once you get the engine covers off, the 325 engine and your 525 should look the same, get the frt pulley off by removing the 6 13mm headed bolts and the pulley will come off. There is a notch on the engine housing to line up with the crank belt pulley, check everything 2x and then rotate the engine by hand several time to make double sure. The crank pulley/ harmonic balamcer also has a mark to line up with the mark on the frt engine cover(just like the 325 )