OM617 Diesel Jeep Cherokee | Head Gasket Replacement Prep

Published on September 10, 2020
Duration: 8:34

This video details the preparation for a head gasket replacement on an OM617 diesel engine swapped into a Jeep Cherokee XJ. The presenter, experienced with diesel conversions, identifies a coolant leak between the cylinder head and block, likely due to a failed head gasket. He emphasizes the importance of professional cylinder head services (pressure checking, magnafluxing, decking) after a rebuild, even if initial measurements appear fine, especially when increasing boost levels. The video includes B-roll of a cylinder head removal from a spare engine and discusses the benefits of ARP studs for increased reliability.

Quick Summary

Preparing an OM617 diesel Jeep Cherokee for a head gasket replacement involves diagnosing coolant leaks, understanding the impact of increased boost, and prioritizing professional cylinder head services like pressure testing, magnafluxing, and decking. Using ARP studs is also a recommended upgrade for enhanced reliability and sealing under higher pressures.

Chapters

  1. 00:00Introduction & Project Update
  2. 00:24Reason for Current Work
  3. 00:33Mishimoto Radiator Install
  4. 00:57Coolant Leak Diagnosis
  5. 01:14Lesson Learned: Head Gasket Failure
  6. 01:28Importance of Cylinder Head Machining
  7. 01:50Spare OM617 Engine Prep
  8. 02:11Head Gasket Failure Analysis
  9. 02:28Impact of Increased Boost
  10. 02:55Cylinder Head Removal B-Roll
  11. 03:50Head Removal Tips
  12. 04:12Spare Engine Details
  13. 04:38New Head Gasket on Spare Engine
  14. 04:44Reason for Spare Engine Failure
  15. 04:59Instagram & Channel Plans
  16. 05:18Outro

Frequently Asked Questions

What are the key steps for preparing a Jeep Cherokee XJ with an OM617 diesel for a head gasket replacement?

Preparation involves diagnosing the coolant leak, understanding that increased boost can exacerbate gasket issues, and crucially, planning for professional cylinder head services like pressure testing, magnafluxing, and decking before reinstallation. Using ARP studs is also recommended for a more secure seal.

Why is it important to send a cylinder head to a machine shop after a diesel engine rebuild, even if it measured fine initially?

Even if initial measurements are within spec, a cylinder head can warp or have microscopic cracks that only become apparent under pressure or heat. Machining ensures a perfectly flat surface for the head gasket, preventing leaks, especially with higher boost levels common in diesel conversions.

What are the benefits of using ARP studs for an OM617 diesel engine head gasket replacement?

ARP studs provide a more consistent and reliable clamping force on the cylinder head compared to standard torque-to-yield bolts. This increased clamping force helps prevent the cylinder head from lifting under higher boost pressures, reducing the risk of head gasket failure and coolant leaks.

What are common causes of coolant leaks in OM617 diesel engines swapped into Jeep Cherokees?

Common causes include head gasket failure, often exacerbated by increased boost pressure from turbochargers. Cylinder head warpage, even if not initially detected, can also lead to leaks, particularly around coolant jackets near the cylinder walls.

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