If you've ever sat in your truck on a freezing morning wondering what is a grid heater on a 6. 7 Cummins while waiting for that little curly-q light on the dash to switch off, you aren't alone. It's one of those components that most individuals don't think about until it halts working or, worse, until they hear horror stories regarding it failing and taking the whole engine down with it. Simply put, the grid heater is your engine's best friend when the particular temperature drops, acting as a heavy-duty warming element that will makes sure your own diesel beast actually fires up when you turn the important thing.
Unlike a gas engine that will uses spark plugs to get the party started, a diesel engine depends on compression. When air is squeezed tight enough, this gets hot—hot good enough to ignite diesel powered fuel. Nevertheless it's ten degrees outdoors and your engine unit is a giant portion of frozen metal, that air loses its heat to the cylinder wall space way too fast. That's where the grid heater actions in to conserve the afternoon.
Exactly how the Grid Heater Actually Works
Think of the particular grid heater as a high-powered best toaster oven oven sitting best inside your intake manifold. Whenever you turn your own key to the particular "on" position, the truck's computer (the ECM) discusses the ambient temperature plus the engine coolant temperature. If it decides it's too cold for a reliable start, this sends a huge amount of electric juice to a series of heating system elements.
These elements are arranged in a grid pattern—hence the name—and they sit down directly in the path from the inbound air. Since the air passes through this glowing hot nylon uppers, it accumulates enough heat to ensure that whenever it hits the combustion chamber, the compression can actually do its job. This is precisely why you have to "wait to start. " You're literally awaiting that toaster to obtain red hot therefore the engine doesn't have to struggle through a "cold" start, which usually is incredibly tough on the internals.
Even after the truck starts, you might notice your lights dimming or even your voltage measure dancing around with regard to a few minutes. That's since the grid heater often continues to cycle on and off as the engine is warming up. This helps reduce that annoying white smoke you sometimes see on frosty mornings and keeps the engine operating smooth until it reaches a steady operating temperature.
Grid Heaters vs. Glow Plugs
If you've invested time around Ford or Chevy diesels, you've probably heard of glow attaches. While they actually a similar job, they go about this differently. Glow attaches are tiny little heaters located within each individual cylinder. Every single cylinder has its own.
Cummins, on the particular other hand, offers stuck with the particular grid heater design and style for a lengthy time. Instead of heating each cylinder individually, they just heat up all the atmosphere entering the engine in one go. There are pros and cons to this. On the plus aspect, you only have one particular heating assembly to deal with instead than six distinct glow plugs that will can get trapped in the head. On the downside, the grid heater pulls a substantial amount of amperage—way more than glow plugs—which is precisely why your batteries need to be in tip-top shape throughout the winter.
The Infamous "Killer Bolt" Issue
We all can't talk regarding the 6. 7 Cummins grid heater without mentioning the hippo in the room: the "killer bolt. " In case you spend any time on diesel forums or chat to long-time Ram memory owners, this topic is bound to show up. It's probably the biggest cause people start researching what this component is to begin with.
The grid heater is held jointly by a stud and an enthusiast that carries the particular electrical current. Over years of temperature cycles—getting red very hot and then chilling back down—that link can start to break down. In some instances, the arc of electricity in fact starts to melt the particular area round the nut. If it gets bad enough, the nut or a chunk of the particular heating element can literally vibrate loosely and fall straight down into the consumption plenum.
Since the intake rests right above the particular cylinders, there's just one place for that will metal to move: straight into the engine. If a piece of equipment gets sucked into a running six. 7 Cummins, it's usually game over for your engine. We're speaking about catastrophic failing that needs a full rebuild or a new long wedge. It's an uncommon occurrence in the grand scheme associated with things, but it's frequent enough that will a lot of owners get pretty nervous regarding it once their trucks hit higher mileage.
Symptoms Your Grid Heater Is Struggling
So, how can you know if yours is on the fritz? The most obvious sign is a truck that's grumpy in the morning. If this takes forever in order to crank, or when it starts and runs really tough with a large amount of white smoke for your very first thirty seconds, your grid heater may not be getting hot enough—or in all.
A person should also keep an eye on your voltmeter. When that "wait in order to start" light is on, you ought to see an apparent drop in ac electricity. If the needle stays perfectly still, it's a sign that the solenoids aren't clicking over or the element alone has burnt out. Sometimes you'll also get a check engine light along with a code like P2609, which is the truck's method of saying, "Hey, the particular intake heater isn't doing its work. "
Another thing to look regarding is physical indicators of "jiggling" or even charring at the power post on the intake a lot more. In case you see any kind of melted plastic or when the post seems loose when you give it a tiny wiggle, you need to address it instantly before it becomes a "killer bolt" situation.
Choices for Maintenance plus Upgrades
In case you're worried about the reliability of the stock setup, you have a few ways to go. Some guys choose to do a "grid heater delete. " This entails removing the heater entirely and changing it with a hollow spacer. The particular benefit? Zero possibility of a bolt falling into the particular engine and a slight increase in airflow. Drawback? When you live anywhere that gets in fact cold, your vehicle is going in order to hate life within the winter. You'll be relying entirely on the stop heater and several very stressed-out electric batteries to have the truck began.
A even more popular middle floor is a grid heater relocation. Businesses like Banks Energy and others create intake plates or "Monster Rams" that will move the heating element to a different spot or use a different style of heater that doesn't have got the same failure point since the factory stud. It offers a person the peace associated with mind that the motor won't eat a piece of metallic, but you nevertheless get to keep the easy cold-weather begins.
Wrapping This Up
At the end of the day, knowing what is a grid heater on a six. 7 Cummins is just part associated with the deal when you own one of these brilliant trucks. It's a simple, effective bit of technology that can make diesel ownership very much more bearable when the snow starts flying. While the particular factory design does have a known weak point with that power stud, it isn't something that should make you panic—it's just some thing to be conscious of and inspect occasionally.
Keep your batteries clean, listen to exactly how your truck starts on cold days, and maybe take a look at that power post every time you change your own oil. If a person take care of the electrical system and maintain an eyesight on the hardware, that grid heater will keep your own Cummins firing up reliably for thousands of miles. Whether you decide in order to keep it share, relocate it, or even delete it completely depends on where you live and how significantly you trust that will factory bolt, yet now at least you know exactly what's happening behind the scenes when you're waiting for that dash light to visit out.