Posted by Russel AZ on January 09, 2013 at 08:14:57 from (74.47.108.42):
In Reply to: Ford diesel question! posted by JayinNY on January 08, 2013 at 20:03:21:
Waiting for the glow plug "wait" lite to go out makes starting easier on the starter and battery. The wait light on time is judged by the current flowing to the plugs. The hotter they get the less current they draw. A cold glow plug with draw between 17 and 20 amps, depending on the watt rating of the plug. SO a system with 8 draws 140 to 160 amps cold. Glow plugs do not heat the cylinder. They make a hot point that ignites the mixture when compression pressure doesn't get the mixture hot enough. Glow plugs typically get a tip temperature of 1500 to 1700 degrees.
Starting ether can be used on the older in-direct injection diesels with glow plugs. Though it is not the best of ideas doing so likely will not cause engine damage. The use of starting ether in a direct injection has a high possibility of causing engine damage.
Ford's 7.3, as with modern diesels using direct injection, will start without glow plugs to lower temps than the old engines but takes considerable cranking. When it gets below 25* here we start hearing complaints about "hard starting" and pretty well know the glow plug system isn't up to par. Modern diesels also use the glow plug or preheater systems for emission control so having a working system is just a good idea.
Also, having great batteries and a quality starter will help. Starter's don't get attention until they die but on a diesel they should be replaced "just because" every three to four years on a daily driver. They are like shock absorbers in that they don't seem bad until you get new.
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