2006 Johnson SD 30 HP 4 Stroke Outboards Service Manual, PN 5006592, Page 133Get this manual
POWERHEAD TIMING CHAIN AND TENSIONER Turn the crankshaft in its normal running direction until the No.1 cylinder reaches top dead centerThe No.1 cylinder will be at top dead center when the match mark on the crankshaft is aligned with the match mark on the crankcaseRemove the bolt, the washer, the spacer, and the timing chain tensionerRemove two (2) bolts and the timing chain guide
4 21Bolt 2Timing chain tensioner 3Bolts (2) 4Timing chain guide