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Go Back   Dodge Cummins Diesel Forum > 07.5 - 09 6.7 Liter Cummins > 07.5 - 09 3rd Gen 6.7L Powertrain
07.5 - 09 3rd Gen 6.7L Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine, Transmission, etc...NO ADVERTISING

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Old 08-04-2007, 04:39 AM   #1 (permalink)
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no glow plugs

I was test driving my new megacab last night and i asked the salesman where the display for the glow plugs was at and he said its no longer there. Am i crazy or just ignorant. NO GLOW PLUGS?

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Old 08-04-2007, 05:37 AM   #2 (permalink)
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well im not positive but im pretty sure cummins have been glow plugless since 1989 so that would mean theses engines ignite on compression ignition. im sure someone will explain all of this much better than i can.
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Old 08-04-2007, 09:08 AM   #3 (permalink)
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Cummins doesn't use glowplugs. They use an intake heater or grid heater. All 6 cyl. diesels big or small use this setup. Now V8's like Duramax and Powerstroke have glowplugs b/c of the layout of the V8. But all Cummins do have a heater, but it usually it's used at a lower temp. This time of year they are just not needed. Maybe why do don't get a light. Mine won't stay on more than 1 sec in the morning. Below 55* is when they start kicking in, I believe.
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Old 08-04-2007, 09:38 AM   #4 (permalink)
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If you check your book under instrument / gauge cluster, the pictogram indicating your grid heater is on, is a coil that will stay on if needed. If not needed, it will not lite.
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Old 08-04-2007, 09:43 AM   #5 (permalink)
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Cummins 5.9 and 6.7, never had glow plugs. Too prone to failure. The grid heater is a better design.

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Old 01-20-2009, 08:17 PM   #6 (permalink)
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If your heated grid went out you would just have a little bit of trouble starting it in the cold.
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Old 01-20-2009, 08:20 PM   #7 (permalink)
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It would have to be around zero to have any no starting issues. Alot of guys on here pull them out.
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Old 01-20-2009, 08:50 PM   #8 (permalink)
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Grid heaters (intake manifold heaters) are much more reliable than glow plugs and rarely fail.
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Old 04-30-2011, 01:25 PM   #9 (permalink)
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Quote:
Originally Posted by bucket truck View Post
Cummins doesn't use glowplugs. They use an intake heater or grid heater. All 6 cyl. diesels big or small use this setup. Now V8's like Duramax and Powerstroke have glowplugs b/c of the layout of the V8. But all Cummins do have a heater, but it usually it's used at a lower temp. This time of year they are just not needed. Maybe why do don't get a light. Mine won't stay on more than 1 sec in the morning. Below 55* is when they start kicking in, I believe.
Is there a grid heater just for the fuel in addition to the one under the intake horn?
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Old 04-30-2011, 04:10 PM   #10 (permalink)
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Is there a grid heater just for the fuel in addition to the one under the intake horn?
The grid heater is the one under the intake horn, and heats the intake air.
There is a fuel heater near the fuel filter to help prevent fuel gelling.
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Old 04-30-2011, 05:54 PM   #11 (permalink)
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To give you an idea of grid heater reliability, my old 2001 had 485 000km on it, living all it's life in frigid Alberta, using the grids except about 3 months of the year. I did put in a new set of relays back at around 450 000km, but the grid heaters have never failed on that truck. In the real cold the grids would fire for about 20 seconds. As a Ferd guy how many times he's replaced glow plugs
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Old 04-30-2011, 08:30 PM   #12 (permalink)
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Quote:
Originally Posted by 95dodgectd View Post
well im not positive but im pretty sure cummins have been glow plugless since 1989 so that would mean theses engines ignite on compression ignition. im sure someone will explain all of this much better than i can.
To correct you EVERY diesel is run off of compression ignition no matter what a glowplug simply warms the cylinder if its to cold out to help in compression ignition


Quote:
Originally Posted by bucket truck View Post
Cummins doesn't use glowplugs. They use an intake heater or grid heater. All 6 cyl. diesels big or small use this setup. Now V8's like Duramax and Powerstroke have glowplugs b/c of the layout of the V8. But all Cummins do have a heater, but it usually it's used at a lower temp. This time of year they are just not needed. Maybe why do don't get a light. Mine won't stay on more than 1 sec in the morning. Below 55* is when they start kicking in, I believe.
and another correction not EVERY 6cyl uses grid heaters most OTR trucks do not have them those are all inline 6cyl
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