Engine Maintenance
Overhead Valve Adjustments
Keep It in Spec. Keep It Working.
An overhead valve adjustment is one of the most important—and most commonly overlooked—parts of diesel engine maintenance.
At Redneck Diesel Performance, we perform precise overhead adjustments on heavy duty trucks and medium duty trucks. Whether you’re running a Cummins, Detroit, PACCAR, CAT, or MaxxForce, keeping the valve lash within the manufacturer’s specifications is critical to engine performance, fuel efficiency, and long-term reliability.
When the overhead gets out of adjustment, your engine may start showing signs such as:
- Rough idling
- Loss of power
- Poor fuel mileage
- Excessive engine noise
- Hard starting
- Uneven performance
Ignoring those warning signs can lead to premature valvetrain wear, damaged internal components, expensive repairs, and unnecessary downtime.
That’s why an overhead adjustment isn’t just routine maintenance—it’s protection for the engine that keeps your truck making money.
During the service, our technicians set the valve lash to the proper specifications and inspect accessible valvetrain components for wear or damage. We also check the crankshaft as part of the process, helping identify developing problems before they turn into major failures.
No guessing.
No “close enough.”
No cutting corners.
We measure it, set it, and check it thoroughly so your engine is dialed in the way it ought to be.
If it’s been a while since your last overhead adjustment—or your engine is starting to run rough, lose power, or burn more fuel—bring your rig to RDP.
We’ll help keep it running strong, smooth, and reliable mile after mile.
Internal Inspections
Catch the Wear Before It Becomes a Failure.
Keeping a diesel engine alive for the long haul means looking beyond what can be seen from the outside. At Redneck Diesel Performance, our internal engine inspections help uncover developing problems before they turn into expensive repairs or leave your truck stranded.
Depending on the symptoms and level of engine access, our technicians inspect critical components such as:
- Rocker arms and valvetrain components
- Fuel injectors
- Camshaft lobes
- Cylinder liners and liner protrusion
- Other accessible internal components
Worn rocker arms can affect valve operation. Weak or failing injectors can cause poor combustion, rough running, and power loss. Camshaft wear can hurt performance and damage the valvetrain. Incorrect liner protrusion can prevent the cylinder head from sealing properly, increasing the risk of head-gasket failure and serious internal damage.
These problems don’t always give you much warning—but when they finally show themselves, the repair bill can get expensive fast.
Whether we’re diagnosing a performance problem, completing an overhead adjustment, or inspecting an engine that’s already being opened up, we pay attention to the details. The exact components we can inspect depend on how far the engine is disassembled, but the goal remains the same: identify wear early and prevent a smaller issue from becoming a complete overhaul.
No surface-level guessing.
No ignoring warning signs.
No waiting for a small problem to become a big one.
If you run a Cummins, Detroit, PACCAR, CAT, or MaxxForce engine and want to know what’s really happening inside it, bring it to RDP.
We’ll look past the easy stuff and help you catch trouble before it costs you the road.
Internal Component Replacement Or Upgrades
Replace What’s Worn. Upgrade What’s Holding You Back.
When internal engine components start wearing out, you can patch the symptoms—or open it up and address the real problem.
At Redneck Diesel Performance, we provide complete diesel engine internal component replacement and performance upgrades for trucks built to work. Whether you’re dealing with normal wear, a failed component, or looking for greater durability and performance, we’ll help build the right setup for your engine and application.
We replace and upgrade critical components such as:
- Fuel injectors
- Camshafts
- Rocker arms
- Pistons
- Cylinder liners
- Rod and main bearings
- Valvetrain components
- Other internal engine parts
Our experienced diesel technicians work on Cummins, Detroit, PACCAR, CAT, and MaxxForce engines.
Failing internal components can cause more than an annoying noise or rough idle. They can lead to power loss, poor fuel economy, excessive oil consumption, uneven combustion, increased internal wear, and eventually complete engine failure.
Replacing worn or damaged components correctly can restore reliability, improve performance, and help your engine pull and operate the way it should under load.
But we don’t just open the engine and start swapping parts.
Our technicians inspect the related components, take critical measurements, verify clearances and tolerances, and assemble everything to the proper specifications. Any performance upgrade is selected with the engine, drivetrain, and intended use in mind—because more power doesn’t mean much if the rest of the setup can’t handle it.
No guesswork.
No mismatched parts.
No shortcuts inside your engine.
If your diesel is showing signs of internal wear—or you’re ready to upgrade its performance and durability—bring it to Redneck Diesel Performance.
We’ll build it to handle the work you throw at it.