The Aerofish
New member
Recently purchased a 1981 StarCraft with a 2.5 120 hp Mercruiser. The motor had a good knock to it so ended up tearing it down. Cam bearings are exceptionally wore but also noticed the cam “rocking” back and forth. The cylinders all checked out at 160-165 psi. No visible signs of crank or rod bearing wear. Just the cam bearings. Lifters and pushrods all look good visibly, but maybe some minor wear on bottom of lifters. My current plan is to replaced the cam bearings, cam, lifters and pushrods just to rule anything out. Also while I’be got the motor tore down, was going to replace crank and rod bearings as well. Does anyone have any thoughts on what may be going on?