rear oil seal leaking

Im about to replace the rear oil seal on 1990 Mazda B2200 5-speed so is their a flange on the back of the crank cause someone said if there was a flange behind the crank the i would have to drop the the crank to get at the oil seal. Is that correct.

No need to drop the crank. Just pull the old seal and install the new one.

Keep in mind, you may have a groove worn into the crank by the old seal. If so, you'll want to put a repair sleeve on it. If you're not sure how bad the groove is, I would put one on anyway. Better to have it and not need it than the other way around and have to drop the transmission and do the job over again.

While the tranny is out, you might look at the input shaft seal on it too. Same rules apply.

I don't know the age of your clutch/throwout bearing/pilot bearing... but, if you don't know if they're recent, I would strongly consider replacing that pilot bearing and maybe the throwout bearing too. $15 or so is a very small insurance policy to make you don't have to go back in there before the clutch is ready for replacement.

I just did all of this on my B2600i last spring due to a failed pilot bearing. Here is a rather lengthy thread:

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When in doubt - I would change that pilot bearing! You will need a small puller for it! Get one before hand.

Thanks for the info