Warming up a diesel

[Irlpguy]

quote:Originally posted by TAKPAK

Can't say on the Ford or Ram diesels, but GM still uses glow plugs. Our new 2015 GMC has the "glows" in it. I have heard that Ram uses an "air heater" but don't know about Ford. The older ones (7.3's) did have glow plugs.

My 2012 Ram uses an air intake heater I would assume they are still using this method on the newer models. My truck also has remote start, the procedure it follows is this:
1) Doors lock
2) Air Intake heater comes on
3) Engine starts at idle, then speeds up after a few moments to about 900 rpm
4) Seat heaters and steering wheel heater come on and heater fan goes to mid range, rear view mirror heaters come on.

The truck will run for a predetermined time, then return to idle and shut down.
You have to unlock the doors, insert the fob in the ignition and turn it on before you can drive away or manually shut the engine down.

Instead of heaters coming on in hot weather the procedure is the same but the AC comes on as well as the seat cooling fans.

Warm butt, warm hands or cool butt, life is good.

What has been forgotten in this discussion is the wear and tear on transmissions, rear ends and wheel bearings if you just start up and head down the road in very cold weather, the engine is only part of what requires lubrication when starting out in cold weather.

Truckers in the north hauling equipment to the oil fields and so on never shut their trucks off, it is much easier on an engine to be idling at a decent speed than to be shut off and attempting to start them after a pretty short period of time at -50 degrees or so. If you have ever had to spray some ether into the intake of a truck that has not been running overnight you will know what I am talking about.

[jlb27537]

quote:Originally posted by Willy Bee

As far as I was told by my truck I have glow plugs in my 6.7 cummings. Because I have to wait until the little "glow light" goes off to start my engine.

Charlie, your 6.7 Cummins does NOT have glow plugs. It has a grid heater, same as a CAT.

[Tom S.]

quote:Originally posted by CORattler

Newer diesels don't have glow plugs. They have a heater grid that sits above the intake to warm the air that is being drawn into the engine. Watch the ammeter when you start a cold engine... it will draw down periodically... that's the heater grid heating up.

My 2015 Silverado has glow plugs, as does the 2015 GMC version. I'm pretty sure Ford use them too.

[hunts800]

Don't know the validity, but my dealer told me to try not to idle a cold engine more than five minutes. He said something about it screwing up the fuel system. He also said, as others have stated, to let a hot engine idle a minute or two after stopping to let the turbo cool down.

My experience has been that everyone who owns an older Dodge Cummins and is parked within 50 yards of my RV site is committed to idling their truck at 6am for at least 30 minutes. Must be in the Dodge owners manual!

[bigskyjimmy]

quote:Originally posted by hunts800

Don't know the validity, but my dealer told me to try not to idle a cold engine more than five minutes. He said something about it screwing up the fuel system. He also said, as others have stated, to let a hot engine idle a minute or two after stopping to let the turbo cool down.
LMAO..... TRUE STORY
My experience has been that everyone who owns an older Dodge Cummins and is parked within 50 yards of my RV site is committed to idling their truck at 6am for at least 30 minutes. Must be in the Dodge owners manual!

[Tom S.]

quote:Originally posted by hunts800

Don't know the validity, but my dealer told me to try not to idle a cold engine more than five minutes. He said something about it screwing up the fuel system. He also said, as others have stated, to let a hot engine idle a minute or two after stopping to let the turbo cool down.

My experience has been that everyone who owns an older Dodge Cummins and is parked within 50 yards of my RV site is committed to idling their truck at 6am for at least 30 minutes. Must be in the Dodge owners manual!

Perhaps your dealer can explain why the remote start system lets it run for 10 minutes - and can be cycled twice for a total of 20 minutes. If you shouldn't run the truck for more than 5 minutes, why would the remote start be set up that way?

As for the hot engine, my exhaust gas temp gauge verified that after running at 65 on the express way and pulling into a rest area, the exhaust gases and hence the turbo were back down to low temps by the time I get parked and am ready to get out of the truck.

[Willy Bee]

I was just talking to my mechanic and he said you have glow plugs in my but the cummins does come with both. All I know is I have to wait until the light goes out and I can start the engine.

[CORattler]

quote:Originally posted by jlb27537

Charlie, your 6.7 Cummins does NOT have glow plugs. It has a grid heater, same as a CAT.

100% correct

[CORattler]

quote:Originally posted by Tom S.

My 2015 Silverado has glow plugs, as does the 2015 GMC version. I'm pretty sure Ford use them too.

You are right. The Duramax and Powerstroke DO have Glow Plugs.

From the 2015 Chevrolet/GMC Duramax Diesel Supplement:
Wait-to-Start Light
If the wait-to-start light comes on,the glow plug system is required
and operating. Wait until the light turns off before starting the engine.
This light may not come on in warm temperatures. The fast warm-up glow plug system makes the wait-to-start light stay on for a shorter amount of time than most diesel engines.
See Starting the Diesel Engine on page 9-1.

Ford Powerstroke:
The spark plugs in the engine are now instant-start Glow Plugs that will start the engine quickly, even in cold winter conditions.

[jlb27537]

Charlie,

I refer you to read this link

http://www.cumminsforum.com/forum/94...low-plugs.html

[CORattler]

quote:Originally posted by jlb27537

Charlie, you really need to get a new mechanic. Ask him to show you a Cummings 6.7 glow plug and the part number for it.

Your engine has a grid heater that heats the incoming air. Same system as used on CAT engines. It does not have glow plugs.

I refer you to read this link, and while doing so, realize the mechanic you are using is a idiot.

http://www.cumminsforum.com/forum/94...low-plugs.html

A informative link... thanks!

[Phil P]

Hi

The original practice of warming up any engine before use was the result of the old technology. The pistons were cast iron and needed to be heated up so the fit the cylinder properly. Operating at rated power before the warm up resulted in “piston slap” and could cause piston failure.

This was corrected many years ago.

Phil P

[Willy Bee]

Your right it does have the heater I was mistaken I thought that my mec said glow plug he said it did not have glow plug. Told you before I am not the brightest bulb in the box LOL

[ALSAN]

One more thing because we are talking about idling the idle speed should be a fast idle , low idle speed lets raw fuel by the rings and into the oil . The Ram I have you do this transmission in park / foot off brake pedal turn on crusie control this will increase the rpm need it higher then nudge up the lever and it will go up till it stops at 1400 rpm
To disengage step on brake pedal

[Willy Bee]

quote:Originally posted by ALSAN

One more thing because we are talking about idling the idle speed should be a fast idle , low idle speed lets raw fuel by the rings and into the oil . The Ram I have you do this transmission in park / foot off brake pedal turn on crusie control this will increase the rpm need it higher then nudge up the lever and it will go up till it stops at 1400 rpm
To disengage step on brake pedal

Wish mine would do that I have a 12 speed stick in mine so it won't fast idle.

[CORattler]

[/quote]
Wish mine would do that I have a 12 speed stick in mine so it won't fast idle.
[/quote]
A 12 speed manual transmission?
I didn't know one was available for a Dodge Ram 2500. Who makes it?

[Phil P]

Willy Bee

If the truck came from the manufacturer that way even if it was an incomplete cab and chasse you should have a fast idle switch on the dash board somewhere.

You should never let a diesel idle at a slow idle for any extended period of time. When you walk around a truck stop you will notice the trucks sitting at idle are running at an elevated idle speed to prevent cylinder wash.

If this is an aftermarket modification the modifier needs further education.

Phil P

[ALSAN]

With my 02 Dodge I had a low tec fast idle solution bought a rod that had a hook to slide onto the steering wheel the other end to the accelerator turn knob on hook increase speed . Simple but worked

[Willy Bee]

quote:Originally posted by CORattler

Wish mine would do that I have a 12 speed stick in mine so it won't fast idle.
[/quote]
A 12 speed manual transmission?
I didn't know one was available for a Dodge Ram 2500. Who makes it?
[/quote] Have a fuller road ranger 12 s trans from eaton. same tran's
they put in big rigs

[Hooker]

This is another issue that is easily setteled by reading the owner's manual.