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JD 855 Glow Plug

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Guy

07-25-2002 10:15:47

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I know... I know... this site is for antique tractors, and I own a couple of those, too, if that counts towards anything. :)
Can anyone tell me how to check if the glow plug is working or not on my 855? I just bought it last week and it was really hot the day I picked it up so I assumed that since I didn't see the light or hear it that it was just not needed. Since then, I still have not seen the light or heard it. On the 755 my dad owns, you can actually hear the G.P. warming up, in addition to seeing the light. The 855 does neither but seems to start right up with no problems. I am a little nervous about it since it can get pretty cold in northern PA in the winter months. If it is not working, I would like to work towards getting it fixed. Any suggestions, or ideas on checking/testing what I have, or repairing it? I know very little about diesels but am pretty mechanically inclines and certainly not afraid to dig into it. I don't even know where it is located or where to start. I don't thing it is the actual bulb since I can't hear it either. Thanks for any help!

Guy

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F-I-T

07-25-2002 14:38:18

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Re: JD 855 Glow Plug in reply to Guy, 07-25-2002 10:15:47

Guy:

Good news / Bad news. Good News is that your 855 doesn't have glow plugs. 755's do, as they are indirect injection. 855's are direct injection and have only a small heater element in the air intake system right on top of the manifold (you will see the large red lead hooked to it. It warms the air as it enters during starting and for about 30 seconds after key release/engine running. It only functions if the temperature of the engine is below 40*F on early models or under 64*F on later models. There is a way to jumper and test the cold start controller, but it would take a bit to explain it here.

Easy way to test it is to connect a 12V test light/voltmeter to it on a chilly PA morning, and turn the key on. Hard way to test it is to remove the sensor and put it in the freezer (suggested by the book !?!).

If you want to try and test it, I'll be happy to type it out as best I can.

Lemme know.

Frank-in-Tallahassee
70D // 855

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Clooney

07-25-2002 12:51:16

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Re: JD 855 Glow Plug in reply to Guy, 07-25-2002 10:15:47

Guy, first make sure it is cold. Maybe morning after it sits all night. Then locate the glow plugs power strap, or at least the glow plugs & set a voltmeter to the 0-15 or 0-25 D.C. volt setting & place between any glow plug terminal & ground, then turn the key on. You should see battery voltage or pulsed battery voltage. ~~If no voltage you have an open circuit, power supply, relay or timer problem. If you have voltage you can separate the plugs from the power strip & measure the resistance to ground [there should be some, how much I don't know]. If open the plugs are burnt up. They should all be the same or close.
~If you don't want to go through all that hassle you might be able to just turn the key on with a cold engine & reach in & feel the glow plug bases [if hot they are working]...

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ChuckW

07-25-2002 11:07:56

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Re: JD 855 Glow Plug in reply to Guy, 07-25-2002 10:15:47

the glow plug are on the top side of the head and should stick out at you like a sore thumb. There is a large wire connecting them together that is fire from the ignition witch through a kick out relay. I'm referring to a 755 and I suppose the 855 also has glow plugs. There is a procedure for checking resistance, but I can tell you that they are not to expensive, I believe $20 something a piece. Very important item.

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