A Series Diesel Engine Base Engine Components 160
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 surface will cause the seal to leak (refer to
page 219 for replacement instructions).
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