GMC T Series 1994 Repair Manual page 303

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 overtighten.
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.
CYLINDER BORES, PISTONS, RINGS, AND
M EASURING CYLINDER BORE
TAPER AND OUT-OF-ROUND
(ALL ENGINES)
Tool Required:
J 8087 Cylinder Bore Gage (or equivalent)
• If one or more cylinder bores are rough, scored or
worn beyond limits, it will be necessary to smooth
or true up such bores to fit new pistons.
• No attempt should be made to cut down oversize
pistons to fit cylinder bores as this will destroy the
surface treatment and affect the weight. The smal­
lest possible oversize service pistons should be
used and the cylinder bores should be honed to
size for proper clearances.
1. Refer to " Specifications" in the proper section for
tolerances.
2. Set the gage so the thrust pin must be forced in
about 7 mm (1/4 inch) to enter the gage in the
cylinder bore.
3. Center the gage in the cylinder and turn the dial to "0."
4. Carefully work the gage up and down the cylinder
to determine taper and turn it to different points
a ro u n d th e c y lin d e r w a ll to d e te rm in e th e
out-of-round condition (figure 1). Measure the bore
both parallel to and at right angles to the engine
centerline. Measure at the top, middle, and bottom
of the bore and note the readings.
5. Recondition the cylinder bore as necessary. Refer
to " Cylinder Bore Reconditioning."
CYLINDER BORE
RECO NDITIO NING
(2.2L ENG INES)
1. Measure the cylinder bore for out of round and
taper as outlined previously.
2. Refer to (figure 2). Measure dimension "A" at 13
mm (1/2 inch) below the head gasket surface.
Measure dimension " B" at 100 mm (4 inches)
below the head gasket surface.
CONNECTING RODS
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.
REPLACING ENG INE GASKETS
CAUTION: Composite type gaskets are used
in some areas of the engine assembly. These
gaskets have a thin metal core. Use caution
when removing or handling composite gas­
kets to help avoid personal injury.
• Cylinder bores can be measured by setting the
cylinder gage dial at zero (in the cylinder) at the
point of desired measurement. Lock the dial
indicator at zero before removing it from the