Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 194Get this manual
DIRECT FUEL INJECTION
COMPRESSOR REMOVAL
1Disconnect battery cables from battery terminals2Remove top cowlingIMPORTANT: Prior to removing flywheel cover, remove vent hose from fitting on flywheel cover3Remove flywheel cover4Use 38 inch (9.5 mm) drive on belt tensioner arm to relieve belt tensionRemove belt