*: Part to be sealed with a form-in-place gasket (FIPG)
FORM-IN-PLACE GASKET (FIPG)
This engine has several areas where the form-in-place gasket (FIPG) is used for sealing.
To ensure that the FIPG fully serves its purpose, it is necessary to observe some precautions
when applying it. Bead size, continuity and location are of paramount importance. Too thin a bead could
cause leaks. Too thick a bead, on the other hand, could be squeezed out of location, causing
blocking or narrowing of fluid passages. To prevent leaks or blocking of passages, therefore,
it is absolutely necessary to apply the FIPG evenly without a break, while observing the correct
bead size. FIPG hardens as it reacts with the moisture in the atmospheric air, and it is usually
used for sealing metallic flange areas.
REMOVAL OF FIPG SEALED PARTS
Parts sealed with a FIPG can be easily removed without need for the use of a special method.
In some cases, however, the FIPG in joints may have to be broken by tapping parts with a mallet
or similar tool. You can also tap a flat, thin gasket scraper into the joint to break the FIPG,
taking extreme care not to damage the mating surfaces.
CLEANING FIPG APPLICATION SURFACE
Thoroughly remove all substances deposited on the FIPG application surface, using a gasket
scraper or wire brush. Make sure that the FIPG application surface is flat and smooth. Also
make sure that the surface is free from oils, greases and foreign substances. Do not fail to
remove old FIPG that may remain in the fastener fitting holes.
APPLICATION OF FIPG
Applied FIPG bead should be of the specified size and free of any break. FIPG can be wiped
away unless it has completely hardened. Install the mating parts in position while the FIPG
is still wet (in less than 15 minutes after application). Do not allow FIPG to spread beyond
the sealing areas during installation. Avoid operating the engine or letting oils or water come
in contact with the sealed area before a time sufficient for FIPG to harden (approximately one
hour) has passed. FIPG application method may vary from location to location. Follow the instruction for
each particular case described later in this manual.