Clamp Bolt
Marine exhausts systems are an important and often overlooked part of a marine engine. Most vessels have a ‘wet’ exhaust system. Salt water is injected at the riser – the outlet for exhaust from the exhaust manifold. This mixture of exhaust gas and water is then passed through a series of bends until it exits the boat, preferably at the stern.
Exhaust gases mixed with salt water create a highly corrosive compound. This is why exhaust systems are commonly made using non-corrosive components such as nitrile rubber reinforced hose (brown – not green – stripe), galvanized steel, fiberglass or plastic. The purpose of these components, which vary in size and shape depending on the engine size and layout of the engine room, is to prevent hydraulicing of the engine. This is caused when an engine has filled with salt water which has entered via the exhaust and can cause extensive damage if left for more than two hours. Water enters the exhaust from wave action at stern and poor exhaust design. In some ocean conditions, such as a following sea, water can be forced back up the exhaust when the engine is not running. Poorly designed exhausts allow water to flow back and fill the waterlock/muffler box then up the hose into the exhaust manifold, through the exhaust valves and into the combustion chamber. With the engine full of water the engine cannot crank over as it is cannot compress water.
You will know your engine is hydrauliced if it will not turn over – generally after a long sailing period – and you have removed the starter motor and ensured it works. To remove water from inside the combustion chambers, first remove all injectors, crank engine over to blow water out, refit injectors, bleed injector lines, and start. Then leave motor running until exhaust sorted out.
Check to see that the riser is not coked up or corroded – a common problem. To check the exhaust riser remove the exhaust hose from the riser (often a difficult procedure) and look up the pipe to see if it is restricted by exhaust/salt build up. If build up is excessive the riser will have to be removed to check the engine end of the pipe. Coke can be scraped out to provide a short term fix although often the riser will have to be replaced. There are aftermarket systems which vary in quality. Make sure you fit the right design for the application.
Ensure your water-lock is low enough and big enough to hold all the water in exhaust system. Is there a gooseneck or central vertical loop in the exhaust hose at the transom exit? Is there a siphon break and is it functioning properly – no leaking valves?
Exhaust gas is poisonous and can cause sea sickness and headaches. Replace any faulty parts immediately. Use double hose clamps on each joint or, preferably, super clamps, bolt style, and exhaust cement if need be. Hot sections should be lagged with fiberglass tape to prevent burns.
Beware of asbestos lagging. Many older vessels and marine engine installations had exhaust systems that were lagged with asbestos tape and rope. Asbestos sound-proofing was also common in older boats.
About the Author:
Chris Miley is an online author and a keen boater. He maintains the website
Marine Diesel Secrets
and the
Pontoon Boat Site
.
Article Source: ArticlesBase.com – Marine Exhaust Systems – How They Work
8 Clamp Bolt
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Northern Industrial Stainless Steel Hose Clamps – 34-Pc. Set $7.00 Pack of 34 worm gear hose clamps in eight popular sizes, 1 1/16in. through 2 3/4in.. You get four 1 1/16in. size, six each of 1 1/4in., 1 1/2in. and 1 3/4in., four each of 2in. and 2 1/4in., and 2 each of 2 1/2in. and 2 3/4in. sizes…. |
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K&M Table Clamp $14.99 The K&M Table Clamp has a 5/8" threaded bolt for holding goosenecks. Clamp adjusts to 1.7". |
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Top Clamp $192.99 Top Clamp from Pro-Tek CNC machined from 6061 T-6 billet aerospace aluminum Comes complete with top-drawer stainless polished hardware Triple-chrome-plated for show look Direct bolt-on for models listed |
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Replacement Mounting Clamp for Skid Plate $7.95 Moose Racing Replacement Mounting Clamp for Skid Plate Replacement Mounting Clamp for Skid Plate from Moose Racing Diameter of frame tube is stamped into clamp Sold each Includes bolt and washer |
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Triple Clamp Upper Kit $289.95 Pro Taper Triple Clamp Upper Kit One clamp for all applications Cold-forged then Machined from 6061 T6 aluminum; Much stronger than billet Cold-Forged bar clamps with one piece accu-trax top clamp to resist ldquo;twisting rdquo; 5 front to back bar clamp positions Completely re-designed rubber mount system includes 3 durometers of cushions soft medium firm and aluminum rigid mount cushion replacements True bolt on. No special tools or presses required Click Here For Triple Clamp Complete Kit |
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Gibraltar Adjustable Right Angle Clamp $29.99 The Gilbraltar Adjustable Right Angle Clamp allows multiple angle adjustments with a geared drum key/bolt assembly. Compatible with Road Series racks. |
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Gibraltar Adjustable Right Angle Clamp $29.99 The Gilbraltar Adjustable Right Angle Clamp allows multiple angle adjustments with a geared drum key/bolt assembly. Compatible with Road Series racks. |
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The Light Source Mini Clamp Polished $6.99 The Mini-Clamp is perfect for PAR 38's, pinspots, and other small fixtures. The clamp is made from an aircraft-grade aluminum extrusion with micro-grooves that conform to the pipe for real gripping power. The Mini-Clamp will grip from 3/4" to 2" tubing. The pipe bolt is 3/8"-16 TPI with a 2" black plastic knob. It's yoke bolt is a 3/8"-16 TPI at 3/4" long. Despite the fact that the Mini-Clamp weighs less than 6oz., the safe vertical weight load is 150 pounds. |
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The Light Source Mini Clamp Black $6.99 The Mini-Clamp is perfect for PAR 38's, pinspots, and other small fixtures. The clamp is made from an aircraft-grade aluminum extrusion with micro-grooves that conform to the pipe for real gripping power. The Mini-Clamp will grip from 3/4" to 2" tubing. The pipe bolt is 3/8"-16 TPI with a 2" black plastic knob. It's yoke bolt is a 3/8"-16 TPI at 3/4" long. Despite the fact that the Mini-Clamp weighs less than 6oz., the safe vertical weight load is 150 pounds. |
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Gibraltar Adjustable Right Angle Clamp $34.99 The adjustable SC-GRSAR right-angle clamp allows for multi-angle tube adjustments for Gibraltar Road Series (GRS) racks. It allows multiple angle adjustments via a geared drum key rod/bolt assembly. |
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Gibraltar Adjustable Right Angle Clamp $34.99 The adjustable SC-GRSAR right-angle clamp allows for multi-angle tube adjustments for Gibraltar Road Series (GRS) racks. It allows multiple angle adjustments via a geared drum key rod/bolt assembly. |
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Triple Clamp Complete Kit $439.99 Pro Taper Triple Clamp Complete Kit One clamp for all applications Cold-forged then Machined from 6061 T6 aluminum; Much stronger than billet Cold-Forged bar clamps with one piece accu-trax top clamp to resist ldquo;twisting rdquo; 5 front to back bar clamp positions Completely re-designed rubber mount system includes 3 durometers of cushions soft medium firm and aluminum rigid mount cushion replacements Complete kits feature the upper kit along with a fully assembled lower tripleclamp that includes stem lower bearing and seal and stem hardware True bolt on. No special tools or presses required Complete kit also includes a trick two piece number plate mounted brake line guide *Note: Bar Mounts Will only fit 1-1 8 Oversized handlebars. Click Here For Triple Clamp Upper Kit Click Here For Pit Bike Triple Clamp Complete Kit |
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Sound Percussion SPC23 Micro Cymbal Arm Clamp $24.99 The attachment features a 10.5mm adjustable eye-bolt clamp with an L-rod cymbal arm on one end and a grabber clamp on the other. Attaches to any 1/2" to 1-1/2"-diameter tube. |