The only manual specifically for the Omega 2.5TD that I know of is in French. It doesn't go into a lot of detail, but does give some clues. If you (or anyone) wants one, let me know & I'll see if they're still available.
I've never had a major problem removing the inlet manifold - are you sure that you've removed all 12 of the nuts from the studs (including that nasty one that's almost impossible to get to on the rear cylinder)? Also, on LHD cars, there's a small bracket on the rearmost stud that holds a pipe in place - it can jam things slightly & needs to be pushed clear. The other possibility could be the bracket between the manifold & the oil filter housing - from memory there are 2 "captive" nuts & bolts down there. Apart from that, it just needs to be "juggled" off.
When reassembling I find it useful to replace the nuts using a dab of grease in a socket to stop the nuts falling out & disappearing down into the engine bay - you can spend hours looking for just one of them if you're unlucky! Don't forget to reconnect the manifold vacuum pipe - easy enough to forget because it's practically impossible to see.
Replacing the glowplugs now takes me about 3 hours from start to finish - but the 1st time it was all weekend! While you're in there I'd recommend replacing the injector leak-off pipes that daisy-chain between the injectors & the manifold-to-EGR valve actuator vacuum pipe - they're all rubber/cotton small-bore pipes that go porous after a few years & end up giving problems - they're relatively cheap & you've already done 99% of the work once you're in there. Good luck.
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Topic: How to remove inlet manifold 2.5TD/manual (Read 1304 times)