You need to start doing Crucible Bounties. You will get 50 - 100 rep from each bounty and there are usually 2 or 3 bounties that you can complete within an hour or so. If you are a quarter of the way to rank 1 and have 164 marks I am guessing you haven't done ANY bounties since doing about 6 bounties should get you a quarter of the way to rank 1, lol.
The bounties re-supply themselves at the start of each day which is 3 or 4 am CST. I am not a big Crucible fan, but I do the Vanguard bounties (Same Concept) every day, sometimes only do 3 bounties a day and I just hit Rank 8 Vanguard so you shouldn't have a problem getting to Rank 2 within a week or maybe even faster depending on your skill lvl in Crucible.
Hope this helped, Good Luck
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Yeah I'm well known with bountys. I just don't play crucible enough to complete crucible bountys. Thanks mate. Didn't think of the bountys.