it may look and work well on land then blow up on the water. If the engine is going to break, it's going to do so on the water after being run at high speed under a load and in high stress conditions. It only would have cut out when enough water got into the oil to completely flood the engine.Įven if you don't see signs of water, pressure test the cooling system and do a leakdown test on the cylinders to see if there's a problem, otherwise you may end up out on the lake with no engine and damage to your boat you could have avoided. I had a 305 (MC 228) engine that ran when it was half full of water. Having the engine run well means very little. If you popped the plugs, odds are good you also have an engine crack somewhere, and finding and fixing that could save you a couple thousand dollars over ignoring it. More importantly, pressure test your engine water passages before you go out on the water. Put a little bit of RTV silicone gasket sealant on the edges before you tap them into place with a dowel (I use permatex). Several kits are offered with every plug you need for a large variety of applications. The right thing to do is replace them with standard brass plugs. JEGS Brass Freeze Plug Kits resist corrosion better than standard steel plugs, help protect against cracks caused by the pressure of frozen coolant and in regular operation, will ensure that all vital fluids stay in the engine. Main Caps, Studs, Bolts, Freeze Plugs Hot Heads. I don't know how you'd diagnose a 5.0 marine engine that'd froze. Brass cup-style freeze plugs for non-stepped freeze plug holes. If you had a closed cooling system, like a car, you could be looking for bubbles in the coolant. It also takes a tall hoist to get the engine over the side of the boat. You've just got to have the tool to align the outdrive with the motor. Pulling an inboard-outboard engine is not really that hard of a job. I personally would probably pull the engine and fix it right if you cannot replace the brass plugs due to a lack of space. I'm not familiar with the rubber replacement plugs-and if using them will work. You might could pierce the brass plugs if you had room to get a hammer in there. I don't have any idea of the space you're working in. Mercury said that seldom does a customer wear out a car based engine-that the vast majority of replacement engines is due to freezing. The metallurgy and motor mounts are different on marine engines. Mercury and other boat manufacturers only rent out the GM engine factory something like one per year to cast engines to their specifications. I had to wait over 6 months for an engine, as Mercury didn't have any engines warehoused. Products can be manufactured in most metallic and non-metallic materials, even hard to find materials.One time I had to replace a Mercruiser short block due to a bad head gasket-pitting the space between cylinders. View metallic material characteristic informationĭid you know?Seastrom has extensive custom capabilities in Precision Stamping, CNC Machining, Multi-Spindle Screw Machining, Four-Slide, Water Jet & Laser Part Marking to meet all your requirements. View our material & finish specification sheets If you need additional information on your particular dome expansion plug application click on one of the links below: If you require a different material, finish or size, please submit a quote. Not all available materials or finishes are listed in our catalog for every part number.
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