Chevrolet CAMARO 1979 Service Manual page 521

Evên Fire V.6 647-15
NEOPRENE COMPOSIlION SEAL
F i g 6 4 7 - 2 8 . . l n s t a l l i n g A e ê r B e a r i n g O i l S e ê l
Installation of Rear E6aring Oil SEals
Braided fâbric seals are pressed into grooves formed in
cmnkcase and reâr bearing câp to reff of the oil collecting
groove, to seal against leakage ofoil around the crankshaft-
See Fig. 647-28.
A new braided fabdc seal cân be installed in crankcase
only when crânkshaft is remov€d, but it can be repaired
while crankshaft is installed, âs oullined under Rear Main
B€âring whenever the câp is removed. Remove old seal and
place new seal in groove with both ends projecting âbove
parting surface of cap. Force seal into groove by rùbbing
down with hammer handle or smooth stick until sۉl
projects above the groove not more than 1/16" (1.6mm).
Cut ends offflush with surfâce ofcap, using sharp knife or
razor blade. See Fig. 647-28.
The engine must be operated ât dorv speed when first
strted after a new braided seal is instâlled.
Neoprene composil'on seals are placed in groole< in
the sides ofbearing cap to seâl agâinst leakage in thejoints
between cap and crankcase. The n€opr€ne composition
swells in the presence ofoil and heât. The seâls âre undeisize
when newly installed and may even leak for a short time
until the seals hâve had time to swell and seâl the opening.
See Fig. 647'28.
The neoprene seals are slightly longer than the gtooves
in the bearing câp. The seâls must noi be cut to length.
Before installation ofseâls, soak for 1 to 2 minutes in light
NEOPRENÈ COMPOSIT'ON SEAL
A P P L Y S E A L E R
TO THESE
TWO AREAS
486430
F i g . 6 4 7 - 2 9 - S e z L e r A p p l i e d r o S p l i t L i n e
F i g . 6 A 7 - 3 0 . ' P a c k i n g S e â l l n l ô B l o c k
oil or kerosene. After ;nstâllation of bearine cap in
crânkcase, install seal in bearing cap.
To help eliminâte oil leakage ât thejoint where the cap
meets th€ cmnkcase, apply silastic sealer to the rear main
b€a{ng cap split line. Wh€n applying sealer, use only a thin
coâr as an over âbundance will not allow the câp to s€ât
properly. See Fig. 6À7-29.
After seal is installed, force seals up into the câp with
a blunt instrument to be sure of â s€al aa the upper parting
line between the cap and case.
Rsar Main Bearing Uppgr Oil Soêl Repair
L Remove oil pân.
2. lnsen packing tool (J21526-2) against one end ofthe
seal in ihe cylinder block. D.ive the old seal gently into the
groove until it is pâcked light. This varies from 1/4"
(6.5mm) to 3,/4' (19mm) depending on the amount of pack
required. See Fig. 6À7'3i.
3. Repeat Step 2 on the other end of the seal in the
cylinder block.
4. Meâsùre the âmount the seal wâs driven up on one
side ând add 1/16" (l.6mm). Using a single edge râzor
blade, cut that lenglh froû the old seal removed from the
reff ma;n bearing cap. Repeât the preocedure for the other
side. Use the rېr main bearing cap as a holding ltxture
when cutting the seal.
5. lnsiall Guide Tool (J21526-l) onto cylinder block
See Fig. 6A7-31.
6. Using packing tool, work theshort pieces cut in Step
4 into the guide tool and then pack into cylinder block. Th€
guide tool and pâcking tool have been machined ao provide
a built-in stop. Use this prccedure for both sides. see Figs
6A7 -31 ^îd 6A1-32.
NOTICE: It mây help to use oil on the sho pieces
ofthe rope seâl when packing into lhe cylindef block.
7. Remo\e lhe guide rool.