The auxiliary winding, which is composed of a copper ring, is called a shading coil. The current in this coil delay the phase of magnetic flux in that part of the pole in order to provide a rotating magnetic field. The direction of rotation is from the unshaded side to the shaded ring. Synchronous ac motors are constant-speed electric motors and they operate in synchronism with line frequency. The speed of a synchronous motor is determined by the number of pairs of poles and is always a ratio of the line frequency.
AC Motors: Principle of Operation. Universal Motors A universal motor is a single-phase series motor, which is able to run on either alternating current ac or direct current dc and the characteristics are similar for both ac and dc.
The field windings of a series motors are connected in series with the armature windings Basic principles of Universal Motors. With two extra transfer ports cast into the sides of each of the cylinders, each cylinder is much wider.
The loopcharged V4 engine is much taller than the crossflow V4 engine. The bore spacing on a loopcharged engine is 4. The crossflow engine is 4. For identification purposes, this is also the distance between the spark plugs. Some other identification methods are: -Removable transfer port covers on the crossflow engines versus non-removable transfer port covers on the loopcharged engines.
In the V4 outboards were completely redesigned. The 60 degree V4 has very few parts that will interchange with the 90 degree V4. While a traditional outboard engine will have them mounted in front of the engine, over the crankcase, the 60 degree V4 has them mounted on the side of the engine, over the transfer ports.
A new small mechanical shift gearcase was introduced on the standard length engines. The long shaft engines use the large mechanical shift gearcase. When a marine technician encounters a V4 outboard , common sense and a basic understanding of a points style magneto or battery ignition will get them through the ignition system.
Mechanical aptitude will get a technician through the relatively simple fuel system. The gearcases on these models are very easy to rebuild as long as you remember to feed the wires through before pulling the magnets out of the electric shift gear case. In production for 29 years these are as basic as an outboard gets. Having the correct service manuals and a basic understanding of breakerless ignitions and fuel systems will get a technician through just about any problem.
One special tool is needed to rebuild the gearcase: a pinion height measuring tool. Definitely a tool to invest in! As with the crossflow engines, a service manual and a basic knowledge of breakerless ignitions and fuel systems will get a technician through most tasks. Rebuilding the mechanical shift gearcase is relatively simple with a pinion height measuring tool. Service on the newer 60 degree V4 is a little more complicated.
These engines came with carburetors or DFI Direct Fuel Injection and attending a factory service school is almost a necessity for diagnosing the ignition system or fuel system.
The gearcase is a traditional mechanical shift design and rebuilding it is relatively simple with a pinion height measuring tool. Home Site Map Legals. There are three very distinguishing characteristics that separate them from the engines: The first and most obvious is the modern, sharp edged, triangular engine cover that emphasizes the low profile of the 90 degree crossflow V4 engine a contrast to Mercury's tall inline six cylinder.
Fourth Generation: Service on the newer 60 degree V4 is a little more complicated. GLM's Conversion Kits. Superior Marine Manifolds. Help For Dealers.
Sand Cast vs. Die Cast. Pistons: Cast vs.
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