Which drive did you use for replacement, and does the recorder still record VCD? According to what I read on CDFreaks LiteOn Recorder forum replacement drives past LiteOn 1693 no longer record VCD, and many freeze on fast forward too. I've had 3 different 5005s of which only 1 has needed drive replacement thus far, and it was replaced with LiteOn SHM-165P6S which no longer records VCD and freezes on fast forward. I had no problems lining up screw holes, but cutting of plastic at inside top front of the 5005 was needed to get proper fit; also some trimming of plastic on the drive drawer after removing original drive drawer cover permitted fitting the 5005 cover onto the replacement drive. There are excellent instructions on the whole replacement procedure in post #8 at http://club.cdfreaks.com/f102/replacement-burner-153421/ and at http://club.cdfreaks.com/f102/shw-160p6s-lvw-5005-success-165085/ which included pictures at 1 time but pictures seem to no longer be there. I've not noticed the clock issue, but I use OTR to record mostly and rarely use timer recording and thus would likely not notice small changes in clock time.
I've since gotten a Sony DRU-120C (aka DW-G120A) drive for eventual replacement in 1 of the other 5005s because it retains fast forward function which I learned from another CDFreaks thread. I also recently got a BenQ DW1620 which is 1 of a few fully functional replacements which I learned from another forum for eventual replacement in the third 5005. In another CDFreaks thread I also learned both LiteOn SHW-160P6S and SHM-165P6S may be cross flashed to Sony DRU-120C (aka DW-G120A) if 1 wants to retain fast forward function. I don't use fast forward function since I use the 5005 only for recording and use DVD player for playing, but that function may be useful to some.