![]() ![]() Keep in mind that this timing diagram is only used to explain the principles of operation and the general timing of these events in relationship to the position of the crankshaft. Although each point on the timing diagram is just an example, all four-stroke events generally occur somewhat near the points shown. The exhaust stroke continues to about 10 degrees BTDC at which time the cycle starts all over again. The power stroke goes to about 12 degrees BBDC. The compression stroke then continues to the ignition point, about 15 degrees BTDC. To begin, the intake valves open about 10 degrees BTDC. During the four cycles of operation, the crankshaft revolves two complete revolutions or 720 degrees of rotation. Two circles are shown to represent two complete revolutions of the crankshaft. The mark at the bottom of the graph would illustrate the position of the piston at BDC. Any event that happens after top dead center is called ATDC or after top dead center. Any event that happens before TDC is referred to as BTDC or before top dead center. For example, at the top of the diagram, the piston would be located exactly at TDC (Top Dead Center). One way to look at this diagram is to think of these events in terms of the position of the crankshaft and 360 degrees rotation. The diagram is set on a vertical and horizontal axis. Describing the Principle: A timing diagram is a method used to identify the time at which all of the four stroke events occur on a typical four-stroke engine. This entry was tagged Electrical, Engine. Once the engine starts the timing should be set with a timing light. Install the dust cover, rotor, distributor cap, spark plug and plug with. If the rotor is just a degree or two off from lining up with the mark you made for the number one tower, rotate the distributor and tighten the clamp. To compensate for this movement, move the rotor a few degrees back of the mark before installing the distributor. Because the teeth on the distributor gear are curved, the rotor will rotate a few degrees when the distributor is installed. Loosen the screw clamp at the base of the distributor to remove the distributor. Data collected from an old Niehoff tune-up chart. There is a legend at the bottom of the page describing some of the terms used here. If the rotor is pointing to another tower/cylinder, the distributor will have to be removed, the rotor turned slightly and the distributor reinstalled. It is always best to have the original service or operators manual for your tractor before attempting any tuneup. ![]() In this position, the rotor should be lined up with mark on the side of the distributor. When the “0” or “DC ” mark lines up with the line on the edge of the timing hole and there is pressure on your thumb the piston will be at top dead center or TDC. Continue rocking the tractor backwards or slowly crank the tractor until the “0” or “DC” mark appears, and you feel pressure or compression on your thumb from the cylinder. Have an assistant slowly turn the engine with the hand crank or put the tractor in reverse gear, put your thumb over the number 1 spark plug hole, and slowly rock the tractor backwards while checking for the timing marks to appear in the timing hole. Remove the distributor cap, rotor and dust cap, and then reinstall the rotor. Mark the position of the distributor cap tower with the wire going to the number 1 spark plug on the side of the distributor. Remove the number 1 spark plug, and the timing hole cover. Start by checking the static timing and then check it with a timing light. Failure to perform as desired was usually attributed to failure to maintain. He constantly preached the need to maintain Ferguson tractors and equipment in the highest state of repair to obtain the maximum level of performance. Harry Ferguson considered maintaining correct timing an important task. ![]() Celebrating the 70th Anniversary of Coventry's Ferguson TE-20 tractor.Rachel rebuilds a MS carburetor for a Ford but this video applies to any small tractor MS carb.Rachel at 'Farm Tractor Repair' fixes a hydraulic pump in a MF-35.'A Ferguson Tractor' by Richie Kavanagh.Expo 2016 Republic MO Saturday Tractor Rebuild.Expo 2016 Republic MO Thursday Tractor Rebuild.2015 Homecoming Days Parade Birmingham IA.2015 Cumberland Valley Antique Engine and Machinery Show.2006 PATOOT (Peterson Annual Trip on Old Tractors).Miscellaneous Parts Colors and Finishes.TO-30 SN to Engine Number Cross-Reference.Ferguson Tractor SN’s – 1933-1947 (Ferguson Black, Ferguson Brown, Ford 9N and 2N). ![]()
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