SPECIFICATIONS
Page 329
ENGINE GASKETS,
LUBRICANTS AND SEALANTS
Gasket and Seal Reuse
Some gaskets and seals must be discarded if
removed during service. The following table
describes the components and their limits.
Components Examples
Reusable
Limit Reuse Recommendations
Gaskets (steel) Cylinder head Do not reuse Discard the old gasket and
substitute new if the head is
removed.
Gaskets (hot) Exhaust manifold, turbocharger,
EGR system, DPF system
Do not reuse Discard old gaskets and
substitute new if associated
components are removed.
Rubber gaskets (special) Sealing strip (cooling duct cover,
cylinder head cover, oil pan and
timing gear cover)
No limit if no
damage and no
leaks
Remove old sealant from the T
joints.
Clean the surfaces.
Apply fresh sealant.
Rubber gaskets (standard) O-rings and sealing rings No limit if no
damage and no
leaks
Bonded seals, steel/rubber gasket Nipples, hollow screws and oil
filter housing
No limit if no
damage and no
leaks
Valve seals Valve stems No limit if no
damage and no
leaks
Discard old seals and substitute
new if the gasket is removed.
Crankshaft seals Do not reuse Discard old seals and substitute
new if removed. Do not apply oil
on the inside or outside diameters
of the seal during assembly.
SEALS MUST BE DRY
MOUNTED.
Sealant agent (MACK-approved
sealant)
Sealing between:
Timing Gear Plate and Cylinder
Block
Flywheel Housing and Timing
Gear Plate
Front Cover and Cylinder Block
Timing Gear Cover and Gear
Plate
Do not reuse Remove the old sealant.
Clean the surfaces.
Apply fresh sealant.
Important: Remove the old
sealant from the T joints and
apply fresh.
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