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Tractor Talk Discussion Forum

Hows a diesel work

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tractorfan

03-05-2008 19:19:30




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i have a bet riding with a friend on how diesels work i say glow plugs used in some diesels to warm cylinder then its all heat and compression from there he says glow plugs always need to be on when running thanks for answers




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dave guest

03-06-2008 19:17:53




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 Re: Hows a diesel work in reply to tractorfan, 03-05-2008 19:19:30  
Been a long time, 1962, I know glow plugs are only for starting. But seems like to me I had to use them summer and winter. Mercedes 190D. Glow plugs had a separate manual momentary switch. Darn thing ran good but nobody knew nothing about them but dealers. Even truckers scratched their heads back then. One neat thing when I changed oil I went to buy a gasket. It was a canister type filter. Dealer's parts man said, "no such animal. Machined so well no gasket needed." Stove oil was 19 cents. Cold weather, left it run all night. Beautiful car, leather seats, 4 speed on the column. Good for 60 or 70 mph and super mileage. Parts were like gold.

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Mike (WA)

03-07-2008 08:40:56




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 Re: Hows a diesel work in reply to dave guest, 03-06-2008 19:17:53  
I had a '68 Mercedes diesel, and it had a little thing looked like a cheese grater, and it had a looped iron wire inside, that supposedly heated up at the same rate as the glow plugs. So when it got orange, you pulled the lever on out farther to engage the starter. After it started, release the lever, and it would USUALLY go in far enough to turn off the glow plug- but sometimes hung up a bit, so you had to watch the ole cheese grater to be sure it turned off. A little primitive, but a fun car. It wasn't exactly "life in the slow lane"- more like "life in the bike path".

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Mike (WA)

03-06-2008 08:30:34




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 Re: Hows a diesel work in reply to tractorfan, 03-05-2008 19:19:30  
We had an '85 Ford 6.9- they were famous for glow plug sensor(s) malfunctioning. "That sinking feeling" is defined as going 70 on the freeway, and the glowplug light goes on. When they come on in a hot engine, they get cooked in short order, and there goes another C-note for a new set. Finally disconnected the sensors altogether, and just used a button under the dash for start up. End of problem.

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Buzzman72

03-06-2008 08:24:10




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 Re: Hows a diesel work in reply to tractorfan, 03-05-2008 19:19:30  
A search engine can be your friend.



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cj3b_jeep

03-06-2008 04:51:04




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 Re: Hows a diesel work in reply to tractorfan, 03-05-2008 19:19:30  
I sure wish mine had glow plugs, it'd be a whole lot easier to start on days like today.



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Walt davies

03-05-2008 19:50:51




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 Re: Hows a diesel work in reply to tractorfan, 03-05-2008 19:19:30  
Take him out to a place that has old diesel engines and then ask him to find the Glow Plugs. An early IHC 1066 or so has no glow plugs but it does have a button to inject ether in to the manifold. Walt



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Bill(Wis)

03-05-2008 19:33:27




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 Re: Hows a diesel work in reply to tractorfan, 03-05-2008 19:19:30  
Suck, squeeze, bang and blow. No glow plugs required.



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MN Rick

03-06-2008 05:00:00




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 Re: Hows a diesel work in reply to Bill(Wis), 03-05-2008 19:33:27  
Tell a 460 diesel that.....lol



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Dave from MN

03-06-2008 03:51:06




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 Re: Hows a diesel work in reply to Bill(Wis), 03-05-2008 19:33:27  
I just told the wife she needs to run like a diesel!!!! She"s giving me a confused look. I"ll email your explanation to her work. Better for her to read it there than here, now!



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Tim B from MA

03-06-2008 09:01:39




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 Re: Hows a diesel work in reply to Dave from MN, 03-06-2008 03:51:06  
Where are you sleeping tonight?



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JRT

03-05-2008 19:44:01




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 Re: Hows a diesel work in reply to Bill(Wis), 03-05-2008 19:33:27  
Bill, good discription. I like that.



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Bill(Wis)

03-05-2008 19:48:38




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 Re: Hows a diesel work in reply to JRT, 03-05-2008 19:44:01  
And it applies to most of the engines we're used to including gas turbines and jets.



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ericlb

03-05-2008 19:32:55




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 Re: Hows a diesel work in reply to tractorfan, 03-05-2008 19:19:30  
you can also mention that big truck diesels more than a few years old, dont have any glow plugs at all and they start and run too, some late model trucks now i understand do have them as well as pickup diesels but even so they only help with initial cold starting, then they are off



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RobMD

03-05-2008 19:30:21




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 Re: Hows a diesel work in reply to tractorfan, 03-05-2008 19:19:30  
that's FUNNY!

You just ask him this - why the heil would the glow plugs need to be on all the time if the compression creates all the heat?



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Gene Davis (Ga.)

03-05-2008 19:25:58




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 Re: Hows a diesel work in reply to tractorfan, 03-05-2008 19:19:30  
Collect your beer or steak dinner whichever the case is and then tell him he is thinking about a model airplane engine,



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big fred

03-05-2008 20:34:31




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 Re: Hows a diesel work in reply to Gene Davis (Ga.), 03-05-2008 19:25:58  
And a model airplane engine doesn't need the glow plug "on" once it's started. The heat from the burning mixture keeps the glow plug glowing.



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J KEMP

03-05-2008 19:23:42




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 Re: Hows a diesel work in reply to tractorfan, 03-05-2008 19:19:30  
U WIN



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Bob Huntress

03-05-2008 19:23:27




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 Re: Hows a diesel work in reply to tractorfan, 03-05-2008 19:19:30  
Glow plugs are simply a cold weather starting aid, if that answers your question.



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Ken Macfarlane

03-06-2008 06:20:14




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 Re: Hows a diesel work in reply to Bob Huntress, 03-05-2008 19:23:27  
Seems to me even the cummins trucks motors only use a preheat grid, no plugs.



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