Exhaust Manifold Water Plug |
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1998Nautique ![]() Senior Member ![]() Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
![]() ![]() ![]() ![]() ![]() Posted: April-30-2006 at 11:42pm |
I went to put my plugs back in, and the one has a bunch of crap in the threads, and th eplug will hardly go in. Do I have to re-cut the threads.
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skyhawkflyer ![]() Senior Member ![]() Joined: February-08-2005 Location: Zimbabwe Status: Offline Points: 275 |
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I bumped into a few of those situations myself. You can do a couple of things. Try cleaning up the threads with a wire brush. If that doesn't get you where you need to go then take a sharp pick (like a small ice pick) and work it around the threads scraping out the buildup, then clean with a wire brush, and spray with oil. If the plug looks damaged you can always replace it. Heating it up with a torch will also break the buildup loose, but you need to get it to turn color for it work. The expansion breaks the crud loose. All of this is for the plug, not the block or manifold. You can buy small round wire brushes from tool stores along with small picks bent at 90 degrees that will work for the block or manifold, use no heat.
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David F ![]() Platinum Member ![]() Joined: June-11-2004 Location: United States Status: Offline Points: 1770 |
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Easiest solution would be to go to your local home supply store (i.e. Home Depot). Head to the plumbing department and buy a new galvanized plug. They are just standard (3/4", I believe) pipe plugs.
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79nautique ![]() Grand Poobah ![]() ![]() Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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You should be using brass not galvanized plugs will corrode(sp), rust and fall apart lead to your problem.
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David F ![]() Platinum Member ![]() Joined: June-11-2004 Location: United States Status: Offline Points: 1770 |
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Yes, that is true, but it takes many years and are inspected each year. Both my boats had/have galvanized plugs. One from the factory. One replaced by me. The engine block drains have brass plugs.
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1998Nautique ![]() Senior Member ![]() Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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My Plugs are brass. It is where they screw into is full up crap. So I have to clean the threads out.
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JEFF KOSTIS ![]() Gold Member ![]() Joined: April-19-2005 Location: United States Status: Offline Points: 817 |
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A copper pipe cleaning wirebrush works well just by cutting the handle off and putting it in a drill. Purchasing a pipe tap and chasing the threads works well if all else fails.
Jeff... |
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1998Nautique ![]() Senior Member ![]() Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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I would need a 3/4 in pipe tap. Where do I get one, if nothing else works?
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David F ![]() Platinum Member ![]() Joined: June-11-2004 Location: United States Status: Offline Points: 1770 |
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Home Depot has them, they are $16.99
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JEFF KOSTIS ![]() Gold Member ![]() Joined: April-19-2005 Location: United States Status: Offline Points: 817 |
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I cant remember off the top of my head, but do you have to take the riser off to get the tap to fit???
Jeff.... |
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1998Nautique ![]() Senior Member ![]() Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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Jeff,
What is the riser? |
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David F ![]() Platinum Member ![]() Joined: June-11-2004 Location: United States Status: Offline Points: 1770 |
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Jeff:
Excellent observation and yes, I think you are correct. The riser is the elbow on top of the exhaust manifold or the part that the exhaust hose clamps to. So, you will need to purchase a new gasket before you remove yours (if you go the tap route). Just note the orientation of the gasket as it can be installed two ways, and one way is wrong. |
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79nautique ![]() Grand Poobah ![]() ![]() Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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pipe tap's are usually pretty short and you might be able to tap the manifold without removing the riser. Just use an adjustable wrench instead of a t-handle on the tap
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skyhawkflyer ![]() Senior Member ![]() Joined: February-08-2005 Location: Zimbabwe Status: Offline Points: 275 |
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Try cleaning the threads as noted above. 15 minutes spent cleaning it up might save you the hassle of taking it apart and buying a tap. If it doesn't work-go shopping!
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1998Nautique ![]() Senior Member ![]() Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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What kinda of oil should you put in the hole?
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David F ![]() Platinum Member ![]() Joined: June-11-2004 Location: United States Status: Offline Points: 1770 |
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Ideally, cutting oil. But, any oil will do just fine because you will be going slow. In fact for simple thread cleaning, I do not even bother with oil at all...depends on how bad the threads really are.
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1998Nautique ![]() Senior Member ![]() Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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Do I try and chip out the hard stuff? I will need it to break loose.
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JEFF KOSTIS ![]() Gold Member ![]() Joined: April-19-2005 Location: United States Status: Offline Points: 817 |
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Personally, I would not use oil, and run the tap in easy until it feels resistance, remove the tap, and flush the hole with water to remove the debris. Do this several times as going "one shot" might cause the debris to roll or gall the threads.
Jeff... |
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GottaSki ![]() Grand Poobah ![]() Joined: April-21-2005 Location: NE CT Status: Offline Points: 3337 |
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Using a cutoff wheel, one can make a cheap cleaning tap by cutting a groove square to the threads on a pipe-plug, then thread with cutting oil and back off and on, little at a time and clean the groove out when neccessary.
Freshen the edge if neccessary, but it shouldn't be. I concur, brass plugs with a smear of neverseize are trouble-free. |
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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1998Nautique ![]() Senior Member ![]() Joined: January-26-2006 Location: Canada Status: Offline Points: 190 |
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Anything I can spray in the hole to loosen the crap up.
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