I have a 2013 GM 4.3 liter (Volvo Penta 4.3GL - 190hp 2bbl carb) in a Hurricane Sundeck Sport 188 boat - with 190 original hours. It will get a valve train tap/rattle on the left side of the engine towards the front. Sounds like the left front cylinder. This correlates with a drop in oil pressure, and a fluttering of the oil pressure gauge needle. On first startup and easy running, oil pressure is strong (40 psi +). The issue generally presents itself after a 10-15 minute full throttle run, or when towing a skier/tuber for a time (engine under heavier load). It can first be noticed in the oil pressure drop (20'ish psi) and fluttering needle, then when rpm's are reduced to idle the chatter is strong, oil pressure remains about 20 psi and the gauge continues to flutter rather than hold steady like it does when the noise is not present.
This problem presented itself several years ago, but mostly went away with a switch from dino 10w40 to synthetic 10w40. Now it is doing it even after a fresh 10w40 synthetic oil change.
Could this be a collapsing lifter?
This problem presented itself several years ago, but mostly went away with a switch from dino 10w40 to synthetic 10w40. Now it is doing it even after a fresh 10w40 synthetic oil change.
Could this be a collapsing lifter?