TAT Express Inc

TAT Express Inc TAT Express Inc. specializes in class 8 truck repairs and trailer repairs. Full service shop for trucks and trailers that offer DOT and FMCSA Inpections

07/22/2026

🔧🚛 Loose Exhaust Brake Adjustment Found on Multiple Cylinders! 🚛🔧

While performing a routine overhead adjustment on this Volvo D13 engine, our technician discovered that the exhaust brake adjustment was loose on several cylinders. Although this issue isn’t always noticeable to the driver, improper exhaust brake adjustment can reduce braking performance and place unnecessary stress on engine components over time. ⚠️

💡 What is the exhaust brake?
The exhaust brake is an engine braking system that helps slow the truck by creating back pressure in the exhaust system. It reduces the workload on the service brakes, providing better control on long downhill grades and helping extend brake life.

⚠️ Why is a loose exhaust brake adjustment a problem?
When the exhaust brake adjustment is too loose, the engine brake may not operate as efficiently as designed. This can reduce braking power and affect the overall performance of the engine brake system.

👉 Common symptoms drivers may notice:
• Weaker engine braking on downhill grades ⛰️
• Increased use of the service brakes 🛑
• Longer stopping distances when relying on the engine brake 🚛
• Unusual valvetrain noise in some cases 🔊
• Reduced overall braking efficiency ⚠️

🔍 Did you know?
The exhaust brake relies on precise valve adjustments to generate the back pressure needed for effective engine braking. Even a small amount of excessive clearance can reduce its performance and increase wear on braking components.

💡 Why routine overhead inspections matter:
An overhead adjustment doesn’t just check valve lash—it also verifies that the engine brake is adjusted to manufacturer specifications. Catching loose exhaust brake adjustments early helps restore proper braking performance, improve safety, and prevent premature wear on both the engine and service brakes.

✅ At TAT Express, our technicians perform detailed overhead adjustments and engine brake inspections to ensure every component is operating exactly as designed. Proper adjustments today can help prevent costly repairs and improve your truck’s performance tomorrow.

📍 TAT Express – Dallas, TX
4140 Langdon Rd, Dallas, TX 75241
📞 972-225-3017
🌐 https://tatexpressinc.com/
✅ Semi-Truck, Trailer & RV Repair Specialists
✅ Built on Integrity. Striving for Excellence

07/22/2026

🔧🚛 Overhead Adjustment Revealed Tight Intake Valves & Loose Exhaust Valves on a Volvo D13! 🚛🔧

While performing a routine overhead adjustment on this Volvo D13 engine, our technician discovered that several intake valves were adjusted too tight, while several exhaust valves were too loose. This type of valve lash imbalance can significantly affect engine performance, fuel efficiency, and the overall lifespan of critical engine components if left uncorrected. ⚠️

💡 What is an overhead adjustment?
An overhead adjustment (also known as a valve lash adjustment) ensures the intake and exhaust valves have the correct clearance according to the manufacturer’s specifications. Proper valve lash allows the valves to open and close at the correct time for maximum engine performance and reliability.

⚠️ Why are tight intake valves a problem?
When intake valves are too tight, they may not fully close, causing:
• Reduced cylinder compression 📉
• Hard starting 🔑
• Loss of engine power 🚛
• Increased valve temperatures 🌡️
• Premature valve and valve seat damage 🔧

⚠️ Why are loose exhaust valves a problem?
Excessive valve lash can cause:
• Excessive valvetrain noise 🔊
• Improper valve timing ⏱️
• Increased wear on rocker arms and valve train components ⚙️
• Reduced engine efficiency ⛽
• Potential long-term engine damage 🚨

👉 Common symptoms drivers may notice:
• Rough idle
• Reduced power and acceleration
• Lower fuel economy
• Engine ticking or unusual valve train noise
• Hard starting or inconsistent performance

🔍 Did you know?
Valve lash gradually changes over time due to normal engine wear. That’s why manufacturers recommend periodic overhead adjustments. A simple adjustment performed at the proper service interval can help prevent expensive cylinder head and valve train repairs later on.

💡 Why preventive maintenance matters:
Performing overhead adjustments on schedule keeps the engine running efficiently, restores proper valve timing, improves fuel economy, extends engine life, and helps prevent costly downtime.

✅ At TAT Express, our technicians perform precise overhead adjustments using manufacturer specifications to ensure every valve is set correctly. It’s one of the best ways to keep your Volvo D13 performing at its peak for the long haul.

📍 TAT Express – Dallas, TX
4140 Langdon Rd, Dallas, TX 75241
📞 972-225-3017
🌐 https://tatexpressinc.com/
✅ Semi-Truck, Trailer & RV Repair Specialists
✅ Built on Integrity. Striving for Excellence

07/22/2026

🔋⚠️ Loose Battery Connections Found During Inspection! ⚠️🔋

During a routine inspection, our technician discovered loose battery cable connections. While this may seem like a minor issue, loose battery terminals can create major electrical problems throughout the truck, leading to intermittent faults, poor performance, and even unexpected breakdowns. 🚛

💡 Why are battery connections so important?
Your truck’s batteries supply power to every electronic control module (ECM) on the vehicle. A clean, tight connection ensures the engine, transmission, aftertreatment system, ABS, and other electronic components receive stable voltage.

⚠️ What can loose battery connections cause?
• Voltage drops or unstable electrical power ⚡
• Hard starting or no-start conditions 🔑
• Intermittent warning lights on the dashboard 🚨
• Communication faults between control modules 💻
• False or intermittent diagnostic trouble codes (DTCs) 📋
• Unexpected engine or transmission performance issues 🚛

👉 Common symptoms drivers may notice:
• Truck occasionally won’t start
• Random fault codes that come and go
• Dashboard lights flickering
• Electronics resetting unexpectedly
• Inconsistent engine performance

🔍 Did you know?
Many electrical fault codes aren’t caused by failed sensors or expensive components—they’re actually the result of poor battery connections or low system voltage. That’s why checking battery terminals is one of the very first steps in a proper diagnostic process.

💡 Why inspections matter:
A simple battery connection inspection can prevent unnecessary parts replacement, reduce downtime, and save thousands of dollars in repair costs. Catching loose connections early helps ensure your truck’s electrical system operates safely and reliably.

✅ At TAT Express, we don’t just read fault codes—we diagnose the root cause. Our technicians perform comprehensive electrical inspections to ensure your batteries, cables, and connections are in top condition, keeping your truck dependable mile after mile.

📍 TAT Express – Dallas, TX
4140 Langdon Rd, Dallas, TX 75241
📞 972-225-3017
🌐 https://tatexpressinc.com/
✅ Semi-Truck, Trailer & RV Repair Specialists
✅ Built on Integrity. Striving for Excellence

⛽🔧 Volvo D13 Injector Cups Replaced to Resolve Fuel System Issues! 🔧⛽During the diagnosis of this Volvo D13 engine, our ...
07/21/2026

⛽🔧 Volvo D13 Injector Cups Replaced to Resolve Fuel System Issues! 🔧⛽

During the diagnosis of this Volvo D13 engine, our technicians identified failed injector cups as the source of the truck’s fuel system issues and engine jerking. To restore proper engine performance and reliability, the injector cups were replaced according to manufacturer specifications. ✅🚛

💡 What are injector cups?
Injector cups (also known as injector sleeves) are installed in the cylinder head and provide a sealed passage for the fuel injectors. They create a barrier between the fuel system and the engine’s cooling system, ensuring both systems operate independently without contamination.

⚠️ Why do injector cups fail?
• Normal wear over time ⏳
• Heat and pressure cycles 🌡️
• Corrosion inside the cylinder head 🌊
• Damaged seals or improper installation 🔧
• High engine mileage 🚛

👉 Common symptoms of failing injector cups:
• Engine jerking or hesitation 🚨
• Rough idle 🔊
• Loss of power 📉
• Hard starting 🔑
• Fuel system performance issues ⛽
• Coolant contamination or unexplained coolant loss 💧

💡 Why replacing injector cups is important:
Ignoring worn or leaking injector cups can lead to fuel system contamination, injector damage, poor engine performance, and more expensive repairs down the road. Replacing them at the first signs of failure helps restore smooth operation, improve reliability, and protect critical engine components.

✅ At TAT Express, we use thorough diagnostic procedures to pinpoint the root cause of engine performance concerns—not just the symptoms. Our experienced technicians ensure every repair is completed correctly, helping keep your truck dependable and ready for the road.

📍 TAT Express – Dallas, TX
4140 Langdon Rd, Dallas, TX 75241
📞 972-225-3017
🌐 https://tatexpressinc.com/
✅ Semi-Truck, Trailer & RV Repair Specialists
✅ Built on Integrity. Striving for Excellence

07/21/2026

🔩🚛 Transmission Found with Missing and Loose Flywheel Housing Bolts! 🚛🔩

During an inspection on this Volvo truck, our technician discovered that several flywheel housing bolts were missing, and others were loose. As a result, the transmission was no longer making full contact with the flywheel housing—a serious condition that can lead to costly drivetrain damage if not corrected immediately. ⚠️

💡 What do the flywheel housing bolts do?
These bolts securely fasten the transmission to the engine’s flywheel housing (bell housing), ensuring the transmission remains properly aligned with the flywheel and clutch assembly. This precise alignment is critical for smooth power transfer and the longevity of drivetrain components.

⚠️ What can happen when bolts are missing or loose?
• Loss of proper transmission alignment 📏
• Excessive vibration throughout the drivetrain 🚛
• Premature wear of the clutch, pilot bearing, and input shaft ⚙️
• Damage to the flywheel housing or transmission case 💥
• Risk of catastrophic transmission failure if left unrepaired ❌

👉 Common symptoms drivers may notice:
• Unusual vibration while driving 🔊
• Clunking or knocking noises between the engine and transmission 🔧
• Difficulty shifting gears ⚠️
• Transmission movement under load 🚨
• Oil leaks caused by excessive movement 💧

🔍 Did you know?
Even a few missing or loose mounting bolts can create a small gap between the transmission and the flywheel housing. That slight movement places tremendous stress on the remaining bolts and drivetrain components, often leading to broken hardware, damaged housings, or expensive transmission repairs.

💡 Why inspections are so important:
Problems like this often develop gradually and may go unnoticed until major damage occurs. Routine inspections can identify loose or missing hardware before it causes transmission misalignment, saving thousands of dollars in repairs and preventing unexpected downtime.

✅ At TAT Express, we perform detailed drivetrain inspections to ensure every critical component is properly secured and aligned. Catching issues early helps protect your truck, reduce repair costs, and keep you safely on the road.

📍 TAT Express – Dallas, TX
4140 Langdon Rd, Dallas, TX 75241
📞 972-225-3017
🌐 https://tatexpressinc.com/
✅ Semi-Truck, Trailer & RV Repair Specialists
✅ Built on Integrity. Striving for Excellence

07/21/2026

🌡️🌀 Fan Clutch Test Passed – Engaged at 210°F! 🌀🌡️

During a cooling system diagnostic, our technician performed a fan clutch engagement test and confirmed that the fan clutch activated at approximately 210°F, exactly as it should. This test helps verify that the engine cooling fan engages when temperatures rise, preventing the engine from overheating under heavy loads. ✅🚛

💡 What does the fan clutch do?
The fan clutch controls when the engine cooling fan engages. Instead of running at full speed all the time, it activates only when additional airflow is needed through the radiator, helping maintain the proper engine operating temperature while improving fuel efficiency.

⚠️ Why is testing the fan clutch important?
A fan clutch that engages too late—or not at all—can allow engine temperatures to climb rapidly, especially when hauling heavy loads, climbing steep grades, or idling for extended periods.

👉 Signs of a faulty fan clutch may include:
• Engine overheating 🌡️
• Coolant temperature running higher than normal ⚠️
• Poor cooling performance while idling 🚛
• Excessive fan noise or a fan that never disengages 🔊
• Reduced fuel economy ⛽

🔍 Did you know?
A properly functioning fan clutch only engages when the engine reaches a specific temperature. This allows the engine to warm up efficiently while providing maximum cooling exactly when it’s needed.

💡 What does engaging at 210°F mean?
In this test, the fan clutch responded at the correct temperature, confirming that it is operating as designed and helping the engine maintain safe operating temperatures under demanding conditions.

✅ At TAT Express, we don’t just replace parts—we verify that critical components like the fan clutch are functioning correctly through comprehensive diagnostic testing. Accurate testing helps prevent overheating and keeps your truck performing at its best.

📍 TAT Express – Dallas, TX
4140 Langdon Rd, Dallas, TX 75241
📞 972-225-3017
🌐 https://tatexpressinc.com/
✅ Semi-Truck, Trailer & RV Repair Specialists
✅ Built on Integrity. Striving for Excellence

07/21/2026

💧🔍 Heater Core Hose Clamps Found Leaking During Inspection! 🔍💧

During a routine cooling system inspection, our technician discovered coolant leaking from the heater core hose clamps. While hose clamps may seem like small components, they play a vital role in keeping the cooling system sealed and maintaining the proper coolant pressure. Even a minor leak can turn into a major repair if left unaddressed. 🚛⚠️

💡 What do heater core hose clamps do?
Heater core hose clamps secure the coolant hoses to the heater core and cooling system fittings, preventing coolant from escaping while the engine is operating under pressure.

⚠️ What can cause hose clamps to leak?
• Loose or worn clamps 🔧
• Aging or deteriorated coolant hoses ⏳
• Corrosion around fittings 🌊
• Heat cycles causing hoses to shrink or harden 🌡️
• Vibration from daily truck operation 🚛

👉 Common symptoms of leaking heater core hose clamps:
• Low coolant level 💧
• Coolant dripping under the truck 🚨
• Sweet smell of coolant 👃
• Heater not performing as efficiently 🔥
• Engine running hotter than normal 🌡️

🔍 Did you know?
A slow coolant leak from a hose clamp can be easy to overlook because it may only leak when the cooling system is hot and pressurized. Over time, that small leak can lower the coolant level enough to increase the risk of engine overheating.

💡 Why prompt repairs matter:
Replacing or tightening leaking hose clamps before they fail completely helps maintain cooling system pressure, prevents coolant loss, protects the heater core, and reduces the risk of costly engine damage caused by overheating.

✅ At TAT Express, every cooling system inspection is performed with attention to detail. We identify even the smallest coolant leaks to help keep your truck reliable, efficient, and on the road where it belongs.

📍 TAT Express – Dallas, TX
4140 Langdon Rd, Dallas, TX 75241
📞 972-225-3017
🌐 https://tatexpressinc.com/
✅ Semi-Truck, Trailer & RV Repair Specialists
✅ Built on Integrity. Striving for Excellence

🔧🚛 Worn Carrier Bearing Replaced to Restore a Smooth Driveline! 🚛🔧During our inspection, our technician found that the c...
07/20/2026

🔧🚛 Worn Carrier Bearing Replaced to Restore a Smooth Driveline! 🚛🔧

During our inspection, our technician found that the carrier bearing was worn out and no longer properly supporting the driveshaft. To restore safe and reliable operation, the worn carrier bearing was replaced before it could lead to more serious driveline damage. ⚙️✅

💡 What is a carrier bearing?
The carrier bearing is a critical component that supports the driveshaft on trucks with a two-piece driveshaft. It helps keep the driveshaft properly aligned while absorbing vibration and allowing smooth power transfer from the transmission to the drive axle.

⚠️ What causes a carrier bearing to wear out?
• Normal wear and high mileage ⏳
• Constant driveline vibration 🚛
• Torn or deteriorated rubber support 🔧
• Heavy loads and harsh road conditions 🛣️
• Misaligned driveline components ⚙️

👉 Common symptoms of a worn carrier bearing:
• Driveline vibration, especially at highway speeds 📳
• Clunking or thumping noises when accelerating or shifting 🔊
• Squealing or growling sounds from underneath the truck ⚠️
• Excessive driveshaft movement 🔩
• Premature wear on other driveline components 📉

🔍 Did you know?
A failing carrier bearing can place additional stress on the driveshaft, U-joints, and transmission. Replacing it early can help prevent costly driveline repairs and unexpected breakdowns.

💡 Why this repair matters:
A properly functioning carrier bearing keeps the driveshaft stable, reduces vibration, improves driving comfort, and helps ensure efficient power delivery throughout the drivetrain.

✅ At TAT Express, we perform detailed driveline inspections to identify worn components before they become major failures. Our goal is to keep your truck operating safely, smoothly, and reliably—mile after mile.

📍 TAT Express – Dallas, TX
4140 Langdon Rd, Dallas, TX 75241
📞 972-225-3017
🌐 https://tatexpressinc.com/
✅ Semi-Truck, Trailer & RV Repair Specialists
✅ Built on Integrity. Striving for Excellence

🛠️💧 Pinion Seal Replaced Due to an Active Leak! 💧🛠️During our inspection, our technician found an active leak coming fro...
07/20/2026

🛠️💧 Pinion Seal Replaced Due to an Active Leak! 💧🛠️

During our inspection, our technician found an active leak coming from the differential pinion seal. To prevent further lubricant loss and protect the drivetrain, the pinion seal was replaced, helping restore the differential’s ability to operate safely and efficiently. 🚛🔧

💡 What is a pinion seal?
The pinion seal is located where the driveshaft connects to the differential. Its job is to keep the differential gear oil sealed inside while preventing dirt, water, and other contaminants from entering the housing.

⚠️ What can cause a pinion seal to leak?
• Normal wear and aging ⏳
• Worn pinion bearings ⚙️
• Excessive driveline vibration 🚛
• Damaged or grooved yoke surface 🔩
• High mileage or improper installation 🔧

👉 Common symptoms of a leaking pinion seal:
• Gear oil dripping beneath the differential 💧
• Oil residue around the driveshaft yoke ⚠️
• Low differential fluid level 📉
• Whining or humming noises from the rear differential 🔊
• Burning gear oil smell 🌡️

🔍 Did you know?
An active pinion seal leak may start as only a few drops, but over time it can significantly lower the differential’s gear oil level. Without proper lubrication, the ring and pinion gears and bearings can overheat, wear prematurely, and potentially suffer catastrophic failure.

💡 Why replacing the pinion seal is important:
Replacing a leaking pinion seal helps maintain the proper gear oil level, protects expensive differential components, prevents contamination, and extends the life of your drivetrain.

✅ At TAT Express, we thoroughly inspect drivetrain components and repair leaks before they become major failures, helping keep your truck reliable and on the road.

📍 TAT Express – Dallas, TX
4140 Langdon Rd, Dallas, TX 75241
📞 972-225-3017
🌐 https://tatexpressinc.com/
✅ Semi-Truck, Trailer & RV Repair Specialists
✅ Built on Integrity. Striving for Excellence

07/20/2026

💧🔧 Injector Cups Found Leaking Coolant! 🔧💧

During our inspection, our technician discovered that the injector cups were leaking coolant. While injector cups are small components inside the cylinder head, they play a critical role in keeping the engine’s coolant and fuel systems completely separated. When they begin to leak, they can lead to serious engine problems if not repaired promptly. 🚛⚠️

💡 What are injector cups?
Injector cups (also called injector sleeves) are installed in the cylinder head and create a sealed barrier between the engine coolant and the fuel injector. Their job is to prevent coolant from entering the fuel system while ensuring a proper seal around each injector.

⚠️ What can cause injector cups to leak?
• Normal wear over time ⏳
• Corrosion or pitting inside the cylinder head 🌊
• Failed sealing O-rings or sealant 🔧
• Engine overheating 🌡️
• Improper installation during previous repairs ⚙️

👉 Common symptoms of leaking injector cups:
• Unexplained coolant loss 💧
• Coolant contamination in the fuel system ⛽
• Hard starting or rough engine performance 🚨
• White exhaust smoke 🌫️
• Engine misfires or reduced power 📉
• Low coolant warnings ⚠️

🔍 Did you know?
A leaking injector cup may not always create an external coolant leak. In many cases, coolant leaks internally, making the problem much harder to detect without a thorough inspection. Catching it early can prevent extensive engine damage and costly repairs.

💡 Why replacing leaking injector cups is important:
Ignoring a leaking injector cup can allow coolant to contaminate the fuel system, affect injector performance, and lead to expensive damage to injectors, the cylinder head, or other engine components. Addressing the issue early helps restore engine reliability and prevent major failures.

✅ At TAT Express, we use thorough diagnostic procedures to identify internal coolant leaks and repair them correctly the first time. Our goal is to keep your truck running efficiently while helping you avoid unexpected downtime.

📍 TAT Express – Dallas, TX
4140 Langdon Rd, Dallas, TX 75241
📞 972-225-3017
🌐 https://tatexpressinc.com/
✅ Semi-Truck, Trailer & RV Repair Specialists
✅ Built on Integrity. Striving for Excellence

Address

4140 Langdon Road
Dallas, TX
75241

Opening Hours

Monday 8am - 6pm
Tuesday 8am - 6pm
Wednesday 8am - 6pm
Thursday 8am - 6pm
Friday 8am - 6pm

Telephone

+19722253017

Website

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