Marine Valve Stem

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Marine Valve Stem
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Do you have a gasoline-guzzler on your hands? Below are a few general reasons why engine burns oil:

It has Bad Valve Seats

Valves are located above the combustion chamber in the cylinder head. The valve-train is lubricated by pumping oil at 50 - 80 psi of pressure into the top of the head. Oil seals (usually round) are placed at the top of the valves to stop the flow of oil down into the engine when the valve is open. When the oil seal fails, more oil than is needed will flow down into the combustion chamber and get burned. This is where you will see smoke coming out from your exhaust.

The Valve Guides are worn out.

The valves are guided by small cylindrical chambers called valve guides. Regular usage causes wear and tear along the slop in the guides, and the excess gap allows the flow of oil down the valve stem into the combustion chamber to be burned. In this case, the gap is too great for the valve seal to stop the oil flow. It will have more gap over a period of usage.

Blow-by from Worn Piston Rings

Pistons in the car engine have seals around them in the form of rings for two purposes:

1. To seal the combustion chamber so that the power developed from the firing of the cylinder is not lost.

2. To provide vital lubrication to the cylinder walls.

When the rings wear out, pressure from the combustion reverses down into the oil pan, pressurizing it, and forcing oil into the valve covers, through the breather system, back into the fuel delivery system, and into the engine to be burned.

Prevention techniques

Always keep your car's oil filter and air filter changed regularly to minimize sludge formation and carbon build-up down to a minimum. While you can't stop mechanical wear, proper care and maintenance will slow it down, saving you thousands of money for a better fuel consumption. The way you drive by not revving the car to 6,000 rpm (revs per minute) and above at all times will prolong engine life.

Car related issues and information William's automotive blog.

William C has been in the automotive industry since 1995 and brings with him vast experience, practical solutions and layman issues on cars and related Automotive Issues. Often referred as the "car man" among his peers. He offers defensive driving techniques and safety driving on a one to one basis. Consultant by emails on driving ways and sorts. Look for him for good repair shops and money saving insider secrets.

William's Car Issues William's automotive blog.

Commercial Components, but not Commercial?

Not too long ago Rancilio Silvia had an upgraded version. Now, these features are standard. The upgrades include an ergonomic commercial 58 mm diameter heavy chrome plated portafilter, a commercial articulating steam wand and a redesigned commercial quality contoured steam knob.  

As some of you know, this machine has been the most highly recommended semi-automatic espresso machine for at least four years. Heat retention is now assured by its chromed forged marine brass brewing head, brass line and 12 ounce brass boiler. This size boiler gives a greater steam capacity that is closer to being commercial as it has a quick recycle time for more espressos. The machine is housed in brushed stainless steel with an iron frame that offers the modern stainless steel look with a durable foundation. The three-way solenoid valve is another commercial feature because it relieves the water pressure off the coffee when the brew switch is turned off. This action dries out the coffee to prevent dripping into the portafilter, thus making it easier to empty the portafilter with one knock. The switches on the Silvia are the same as those on Rancilio's commercial units. All four are snap-action rocker arm switches.

Is it commercial yet?

First, you should use a commercial or top grade coffee. E-commerce shops and stores offer this grade of espresso coffees for a large variety of tastes. Second, you need to get a high grade grinder; one that will handle a consistent size of grinds for the Silvia.

Because the portafilter's filter holder is large and chrome plated brass the water is distributed evenly over the entire area of its filter area and the temperature remains constant throughout the brewing process. The main power switch is located by itself in the center and turns on the heating element. When the adjoining orange light goes off, the machine is at operating temperature. The top left is the brew switch that operates the pump. Turn this on to brew and turn off when the brewing is done. The next switch down is the second switch turns on the hot water on. The bottom left activates the steam function and the boiler will heat the water to steam temperature. Next, turn the steam/water knob located on the side and start frothing. The steam wand now allows a greater amount of motion for easier use.  Remember, before you start this process to preheat your cups. This is very important. Your Silvia has a cup warming area on the top of the machine.

Another feature offers hot water. Just turn on the brew switch and open the stem knob and steaming hot water will come out. This is great for hot chocolate, tea, or Americano, water added to espresso on the bottom. When making tea, be sure the water is not boiling. It is best to put the hot water in a pitcher and then pour it over the tea. Tea tastes best when the water is about 180 to 190 degrees.

Well, there is still one more optional feature. The Silvia is also Easy Serve Espresso pod-adaptable. This allows you to install a pod-adapter kit for ESE pods. These pods offer a variety of coffees for a one time use. This option needs to be taken off for better regular espresso use.

Is the Rancilio Silvia a commercial espresso machine? The answer remains with the user. The Silvia will do all the things a commercial unit does, but is it designed to be run on a continual basis day after day? Are the daily cleaning requirements the same as a commercial unit?  Routine cleaning should include descaling every 2 - 3 months.

Clean the brew gasket with a cleaning brush after each daily use.  Clean out the water tank and drip tray every few days with continuous use. Clean the filter basket each week. Your user's manual will give you more detailed information on cleaning. Whatever you decide, the Silvia remains top in her class of espresso machines for the home.

About the Author

Joyce Kaaland is the owner of Coffeemakersshop.com and is very knowledgeable about commercial coffeemakers having worked with churches on appliance choices for there commercial kitchens. She has written information on how to take care of coffeemakers, espresso machines and why one year warranties are not a bad thing on her blog site:  http//.www.todayscoffeeblog.com. Espresso machines

bent exhaust valve?

Chev 350 in marine use. Made horiffic exhaust noise, especially with increasing throttle. Cam seems fine still, but the rocker on #5 exhaust was somewhat off to the side but still touching the side of the valve stem...but stem bent. What would cause this and is this the cause of the loud combustion sound (like a spark plug out of it's hole"?

You have several problems here! First of all lets dispense with the marine part, -- which is mostly cooling system conversion! A bent valve -- probably reason for popping, - it is most likely bent inside from striking (being struck) by piston with some possible small piece of metal between top and valve, -- this could be a simple as a piece of broken piston ring, or maybe a screw or nut that has fallen down in intake system some time,- and just now "sucked" into combustion chamber! Clearance between piston and head not really large when piston all the way up!

In order to repair, you need to remove the head and have valve taken out, -- which will probaly require new valve guide replacement! As for rocker arm, it may or may not be involved in actual origional problem! I would have head all checked over to make sure that it is ok,-- as foreign objects inside engine can ruin head also! Now if this is a high time engine, It might be a good idea to pull other head off also, as you have to remove stuff on top and intake manifold to get other one off again, -- (if it has problems later)!

The loud noises may have been piston still banging on valve, -or exhaust gasses popping out when ingniton occoured because of valve not seating, -- you could also have bent intake valve, just not as bad, -- and gas popping back out through intake system also!

Creation groans
All of us are, no doubt, aware of the devastating oil disaster that is unfolding in the Gulf of Mexico. Depending on whom you believe, some 5,000 to 19,000 barrels of oil are presently spewed into the Gulf waters every single day.

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