1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 186Get this manual
Connecting Rods 1C heck connecting rods for alignment by placing rods on surface plateIf light can be se en under any portion of machined surfaces, if rod has slight wobble on plate, or if 0.002 in(0.051mm) fe eler gauge can be inserted betwe en any machined surface and surface plate, rod is bent and must be discarded2Overheating: verhe ating is visible as bluish be aring surface color that is caused by inadequate lubrication or excessive PM3Rust: Rust formation on be aring surfaces causes uneven pitting of surface(s)
5Spalling: Spalling is the loss of be aring surface, and it resembles flaking or chippingSpalling will be most evident on the thrust portion of the connecting rod in line with the "Ibe amG eneral be aring surface deterioration could be caused by or accelerated by improper lubricationaSpalling