Page 21
200-6 Technical Description
The oil flows from the inlet strainer in the sump
through the oil pump and relief valve and via the
oil filter to the main gallery in the cylinder block.
Oilways run from the gallery to the main bearings
and a rising oilway runs to the cylinder head for
lubrication of the camshafts and valve
mechanism. A pipe for lubrication of the turbo
unit is also connected to the main oil gallery.
The hydraulic cam followers operate in an oil
bath, with oil supplied via oilways incorporated
in the securing bolts for the camshaft bearing
caps. Deaeration of the oil is effected as it flows
through the camshaft bearing.
Oil filter
The oil filter is of the full-flow type: i.e. all of the
oil circulated to the lubrication points flows
through the filter.
Saab 900
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ted
ing
WS
Technical Description 200-7
Engine mountings
General
The engine mountings are designed to absorb
the movement of the engine while it is running
and also to limit the transmittance of engine vib-
ration and noise to the body.
The damping action of the engine mounting rub-
bers is progressive - the greater the load on the
mounting rubbers the greater the resistance.
Thus, the engine mountings protect the sur-
rounding components from excessive movement
of the engine.
Engine mounting rubbers
The engine mounting rubbers have two primary
modes of operation: under normal driving condi-
tions, only the No. 1 sections of the mountings
are operative, providing low damping resistance.
However, when the car is accelerating or braking
hard, sections 2 and 3 also come into play, pro-
viding a considerably greater damping effect.
Checking the engine mountings
The engine mountings can be inspected in situ.
Check:
* to see if the rubber bonding has come away
from the mounting body.
Saab 900
Page 23
a lll
200-8 Technical Description
® that there is clearance between the rubber
and the mounting body at both top and bot-
tom.
Hydraulic engine mountings
Hydraulic engine mounting rubbers have the fol-
lowing advantages over conventional ones:
¢ |mproved damping of horizontal movement of
the engine during acceleration.
e Improved damping of vertical movement of
the engine when the car is travelling over
bumpy ground.
e Improved damping of vibration when the en-
gine is idling.
¢ Improved sound-insulation properties bet-
ween the engine and body.
As from chassis No. F1033151, hydraulic engine
mountings are fitted at the two rear mounting
points in Turbo 16 models (with manual gear-
box).
As from M86, cars with manual gearboxes have
hydraulic engine mountings fitted al! round.
As from M86, cars with automatic transmission
have hydraulic engine mountings at the two rear
mounting points.
Saab 900
Page 24
Technical Description 200-9
The hydraulic engine mounting has two cham-
bers containing a special damping fluid. Linking
the two chambers is a port, and the length and
cross-sectional area of this port govern the
damping properties of the mounting. The cham-
bers are also separated by a diaphragm which
takes up the forces generated by the small move-
ments of the engine occurring under normal con-
ditions.
The capacity of the diaphragm is not sufficient to
damp large engine movements; under these
conditions, fluid is forced from the upper to the
lower chamber, equalizing the pressures. The
damping action of the hydraulic mounting is
therefore progressive, with the resistance to
movement increasing with load.
1 Upper chamber
2 Lower chamber
3 Port
4 Diaphragm
Page 25
Removal and refitting, B202
The following procedure for removal and refitting
applies to the M88 B202 Turbo engine equipped
with intercooler, catalytic converter, AC system,
water-cooled turbocharger and manual gearbox.
Various departures from the method described
will have to be made on account of differences in
different model years and engine variants.
To remove
1 Disconnect the linkages for the bonnet
hinges, disconnect the washer hose and re-
move the bonnet.
Stand the bonnet where it will not be dam-
aged, e.g. leaning securely against a wall.
2 Insert tool 8393209 between the upper
wishbone and body on the RH side: turn the
wheel to full RH lock and insert the tool from
the wheel-arch side.
3 Disconnect both battery leads.
Remove the battery.
4 Unbolt the exhaust pipe from the exhaust
manifold.
5 Slacken the wheel bolts on the RH wheel.
Page 26
6 Drain the power-steering fluid reservoir.
7 Raise the car.
8 From underneath the car:
a Remove the nut and carefully tap the
taper pin out of the selector rod.
Separate the selector rod from the link- i
age. Me
b Disconnect the speedometer drive.
c Remove the exhaust pipe bracket bolts
from the gearbox.
d Undo the clips on the gaiters over the in-
board drive-shaft joints and pull the gait-
ers off the driver cups.
Page 27
9 Lower the car to a convenient working
height.
10 Remove the RH front road wheel.
11 Separate the lower wishbone and anti-roll
bar from the ball joint.
12 Separate the inboard drive-shaft joint on the
RHside and move the inboard end of the
drive shaft forward of the driver cup. Support
the shaft on the end of the wishbone.
13 Disconnect the discharge pipe from the
steering servo pump and cap the open end.
Don't get any fluid on the engine mounting
rubber.
14 Slacken the tensioner and remove the drive
belt for the AC compressor.
15 Drain the coolant through the drain plugs on
the block and at the bottom of the radiator.
Disconnect the oil filler pipe.
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16 Disconnect the coolant hoses from the fol-
lowing:
a Heat exchanger valve
N.B. Label the hoses to ensure they are
reconnected properly.
b Expansion tank
c Thermostat housing
Page 30
17 Disconnect the LH fuel injection system wir-
ing loom at:
a Air mass meter
b Throttie-position sensor
c Injection valves
d Temperature sensor
e Earthing points on engine lifting lug
f AIC valve
If necessary, use a small! screwdriver to release
the catches on the connectors.
18 Disconnect the remaining leads in the loom
from:
g AC compressor thermostatic switch
h Thermostatic switch for AC fan
i AC temperature sensor
j Unplug the connector for the shift-up indi-
cator vacuum switch
19 Pull clear all the disconnected leads, lift the
loom out of the engine bay and rest it on the
AC heat exchanger.
20 Remove the turbo discharge pipe.
21 Remove the air mass meter complete with
rubber socket connector.
22 Remove the air cleaner complete with air in-
take.