On big trucks the gears are NOT synchronized.So when you double clutch,you push down the clutch,move the stick to neutral,let cluch back out,let engine slow down RPMS,push down clutch,again,and put trans mission in next gear.You are making the gears match speed of the truck,so that it can be shifted.If you dont let the clutch back out after you put it in neutral,you cant shift it because when you push the clutch in,you disconnect the transmission from the engine and it slows down the gears faster than the engine slows down,then you cant shift until you reconnect the transmision to the engine by letting the clutch out again.
Its really nuts.For a long time now,people dont use the clutch.Years ago when they had straight cut gears,not heat treated,you would wear them out by grinding them.So you double clutched everything,cars and trucks.If you wear out hard,heat treated, gears we have now, grinding them,you better quit driving because you arent good at it!
Double clutching,even if it is recommended by transmission companys is just not done.Its not necessary.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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