I bought a 1987 Marlin last summer that has a 4.3L with Cobra outdrive. Long story short, when I bought it the guy I bought it from told me he already had it out and it was lake ready. So, I promptly ran it out to lthe lake and smoked the engine... literally. The exhaust bellows cooked and put off as much smoke as a tire fire! No joke. I later figured out that TWO expansion plugs were completely out. I fixed the engine and it was running fine when I last ran it. Here's how that event applies to today's question: In the process of smoking the engine and thusly cooking the exhaust bellows, I also melted down the two valves attatched to the valve covers (I'm assuming those are PCV valves.). Althought I had those inlets plugged and covered with shop rags over the winter, it appears that water has still made its way into my oil. The oil is milky. So, here's what I plan on doing and any advice pro or con is appreciated: I am going to drain the oil and filter directly into the space below the engine and let it drain for a few days into a bucket beneath the transom drain hole. I will add a regular automotive engine flush and use according to the directions. Then, I'll replace with the proper oil... is 10W40 correct for the 4.3L? And, here's my real question... where is the dang drain plug located? The whole pan feels smooth. Would it be easier to use an oil vac to remove it? Thanks in advance for any response.
