4G63T Engine Used

Common Mitsubishi engine problems and How to Fix Them

Good Repairs from Genuine Sellers of Quality Used Mitsubishi Engines


Introduction: Why This Is Important to Used Mitsubishi Engine Buyers

Mitsubishi engine problems. Buying a used engine is an excellent, budget-friendly solution if your automobile’s engine breaks down or needs to be replaced. Mitsubishi engines, which have been known for their power and longevity, are highly sought after by drivers worldwide. Nevertheless, as with any second-hand automobile part, used Mitsubishi engines will have certain flaws—especially if they were not properly cared for by their previous owners. Mitsubishi engine problems

That’s where we come in. We don’t merely retail used Mitsubishi engine —we test, inspect, and verify them so you enjoy reliable performance and enduring value. In this how-to guide article, we explain some of the most common problems in used Mitsubishi engines and provide guidance on how to fix them, or when it would be better to replace the whole engine. Mitsubishi engine problems

Whether you’re an automotive mechanic, do-it-yourself driver, or just someone looking to save money on a reliable replacement, you’ll get the information you need—and why buying from a reputable used engine supplier like us is the smart choice. Mitsubishi engine problems


1. Oil Leaks in Used Mitsubishi Engines

🚩 The Problem:

Reconditioned Mitsubishi engines, especially the older models such as the 4G63 or 6G72, will oil leak around the valve cover gasket, crankshaft seals, or oil pan. Mitsubishi engine problems

🛠️ The Fix:

  • Valve Cover Gasket Replacement: A replacement gasket kit is extremely inexpensive and can usually be done with simple tools.
  • Seal Replacement: Crankshaft or camshaft seal replacement involves a longer job, but it’s a standard procedure.
  • Prevention Tip: Drive your car on synthetic oil and have it changed regularly.

✅ What We Do:

We inspect for oil leaks prior to offering any used Mitsubishi engine for sale and replace faulty seals or gaskets when required. We sell leak-free, pre-tested engines so you won’t be left with someone else’s problem. Mitsubishi engine problems


2. Overheating Issues

🚩 The Issue:

Overheating is commonly caused by:

  • Blockages within radiators
  • Faulty water pumps
  • Warped cylinder heads due to prior abuse

Late Mitsubishi engines are also highly susceptible to heat damage if cooling systems were bypassed.

🛠️ The Solution:

  • Drain and flush the cooling system and replace the radiator if plugged.
  • Replace the water pump and thermostat and check.
  • Compression test the engine to determine if the head has been warped or compromised parts.

✅ What We Do:

We check all of our engines for thermal efficiency and conduct a cooling system integrity test. If an engine shows signs of prior overheating damage, we don’t sell it—period. Mitsubishi engine problems


3. Low Compression in Cylinders

🚩 The Problem:

Compression loss in older Mitsubishi engines is caused by:

  • Worn piston rings
  • Cracked valves
  • Blown head gaskets

Symptoms include hard starting, poor acceleration, and increased oil consumption.

🛠️ The Fix:

  • Do a wet/dry compression test to find out the issue.
  • Head gaskets or valves replaced where needed.
  • Rebuild if the lower end is badly worn.

✅ What We Do:

Every one of our used Mitsubishi engines is compression and leak-down tested. Only those with strong, even compression in all of the cylinders are presented for sale. Mitsubishi engine problems


4. Timing Belt Failures

🚩 The Problem:

Most Mitsubishi engines, including the popular 4G63 engine, have a timing belt instead of a chain. Belts will break down or crack after a period and lead to destruction in the engine if the engine is interference-type.

🛠️ The Fix:

  • Replace timing belts at every 60,000 to 100,000 km.
  • Replace tensioner and water pump at service.

✅ What We Do:

Before shipping, we check the condition of the timing belt and replace it with a brand new OEM-spec belt if there is any sign of wear or aging. That’s our value-added inspection. Mitsubishi engine problems


5. Worn Engine Mounts

🚩 The Problem:

Engine mounts wear out with age and use, especially in turbo engines because of higher engine motion.

🛠️ The Repair:

  • Replace damaged mounts with OEM or improved polyurethane parts.
  • Check transmission mounts as well since these also wear simultaneously.

✅ What We Do:

Our sale mechanics inspect engine mounts and replace them if they exhibit even a trace of cracking, sagging, or excessive wear. Mitsubishi engine problems


6. Carbon Deposit in Intake or Valves

🚩 The Problem:

Sideline direct inject Mitsubishi engines like the 4B11T are more likely to carbon deposit, which destroys fuel economy and performance. Mitsubishi engine problems

🛠️ The Fix:

  • Do a walnut blasting on intake valves to clean out buildup.
  • Use fuel additives and routine maintenance.

✅ What We Do:

We completely clean out any intake system that has signs of excessive buildup. When necessary, we also replace re-used EGR components and injectors and clean them before selling the engine.


7. Excessive Engine Noise or Knocking

🚩 The Problem:

High-mileage older used engines may experience:

  • Rod knock
  • Lifter noise
  • Worn timing components

🛠️ The Fix:

  • Minor noise: engine treatment or high-mileage oil.
  • Rod knock: the engine must be rebuilt or replaced.

✅ What We Do:

Our engines undergo sound analysis and vibration testing. If it knocks, we don’t take it. We’re providing quiet, clean-sounding Mitsubishi engines, not bombs to time. Mitsubishi engine problems


8. Sensor Malfunctions (O2 Sensor, MAF, Knock Sensor)

🚩 The Problem:

Old sensors are too commonly neglected. An old Mitsubishi engine could have old sensors that result in:

  • Rough idling
  • Poor fuel economy
  • Check engine light (CEL)

🛠️ The Fix:

  • Replace defective sensors
  • Scan the ECU to clear codes after install

✅ What We Do:

We check for failing major sensors and only supply functioning parts with our used Mitsubishi engines. If a sensor shows failure, it is replaced before shipping. Mitsubishi engine problems


9. PCV System Failures and Oil Blow-By

🚩 The Problem:

PCV systems clog up, and there is too much pressure and oil blow-by into the intake.

🛠️ The Fix:

  • Replace PCV valve
  • Clean entire system up
  • Use an oil catch can on turbos

✅ What We Do:

Oil blow-by indicators are noted, cleaned, and tested again on engines. We make sure every engine departs with a functional PCV system. Mitsubishi engine problems


10. Turbocharger Wear (on Turbo Models like Evo, VR4, etc.)

🚩 The Problem:

Turbocharged Mitsubishi engines like the 4G63T and 6A13TT are susceptible to:

  • Frayed bearings
  • Shaft play
  • Oil leaking seals

🛠️ The Fix:

  • Rebuild or replace the turbo
  • Use proper oil feed and return lines
  • Replace with newer turbos if desired

✅ What We Do:

Turbochargers we sell are checked for oil leaks and shaft play. We also exchange damaged turbos with rebuilt OEM units or good quality aftermarket ones, if possible.


When to Fix and When to Replace a Whole Engine

ConditionFix ✅Replace ❌
Small oil leaks
Head gasket blowout❌ (if heat warp occurred)
Cracked block
Rod knock
Burnt valves❌ (if isolated)

, we help you make the smart choice. If your current engine has more issues than it is worth, our clean, pre-tested used Mitsubishi engine from inventory will save your cash and time.


Why Choose Us for Your Used Mitsubishi Engine?

The following are reasons our engines are the smart choice:

  • ✅ Inspected thoroughly prior to sale
  • ✅ Compression tested and leak-free
  • ✅ No overheating, oil leaks, or unusual noises
  • ✅ Warranty options available
  • ✅ World-wide rapid shipping

We carry all of the most common Mitsubishi engine models:

  • 4G63
  • 4B11T
  • 6G72
  • 4G93
  • 4D56 (Diesel)
  • 6A13TT
  • And more

Customer Reviews

“I bought a 4G63 from [Your Company Name]—installed it in my Evo III and it purrs like a kitten. Clean, no leaks, no hassle.”
Jason M., South Africa

“They helped me locate a second-hand Mitsubishi 4D56 diesel to suit my Pajero. It was compression-tested and had new gaskets. Superb service!”
Miguel R., Peru


Conclusion: Buy Used, But Buy Smart

Used Mitsubishi engines can be a part of your life, delivering reliability, power, and economy—but only if you shop carefully. The issues we discussed today do not have to be deal-breakers. With careful inspection by specialists, timely maintenance, and a good supplier, you may get years of service from your engine.

With us, you take the guesswork out of buying a used Mitsubishi engine. We’ve already tested, cleaned, and readied it—so you can just install and drive.


📞 Need a quote or want to browse inventory?

Contact us today and find the perfect used Mitsubishi engine for your car, truck, or SUV!

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