Re: 706 d

Posted by Allan on October 17, 2003 at 14:09:29 from (148.63.132.164):

In Reply to: 706 d posted by nate on October 16, 2003 at 18:28:26:

Nate,

At the risk of sounding like a broken record, let me say this:

That old gal uses a low pressure diesel pump. That means that the fuel is not atomized enough to ignite at the lower tempreatures like your newer high pressure units do.

In other words, they cannot "start from cold" without some help.

Hence, the 12 volt glow plugs are used to preheat that combustion chamber to a tempreature whereby the fuel will ignite.

Now, if one glow plug is not working and the other five are, the engine of course, is still going to start; but that one cylinder is going to push raw fuel until the effect of the compression itself (a few cycles of the engine compression stroke) in that bad cylinder, raises the tempreature in that cylinder to the ignition point. I'm guessing this is why you are getting the smoke....but, I'm diagnosing over the phone here too.

The glow plugs are very easy to test: Pull all the leads off all of the glow plugs. Then with a test light, with it's lead attached to the POSITIVE battery voltage, touch each glow plug terminal with the pointer one at a time. If you find one that does not light the test light, that's your boy.

If you find a bad one, there are some tricks to changing it out sometimes....they have a nasty habit of carboning at the tip and even sometimes will swell to the point that they just will not come out.....but, this is another chapter. Let us know what you find.

Now, if you find that all are okay, then I will bow to all these other fine gentlemen here and the advice that they have already given you: Hold the button down longer before the crank, hold it thru the crank, and for a short while after she pops off. But, you shouldn't be getting an excessive amount of smoke.

Regards,

Allan

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