We use antifreeze in a 35gal tub with a 2000GPH bilge pump in the tub connected to the fake a lake. We position the tub under the exhaust and catch about 99% of the antifreeze as it circulates through the system and have a kustom(<--with a K) whiskey tango adapter to catch the dripless feed from the shaft and return it back to the tub. Run it for 3-5 minutes to make sure it's all pink coming out and done.
At Bamer, if the leak happened after the boat was put away and wasn't running, the case is probably cracked. The fluid coolers are located internal to the v-drive and when they break, you get Pepto looking transmission fluid. If you're unsure but don't see any outward signs of damage, run the engine for 1 minute either on the hose or in the water then shut down and look for fluid color changes in the oil and transmission. If everything looks good, run an additional 5 minutes and perform the same fluid check. Chocolate milk looking oil and Pepto looking transmission fluid is emulsified water in the oil. If everything looks fine following that, you should be good to go. Additionally, the Raptor exhaust manifolds we've seen with problems have not been drained. There was a subtle red line just below the expansion plugs/casting plugs/freeze plugs which turned out to be rust from corrosion of the cracked cast iron. We just had another cracked 350 show up today and we're in Southern California.
Quick heads up on interchangeable parts for cracked gm FUEL INJECTED small blocks; you cannot run a flat tappet camshaft with any marine fuel injection!!! Meaning, don't buy the incorrect long block, put everything together yourself and then wonder why the engine won't perform (ask me how we know, it's a story that happens every year). The fuel injected engines must use the specific roller camshaft ground for that particular application, their ECM fuel curve depends on it. Fortunately, the cams are usually in re-usable condition even if the rest of the engine isn't. If they are damaged though, send me a note and I'll give you the guy who re-grinds ours when needed (all to factory specifications). This means you can re-use the camshaft in another 1987 and newer engine block, of which there are literally millions available.
At Bamer, if the leak happened after the boat was put away and wasn't running, the case is probably cracked. The fluid coolers are located internal to the v-drive and when they break, you get Pepto looking transmission fluid. If you're unsure but don't see any outward signs of damage, run the engine for 1 minute either on the hose or in the water then shut down and look for fluid color changes in the oil and transmission. If everything looks good, run an additional 5 minutes and perform the same fluid check. Chocolate milk looking oil and Pepto looking transmission fluid is emulsified water in the oil. If everything looks fine following that, you should be good to go. Additionally, the Raptor exhaust manifolds we've seen with problems have not been drained. There was a subtle red line just below the expansion plugs/casting plugs/freeze plugs which turned out to be rust from corrosion of the cracked cast iron. We just had another cracked 350 show up today and we're in Southern California.
Quick heads up on interchangeable parts for cracked gm FUEL INJECTED small blocks; you cannot run a flat tappet camshaft with any marine fuel injection!!! Meaning, don't buy the incorrect long block, put everything together yourself and then wonder why the engine won't perform (ask me how we know, it's a story that happens every year). The fuel injected engines must use the specific roller camshaft ground for that particular application, their ECM fuel curve depends on it. Fortunately, the cams are usually in re-usable condition even if the rest of the engine isn't. If they are damaged though, send me a note and I'll give you the guy who re-grinds ours when needed (all to factory specifications). This means you can re-use the camshaft in another 1987 and newer engine block, of which there are literally millions available.
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