G643 (E) Service Manual Chapter 3. Engine Mechanical System 46
Use Of Rtv Sealer And Anaerobic Gasket
Eliminator
Two types of sealer are commonly used in the
engines covered by this manual. These are RTV
sealer and anaerobic “gasket eliminator” sealer. It is
important that these sealers be applied properly and
in their proper place to prevent oil leaks. THE TWO
TYPES OF SEALERS ARE NOT INTER-
CHANGEABLE. Use the sealer recommended in the
procedure.
RTV (room temperature vulcanization) sealer is
used where a non-rigid part is assembled to a rigid
part. Common examples are oil pans and rocker
covers. Anaerobic gasket eliminator hardens in the
absence of air. This sealer is used where two rigid
parts (such as castings) are assembled together.
When two rigid parts are disassembled and sealer
or gasket is readily noticeable, the parts were
probably assembled using gasket eliminator.
Using RTV Sealer
1. Do not use RTV when extreme temperatures are
expected, such as exhaust manifold, head
gasket or where gasket eliminator is specified.
2. When separating components sealed with RTV,
use a rubber mallet and “bump” the part
sideways to shear the RTV sealer. “Bumping”
should be done at bends or reinforced areas to
prevent distortion of parts. RTV is weaker in
shear (lateral) strength than in tensile (vertical)
strength.
NOTICE: Attempting to pry or pull components apart
may result in damage to the part.
3. Surfaces to be resealed must be clean and dry.
Remove all traces of oil and RTV with a
chlorinated solvent (GM P/N 1050454 or
equivalent). Do not use petroleum cleaners such
as mineral spirits. They leave a film onto which
RTV will not stick.
4. Apply RTV to one of the clean surfaces. Use a
bead size as specified in the procedure. Run the
bead to the inside of any bolt holes. Do not allow
the sealer in any blind threaded holes, as it may
prevent the bolt from seating properly or cause
damage when the bolt is tightened.
5. Assemble while RTV is still wet (within 3
minutes). Do not wait for RTV to skin over.
6. Torque bolts to specifications. Do not overtorque.
Using Anaerobic Gasket Eliminator
1. Clean surfaces to be resealed with a chlorinated
solvent (GM P/N 1050454 or equivalent) to
remove all oil, grease, and old material.
2. Apply a continuous bead of gasket eliminator to
one flange.
3. Spread the bead evenly with your finger to get a
uniform coating on the complete flange.
4. Assemble parts in the normal manner and torque
immediately to specifications.
IMPORTANT: Anaerobic sealed joints that are
partially torqued and allowed to cure more than
five minutes may result in incorrect shimming of
the joint.
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