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U have bent the valves ..........when the belt broke......... i presume u have timed the engine properly, u could do a compression check to make sure,........ but sounds like a new head is nessary or take to garage very extensive job will cost a lot
you have the n62 engine in this x5 valve guide seals are leaking causing the blue smoke but i hate to tell you people havnt had much luck with repair in fact i am replacing the cylinder heads on a 750 with the same engine right now after an attempt to replace the valve guide seals failed to resolve the problem
it is more than just the valve seals.the 3.0l engine is notorius for the valve guides slipping down into the valve pocket. there is a fix that involves adding a keeper to prevent them from falling but it requires removing heades and taking them apart. yours may have already have had this done so valve seals may fix it.
yes you can change without removing heads you need to have piston at the very top off stroke if off by a little the piston will be forced down by the air pressure so somehow locking crankshaft from moving would be a good idea.
remove plug from a cyl and fashion or buy a fitting to screw into plug hole that will also hook up to a air hose from a air compressor. the air pressure holds the valve closed then you will meed a valve spring compressor designed for removing the springs with head still installed. can rent them at auto parts stores.remove spring and replace seal. then reassemble and move on to the next
but sometimes the valve opens or piston moves down and the valve falls into the cylinder. you can pull it back up and try again or just take the heads off.
my recomendation is just take the heads off they are fairly easy to remove and instal. then have machine shop cut the grooves in the guides and install keeper clips
You have what is known as a valve guide or valve guide seal problem. as the car sits, the residual oil in the valve cover is seeping into the cylinders through a faulty seal or excessive clearance of the valve guides and is now sitting on top of the pistons, so when you start the car. it burns and goes out the tailpipe. Id recommend you take your car to a certified engine repair facility to have it checked for repair. "Valve guide seal" replacement can be done without too much headache . If the "valve guides" need to be replaced, then the cylinder head/heads must be removed. and this is a lot more costly.
Fresh bore on cylinder (if it can be bored), see note
Possibly valves, valve guides and valve seals, see note
Miscellaneous seals and gaskets
NOTE; some cylinders are nickle plated and can not be bored unless re-plated. If cylinder is beyond repair then replace it. The valves should be re-seated. If any dishing or valve stretch is present, the bad valves must be replaced. Valve guides seldom need replaced but valve guide seals could be bad. If the bike gives a puff of white smoke when started after sitting for 5 or 10 minutes then replace the seals.
You either have had the wrong valve seals installed, they are physically missing, or the valves are incorrect (too loose in the guides/stem too thin). The rocker arm seals will not contribute to your issue. If it did not have the oil smoke before you took the head off, the issue is with whatever the machine shop did. Valve seals have to fit TIGHT, or oil will go down the valve stem into the intake.
Take the head back to the machine shop & tell them to fix it. For free.