn yourself, and the tight confines near the exhaust don't make it any easier) and people have pulled threads right out of the head with the plug because it's harder to "feel" it not breaking loose. Remember, this is an aluminium head and basically a steel threaded insert; those two metal compounds expand and contract at much different rates.
The plugs fire sequentially, so you have to get the wires back on the plugs in the exact order in which they are removed. Since I recommend that you test and inspect them, simply remove them one at a time and mark them so you can put them back in the same spot (assuming they all test okay). Pulling all of the wires and marking them will also give you lots of extra room to work.
Ultimately, proceed as you deem best, but do so with extreme caution. Pulling a head so it can have a thread insert installed is something no one should ever have to do, at least IMHO.
Good luck, carfo.
Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)