Why Won't My Diesel Start?

What It Takes To Make a Diesel Run

There are only three things that are needed to make a diesel run;.

Clamp Meter

(1) Heat from compression,

(2) Fuel at the Right time and pressure.

(3) enough crank shaft speed to contribute the compression. The engine must also have enough air.

A diesel in the purist form is a very uncomplicated engine.

What makes a diesel hard to start?

If the fuel is not injected into the cylinder at the strict time the engine will be very difficult to start. The fuel needs to be injected before the piston reaches top dead town to generate a flame front in the cylinder. The timing is requisite for strict engine operation.
If the fuel injection pressure is not enough the engine will be hard to start. Injection pressure is difficult to test and regularly manifest it self in hard starting, lack of power and sometimes smoke from unburned fuel.
The engine must crank at enough speed to contribute the requisite compression, heat in the cylinder to ignite the fuel. Many hard starting problems with diesel engines can be attributed to a poorly functioning starter.

How can I the do it yourselfer check some of these things?

If you own a diesel and are going to work on it, it might be worth while to invest in the tools to set the fuel injection timing. There are many methods of setting the timing of a diesel. Some older diesels use a drip tube. The V.W. Diesels us a dial indicator for checking pump plunger travel on the Idi engines (Indirect Injection). Some of the Cummings diesels are timed in the same manner. Some of the new diesels are timed using a scan tool to inter face with the engine management computer.

If you are going to work on your diesel, buy a book, preferably the facility manual.

You can check to see if all fuel filters are clean.

You can check to see if your glow plugs are working. The best recipe that I have found to check glow plugs is to use a direct current (Dc) amp clamp. This is a meter that clamps over a wire and read the whole of current flowing straight through it. Most glow plugs pull about 9 amps after the introductory surge. You can get the strict shape from the manufactures technical data. Dc amp clamps are a lot cheaper now than they were in the past. I bought the small hand held unit that our shop uses for Sears for under .00. If you use starting fluid in a diesel with glow plugs it nearly all the time burns out the glow plugs even if they are new ones.

The amp clamp that you bought to check your glow plugs is a good tool to check your starter. portion the current draw of the starter and correlate it to the manufacturers specifications. Any thing beyond these uncomplicated things will wish specialized tools and knowledge.

Why Won't My Diesel Start?

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