Change the main engine of the boat sounds like a great project. Crane plans, guidance, choosing the right machine, everything seems overwhelming to the sailors. In fact, for the DIY Changing a main engine of a boat is relatively simple. You do not learn any special skills of a mechanic master, why build it again, or even work on a diesel engine.
It 'simply a matter of removing the old engine, rebuilding the engine mounting rails, and then screwing thenew engine in place. It may sound complicated, but it's really very simple. DIY often last more than three months to install their engines. I have a system down where you can change a main engine in a single week contours developed. The week of engine change means that the boat, and often the living room of the family is slaughtered only for 7 days.
Step 1-Buy New NOT REBUILDING!
This is a very important point. Boat owners often look worn, leaking, enginewe want a reconstruction of the old reliable "friend." Unfortunately, the numbers do not add up. Keep in mind that a job rebuilding typically cost about half the price of a new engine. Most conversions only a guarantee in the short term and local. In other words, head for the islands and if complications occur, the local mechanic that the engine will be back in the shop or marine engine rebuilt for the service.
I'm engines all the time on the track of cruise altitude, have 500 hoursafter a new reconstruction. You are burning oil and bubbles leaving the owner back to the starting point. In addition, the estimate is that only the cost of rebuilding the block. The old heat exchangers, oil coolers, transmission, alternator and expensive fuel injection pump, 5,000 original hours on it. Rebuild all add-ons and your on your way to the cost of a new engine.
Measure before you pull the old engine
Questions, Yacht many "DIY" ownersTo change an engine and will be the main critical points:
1 How to measure for the new engine.
2 How to move the new engine.
3 How to make a perfect alignment.
Let's start with how to measure. This semi-simple process takes about two hours and will be explained below.
The measure
The measurement technique is to change the heart of an engine. The first thing you need to do is find the existing height of the motor down the existing flexibleMotor bearings. To do this they have a flat edge and place it over the beds engine. To compete with this straight line from the bottom of the bed-line engine crankshaft.
This is the first important figure. This is the line of the front propeller shaft progressed. If the transmission has an offset, or a drop, add or subtract the number to your final measurement. Now, the drawings for the new engine and find the distance from the center of the crank, the engine beds. Add tooffset if all the transmission and you should now have two separate measurements. The difference between them is the thick make-up is necessary, reduce or cut out of the brackets to the new engine will get you in shape.
Now you know a simple,
Oddly, after changing many engine with this system, I have a double engine, which came to be lowered. For some reason, will have to collect all the 10mm to 50mm. The difference between the old and the new engine is the importantMeasure. If you are so right, you can "adjust guidance" pre-made before removing the old engine. Remove the old motor, screw a piece of steel prefabricated rail (about the height difference), and put the new engine in place.
Often, two inches is the magic number, if you're lucky and new engine bearings are exactly two inches in height, then buy a piece of two by four extruded steel or 5 mm thick. Enter the new track directly over the old engine beds, than to define, and makethe new engine in place. Sometimes I take him to the extrusion of a store and cut and welded to the particular strength that I need. In both cases, make this special, all-important regular-to-rail, before picking up the old engine.
Tip While the old engine, is the perfect time to make the color of the engine compartment, and perhaps the service bilge pipes or anything else that runs under the engine. Tip 2 Consider installing a series of lights that illuminate from below the engine. Your new enginewill be very clean and nothing really helps to clean a site as good lighting.
Price Saver
It can often be a little 'to do it yourself to save measurement, while the heavy lifting themselves. Once this is called your mechanic to do the alignment and control. This can win is a win / for all. The local mechanic and get some work captures the fundamental error, while the owner is worth the hard work has been completed and the light still does not workitself.
The rest of the Fit
They have width, height and depth of the new engine fitted with the measurement of the engine, but most modern engines are much smaller than 20-year-old diesel engine will be removed. The only time that size is a problem if you remove a small motor and replaced by a much larger model. The popular Perkins 4-108 is now managed by a Yanmar that about 2/3rds the size of the original is replaced. The Yanmar 56hp is about the same size as Perkins4-108, almost half do not necessarily reflect the PS.
The repeal of the old engine
The repeal and removal of the old engine is the next step of what some yourselfers will find it overwhelming. I almost always get funding from the drops of the main arm. I enclose a block and tackle to the lifting point and then the bitter end of a winch. I use a crane to set the engine on the land bridge, then take over me with a cherry-picker. I always use two lifting points on every aspect of the lift. Ifeach line were to break the engine would not fall. The lifting cables are tail with the two largest winches on the boat.
The crane lifts the engine on the boat deck. Unless you trust your crane operator, it is often better to move through the engine block and the rest of the way for the new engine beds, in which the movement can be precisely controlled.
Lifting the engine with the rig boat. Pay particular attention to the connection between the goose neck or armand the mast. As long as your arm on the midline of the boat, the load should be under pressure, or push the tree. The problem may occur when you try to swing the arm side. The load on the gooseneck is transformed into a compressive load on the page. Examine the swan neck carefully and keep the load line with the tree as possible.
Gas connections
A common challenge with a new engine is a limitation direction to the injection pump. AtopPush-pull may be, or otherwise moves the gas now be reversed. We can choose to get used to his new bond throttle, or we can build a reverse throttle. The reverse should not be taken lightly. Engine control system must be 100% reliable. If the connection of the accelerator during the docking results have not been in an accident expensive. For this reason, you take the time and build on all shift / throttle linkage. Notice in the photo we used four mm dishLockTight and red on the reverse of all the screws.
Occasionally you can pay to another vessel to pull the engine, but this is only if the work of others must be performed, or when the propeller shaft, and perhaps should be changed. Otherwise, it's almost always easier to change the engine while the boat at the dock.
Tip: If you lift the motor side to it then consider a plastic garbage bag slips right on the floor to catch any oil drops. Note 2: Cut a piece of plywoodto cover the ground around the site. Often, the new engine comes in a wooden box that can be cut in order to use as a material to protect floors.
Engine alignment
The final alignment of the motor is often the last item on the DIY hard to think of. All measurements must be corrected? If the tree is easy to slip on the new gear? To learn a few tricks you can align the engine will save a large chunk of time and money, preventing the recovery of gears, shafts broken or wornJoints.
Remember, if your on a new engine plant, we should align the motor before making the holes for the brackets to bolt instead. Should only be used once the engine is perfectly aligned with the first mountain to be screwed. Then the alignment will be reviewed. If everything is still correct then the other lives upstream, at this point and so on, until all the supports are screwed firmly into place.
The first step to aliening an engine is to find the shaft at the center of the stern tube. I like to start(Brand 3/5ths) of the tree just above the average, as the engine mounts flexible over time by hanging the tree will remain in the middle of the stern tube. You may need to hold to keep up the tree instead. Remember, the motor shaft is inserted. Once in place the motor shaft must follow, not vice versa.
Clean both flanges with a wire brush. Insert the flange prop shaft from the gearbox. Make sure that the centering rings implementation. Enter the rotation of the flangeback and forth to ensure that fit well together. Slide a feeler gauge between the flange faces. Measure and mark the area of greatest vulnerability. Before proceeding, turn the shaft drive 180 degrees or half lap. Check the gauge readings. It should remain constant. If the readings changed since our first measurement, the wave of the flange is bent or worse. If you have a bent shaft and found more than four alignment tolerance, which then attachProblem before proceeding with the alignment.
It is often assumed the tree bent or any other aspect of the drive system is not round. This simple rotation of the wave tests confirmed the problem, or put our minds at ease. Adjust the engine mounts a bit 'at a time to bridge the gap in the flange. Keep all four groups as similar as possible. Keep checking alignment until you within.004. "At this time tighten all screws and check the alignment. Wiggle and shake theEngine as possible. For larger motors, you can have two people pushing and pulling to get the engine to move. The idea is to fix the engine on its supports. Check the alignment again and adjust the mounts that hold a gap again. Repeat this procedure until the engine is in perfect alignment.
Expect to take about six hours to make a perfect alignment of the motor. A good expert technicians can usually complete the process in about an hour. OfOf course, this means that all the screws are loose, clean and easily accessible. She points Resist the temptation to install a single support which creates a slight pressure on the opponent to pass upstream to make a small adjustment. When the rubber bearings in the engine warm, soften and fall out of alignment to start the engine vibrate.
Tip: If you find you need to change at the top of the engine and the flange, flow to measure the weight is probably compression of the stirrups and yourOrientation. If this is the case, then you have a smart way to keep the weight to the engine while the flange for the test. When I put on the engine to work to put some carpet over the engine to help easily. If you're comfortable, you can almost always do a better job.
Exhaust
To change the next step in connecting the engine exhaust system. Although this seems simple reflections in the context of the project should be done. If yournew engine has a power greater than that of the original engine exhaust its diameter as possible, should be increased. We consider this project closely. There may be more to the increase in labor costs in the exhaust system to change the engine. Often the exhaust vent at the tip of a new engine will be on the opposite side of the original. If this is the case, is a simple solution to connect to an S curve of the exhaust pipe and two elbows 45 degrees, making it easy and convenient to allow connectivityOriginal system.
Engine panel
Most new engines have a "plug and play" wiring. In other words, the installation of wiring is a simple matter of pressing the connectors supplied. However, the wiring, the engine will be fixed with clamps to prevent vibration. Where the engine wiring harness for the vibrating rigid body is a cycle of leaving extra cable, the vibrations are. The harness should be set every eight centimeters along thecomplete defeat, the panel of the motor. This may seem like a lot of points of attack, but in the coming years, all new wiring from the panel, then follow the engine harness can add up to a lot of wires.
Avoid backup water in the motor
The most common cause of damage to the engine of a ship is in salt water due to poor installation of the pipes of the cooling water.
Reduce the possibility of filling a new engine with salt waterinclude:
or put into an anti-siphon loop between the engine and drain the intake manifold
o This cycle must be at least a meter above the water line outside
o The circuit should be on the center line
o Initiation of anti-siphon loop should break, or rather an anti-siphon loop, a small tube that can be anywhere the user, such as the feed wire floor of the cockpit.
She points Resist the temptation to drain into the sink as a place to tee "trickle" anti-siphonWater. More than a new engine was ruined when the sink was clogged full of water, to wash the dishes and seal the anti-siphon loops. Remember, just because the engine will not invade in the first year does not mean that the water system is correct. It may simply mean the impeller in the rubber blocks the flow of salt water pump sea water alone. There will come a day when the impeller wears and allows water to pass through the exhaust system and fill the engine with slideseawater destructive.
Take a last look at your installation. Check for loose bolts, leaks, drips, oil in the engine and transmission, and coolant in the heat exchanger. When everything is ready, then they were ready to sea trial. Tip-When you first start you need to keep the locking lever and turn the engine with the starter until oil pressure builds. This lubricate the engine dry before you start.
Sea trials
Once the installation is finished, it's time to test. If this is indeed a newThen install the manufacturer's representative should be available to activate the warranty. Allow the engine to be open and ready access to observe the engine. Press and hold the stop button and stop the engine in a few seconds. If the oil pressure build? The engine sounds smooth? If you start it and let it idle. Check the control system of the engine and look for leaks. Follow to check the exhaust system, everything looks and feels right. Put it in low-speed driving.
If the rear of the transmissionmaking small circles on the shaft of the propeller? This is a sure sign of a bad position, bent or other transmission problem. Take the boat for a test run. If the engine reaches its maximum speed when driving the boat? This shows the propeller is the right step. When operating at higher speeds the engine is shaking and shimmy or pump and maybe for the rear? Not only are the vibrations, but a cyclical movement that does not exist when the engine is running at high speeds to a minimum? If the engine is smooth, making ato confirm the final reading in mating alignment to the final result.
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