Just bought this motor in January its a 454mag 420hp. Its been running great then I noticed a lite ticking noise coming from the engine only hearing at slow speeds or idling. Then further inspection found a good amount of oil below the motor I checked the dipstick lost a quart or so. The engine still runs good, I topped off the oil and took it out Sunday didnt notice a big difference in performance, but it did seem like I used more gas then normal.
I think ur on to something Twin, everything that I can see looks dry? Must be coming from underneath I was thinkin pan gasket too. The noise is hard to discribe , Im sending it over to Craig at Offshore to see what he has to say.
I would check the oil cooler on your Lib, If it's like mine its right on the back of the motor. Mine leaked there after I had my motor out. Also sometimes the rear of the intake manifold can leak too.
The ticking noise turned out to be a leak in a exhaust manifold gasket. The leak is still a question, took it over to my guy for a quick look couldnt find the source. Needs further deeper inspection. I got a warranty so I guess I have to ship it back to the engine bulider. The sucky part is thats 3 hour haul at $4 a gallon that sucks. :angry1:
I had a very similar type of oil leak that drove me nuts trying to find. It turned out being the seal between the engine block and the oil filter adapter. It was a real pain to find and fix in the boat, but I tore it apart and replaced the seal and no more leak.