Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 255Get this manual
POWERHEAD
End Bearing Bleed System
1Check rubber bleed hosesReplace any hose that is cracked, cut or deteriorating2Check operation of lower end cap check valveIf valve is working properly, air can be drawn thru check valve "one way" onlyIf air can pass thru check valve both ways, valve is not working properly and must be replaced
Connecting Rods
1Check connecting rods for alignment by placing rods on surface plateIf light can be seen under any portion of machined surfaces, if rod has slight wobble on plate, or if 0.002 in(0.051 mm) feeler gauge can be inserted between any machined surface and surface plate, rod is bent and must be discarded2Overheating: Overheating is visible as bluish bearing surface color that is caused by inadequate lubrication or excessive RPM3Rust: Rust formation on bearing surfaces causes uneven pitting of surface(s)aPitting