Saab 95 1967, Руководство по обслуживанию

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32 ,
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S 1233
mARKING OF PISTONS AND CONNECTING RODS
19, The two upper piston rings can now be removed
from the piston with piston-ring pliers. The center
spring and segment in the tripartite oil control
ring can be removed by hand.
PISTON WITH
CONNECTING ROD
NOTE _
As from about engine No. 274 900, the connecting
rods have been provided with strengthened big-lend
bearing caps and longer screWS. In this connection,
the following madifications have been made:
A. The crankshaft counter-weights have been mo-
dified to compensate for the increase in the
wei ht of the connecting rods.
9 dified to allow
he connecting "Od
B. The oil pump has been slightIY mo
greater clearance between t
and the oil pump.
Old and new type connecting ro w con-
mixed in the same engine- However. the ne
_ dad
necting rods may be fitted in old engines. pros;
that all connecting rods are changed- The Ste:
resulting unbalance and 9'“ can be tome
ds must not be
Reassembly
I.
If n
ecessary, clean the Piston ring grooves (using a
2:“ of a worn piston ring). Lubricate pistons,
. SS and cylinder bores with engine oil. Place the
p'St°"_"I"9$ in the following manner:
Lhe 011 control ring center spring gap 180° from
wiihnllk on the top of the piston; the oil segments
side of thgaps staggered in. (25 mm) on either
sic . e center spring gap; the lower compres-
'_" “"9 gap 150° from one side of the center
:IPr'W gap and the upper compression ring gap 150°
Om the other srde of the center spring gap. In-
stallation of the piston rings as above is essential
for optimum sealing and low oil consumption.
Segment ring Compression ring
in. (25 mm)
The mark faces
forward
Oil control ring,
center spring
in. (25 mm)
Compression ring
Segment ring
S 2921
LOCATION OF PISTON RING GAP
2. Fit new connecting rod bolts.
NOTE
Fit new connecting rod bolts every time the crank-
shaft has been disassembled.
3.
Lubricate the piston and cylinder with a thin coat
of engine oil.
4. Install the piston together with the connecting rod
using tool 78 62 287 by carefully pressing the pis-
ton with the handle of a hammer. Make sure that
the mark on the top of the piston faces forwards.
Concerning piston- and piston ring clearance, see
section 210.
“AB 216-5