TM 10-3950-672-24-2
External head gasket leaks can be detected visually.
Liquid soap can be used to locate external leaks.
Valve Seal Wear
Worn valve seals are typically detected by excessive
smoke at idle or when the engine is unloaded when the
vehicle is going down hill. Verify the condition by
removing the valve spring and inspecting the seals.
Hardening of the material and wear or damage to the
sealing surfaces will cause the seal to leak (refer to
page 5-255 for replacement instructions).
5-173