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1987-1990 Jeep Cherokee XJ Comanche MJ 4.0 I6 Complete Long Block Engine

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1987-1990 Jeep Cherokee XJ Comanche MJ 4.0 I6 Complete Long Block Engine For Sale

If you’re in the market for locating a good second-hand Jeep motor for sale, look no further than Used Engine Finder. We allow you to speak to a database of Jeep dismantlers and engine importers right away, so you can get the best bargain for the ideal used engine.

Looking for a motor is no longer necessary thanks to Used Engine Finder. We just require information about what exactly you need, and our engine supplierswill respond with estimates. And because we deal directly with them, you can be sure you’re receiving the very best price.


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Best Engine Replacement Procedure
  1. Swap the engine’s oil, fuel and oil filters, and coolant.
  2. Install new engine and external coolers if existing.
  3. Cleanse the cooling system thoroughly, then replace the water pump.
  4. Renew necessary hoses and belts.
  5. Install a new timing belt, spark plugs, and wires.
  6. Replace essential gaskets and seals, focusing on the oil pan, front, and rear main seals.
  7. Clear the vehicle’s computer codes before engine installation.
  8. Ensure the replacement engine matches the original specifications.
  9. Transfer exhaust manifolds, mounts, distributor, and sensors from the old engine.
  10. Disable fuel and ignition before ignition to prime the oil.
  11. Ensure no plugs or tape remain on the engine before installation.
7 Common Mistakes to AVOID!
  1. Not resetting the vehicle’s computer codes before installation.
  2. Skipping the step of adding engine oil before the first startup.
  3. Forgetting to deactivate the fuel and ignition systems, essential for priming the oil.
  4. Ignoring the replacement of the oil cooler or the radiator’s integrated oil cooler.
  5. Overlooking the cleaning of the radiator and checking the operation of the cooling fans.
  6. Not swapping out the flywheel and its securing bolts.
  7. Trying to initiate the engine’s first run without proper priming.
Warranty Info
Review our Warranty, Return & Exchange policies before ordering. Standard Warranty: 30 days parts replacement. Extended Warranty: Optional 90 days. No labor costs covered. Defective parts may be replaced or refunded. Read more.