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The Hidden Factory Bolt That's Destroying Truck Engines

The Hidden Factory Bolt That's Destroying Truck Engines

The Diesel Podcast Dec 24, 2025 45 min
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About this episode

A major issue with the factory grid heater in 6.7 Cummins engines is causing catastrophic engine failures, prompting the introduction of a new intake horn and grid heater product by Fleece Performance. This episode dives into the design and testing process of the product, which aims to eliminate the failure point while maintaining cold start functionality. The hosts discuss the importance of reliability for truck owners who depend on their vehicles for work, and they share insights from their recent unveiling at PRI. Listeners will learn about the product's features, installation process, and pricing.

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Technical Too Afraid to Ask
Company

Amsoil

"And you guys had a new partnership, product unveiling with Amsoil and oil, which we chatted about."

Amsoil makes special engine oil that helps engines run smoother and last longer.

Car

Ram Trucks 6.7L Cummins engine platform

"You know, specifically speaking to the six, seven engine platform, so 07.5 to 2024 ram trucks are all equipped with this grid heater."

This is a big diesel engine that powers many Ram trucks. It’s famous for pulling heavy loads and running smoothly.

Part

intake plate

"But we have been selling replacement intake plate for years for those people that want to get rid of, you know, the factory grid heater because it's such an issue."

The intake plate is a part of the engine that helps air get into the cylinders. It can have extra parts on it to keep the engine running smoothly.

Term

factory grid heater

"Number one was, to John's point, it was eliminating this factory grid heater that commonly has the bolt that falls off and gets sucked into the engine."

A factory grid heater is a small device that keeps the air entering the engine cooler, which helps it run better. Sometimes its parts can break off and cause problems.

Part

heating elements

"That was number one, and all that John talked about some of the heating elements as we get into that."

Heating elements are small electric parts that warm the air going into the engine, helping it run smoother.

Car

2024 Ram

"...2024 ram into a cold chamber, the whole truck."

A Ram is a big truck made by Ford. The 2024 Ram is the newest version that year.

Part

intake manifold

"Maybe I'd just like the R&D side of it or the engineering side, but can you talk me through maybe the process for finding where the sweet spot was? Let's not say the cold weather kit, but just the standard where it's on the backside of the intake manifold."

Think of it as a pipe that sends the air (and sometimes fuel) to each part of the engine where it burns. It helps make sure every cylinder gets enough air.

Part

temperature probe

"We had the intake instrumented with temp probe, so we could see how that actual unit heated up and where it was seeing the most heat."

It's a small sensor that tells you how hot something is inside the engine.

Car

2019 RAM 3500

"I had just gotten a 2019 3500 RAM and I driven it around for about six months."

A RAM 3500 is a big truck that can haul heavy loads. The 2019 model was the year it was made.

Term

flow bench

"We were able to float test this intake horn on our flow bench here. We also did some chassis down in work just to compare."

A flow bench is like a test machine that measures how much air can pass through parts of the car. It tells engineers if a part is good or needs improvement.

Part

intake horn

"We were able to float test this intake horn on our flow bench here. We also did some chassis down in work just to compare."

The intake horn is a pipe that helps bring air into the engine. A better design can let more air in, which can make the car run faster.

Part

cylinder head

"Your restrictor is the cylinder head. So our ability to flow air into the cylinder is directly related to the ability of the cylinder head to flow."

The cylinder head sits on top of the engine cylinders. It holds important parts like valves and spark plugs, and how well it works affects the car’s power.

Company

Kershaw

"So if you're in the market, head on over to Kershaw.kaiusa.com."

Kershaw makes parts that can improve a car’s performance or appearance, like suspension upgrades or body kits. They’re popular among car enthusiasts who want to tweak their vehicles.

Part

cabin chassis

"Patrick, there's this will also cover cabin chassis."

The cabin chassis is the part of a car that holds everything inside – seats, steering wheel, and dashboard. It helps keep the car strong and safe.

Part

carburetor

"So we're working on pursuing the carburetor for this kit, which will have, you know, the coverage from 08 to 24."

Think of a carburetor as a mixer that blends air and gasoline so the engine can run smoothly.

Part

gasket

"But yeah, so what you're going to get in the kit is obviously you're going to get your intake, you're going to get your intake plate, gasket, set that goes with this kit."

Gaskets are like rubber or metal seals that keep fluids from leaking where parts touch each other.

Term

map sensor plug

"We will have a map map sensor plug so that no matter which configuration your truck has, you can plug whichever hole you don't need to use."

It’s a plug that lets you add or take out a sensor that measures how much air is in the engine’s intake, useful for customizing performance.

Part

intake air temp extension harness

"And then there'll be intake air temp extension harness to again aid in every different configuration."

It’s a bundle of wires that lets you measure how hot the air entering the engine is, even if your car doesn’t have a built‑in sensor.

Term

cold weather kit

"So, the only thing that would be separate if I wanted it would be the cold weather kit with the second heater, that's what I would, that's what I'd order separately if I if I needed it."

A cold weather kit is a bundle of parts that help a car stay warm and run better when it’s very cold outside, like extra heaters or better insulation.

Part

second heater

"So, the only thing that would be separate if I wanted it would be the cold weather kit with the second heater, that's what I would, that's what I'd order separately if I if I needed it."

A second heater is an extra device that keeps the car’s interior or engine warm when it’s very cold, so you don’t feel chilly inside.

Part

intake plenum

"I can't remember which diesel shop had posted a picture of one that there was truck in the shop and the nut had dropped into the intake, a plenum. And I don't remember exactly where it ended up..."

Think of the intake plenum as a big air box that splits the air coming into the engine so each cylinder gets enough air to burn fuel properly.

Concept

long block

""if you've purchased a long block from police, you know, we have parts that will help...""

A long block is basically a big engine that’s already put together except for the top part. It makes it easier to replace or upgrade an engine because you don’t have to build it from scratch.

Part

intake system

""We also have an intake system to put on that cylinder head to protect your investment.""

The intake system is the part that brings air into the engine. A better or cleaner intake can help the car run smoother and faster.

Part

intake heater element

"a lot of people would just remove that factory intake heater element and they would just be stuck with a rough cold start or, you know, it wasn't very refined."

It’s a little heater that warms the air going into the engine so it starts better when it’s cold.

Part

rail

"I have to be removed. You're pulling the rail, you're pulling the existing grid heater out of there..."

A rail is a tube that carries fuel or air to the parts of the engine that need it. Think of it like a pipe that feeds the engine.

Part

coils

"So there's not a lot of extra cables and coils and bolts..."

Coils are parts that create the spark that lights the fuel in the engine, making it run.

Part

cables

"So there's not a lot of extra cables and coils and bolts..."

Cables are the wires that connect different parts of a car so they can talk to each other and work together.

Part

bolts

"So there's not a lot of extra cables and coils and bolts..."

Bolts are metal screws that hold parts of the car together, like a screw holding a picture frame to a wall.

Part

billet piece

"And go from a billet piece to a cast piece. Again, to kind of condense part numbers keep our kids uniform."

A billet piece is made from a solid chunk of metal that’s cut into the exact shape you need, making it very strong.

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