Page 61
214-18 Valve gear, B201 and B202
Sealing the valve cover
Oil leakage from the valve cover may occur at the
three split plugs and the distributor entry. To pre-
vent leakage, silicone sealant should be applied
at these points.
ae Fe ee < +e
————— ————
=r
lal If leaks have occurred or whenever the valve
cover is removed, apply Bostik Silicone 2680
sealant to the cylinder head flange.
cP a Pwer}
Remove all traces of old sealant and then apply
a bead of the new sealant, approx. 4.5mm
(0.2 in) thick to the cylinder head flange.
wus
Apply sealant at these points
Saab 900
Page 62
a Valve gear, B201 and B202 214-19
To dismantle the valve gear
(cylinder head removed from car)
1 Remove the distributor. aD ; G
%
2 Remove the oil pipes and the camshaft bear-
ing caps and lift out the camshafts.
N.B.
Do not twist the pipes when removing them as
this is liable to damage the contact surfaces be-
tween the pipes and fittings.
3 Remove the cam followers and place them in
stand 8393787 to ensure they will not be |
confused when refitted. |
4 Remove the valves. Place the valves in stand
8393787 to ensure they will not be con-
fused when refitted.
Saab 900
Page 63
214-20 Valve gear, B201 and B202
N.B.
The cylindrical tappet guides around the valve
springs constitute the sealing surfaces for the
cam followers. These surfaces must not be
scratched or scored, so use a plastic sleeve to
protect the guides. Use the special valve spring
compressor, 8393761, and special anvil
83 93 779. Withdraw the plastic sleeve by insert-
ing the special angled tool under the reinforced
edge.
S 2264
Page 64
A
TE
©
.
Valve gear, B201 and B202 214-21
Assembling the valve gear
1 Fit the valves and springs. Use plastic
sleeves to protect the tappet guides.
N.B.
Prior to assembly, thoroughly lubricate all the
parts. Replace any defective valve stem seals
before fitting the valves.
2 Check the valve adjustment, following the
procedure described in this section.
3 Fit the cam followers.
N.B.
Stand the cylinder head on wooden blocks to
avoid bending the valves as the camshafts are
tightened down.
4 Fit the camshafts and bearing caps.
Bearing cap markings:
1-5 = Inlet-valve camshaft
6-10 = Exhaust-valve camshaft.
Tighten the bearing caps to the specified
torque.
Tightening torque: 15 Nm (11 Ibf ft)
S$ 2/248
SP 2a?
Saab 900
Page 65
214-22 Valve gear, B201 and B202
5 Refit the distributor and the lubricating oil
pipes. Check the condition of the 'O' rings in
the fittings.
N.B.
Make sure when refitting the pipes that the out-
let holes face the right way. The longer pipes lo-
cate in the straight couplings and the shorter
ones in the elbows.
After reassembling the pipes, reconnect the
pipework to the oilways in the bearing caps
and cylinder head,
N.B.
Do not twist the pipes as this is liable to damage
the mating surfaces between the pipes and the
fittings.
6 Line up the marks on the camshafts with the
respective timing marks.
Saab 900
Page 66
Valve gear, B201 and B202 214-23
Valve stem oil seals
To change (in situ)
Follow the same procedure as that detailed for
the replacement of valve springs, valve heads or
collets.
1 Rotate the crankshaft, line up the 0° mark
with the timing mark (top dead centre for no.
1 and no. 4 cylinders) and remove the cam-
shafts (all valves are closed in this position).
Place a cover over the timing cover aperture
to prevent collets or seals falling inside.
.
2 Using magnetic tool 8391 401, lift out the
cam followers.
N.B.
Set aside the parts carefully to avoid confusing
them on refitting.
&
3 Fit plastic sleeves (special tool 83 93 746)
to the valve springs to prevent the tappet-
guide bores from scoring or scratching. Note
the way in which the sleeves are oriented.
| Saab 900
Page 67
214-24 Valve gear, B201 and B202
4 Unscrew the spark plug for the cylinder con-
At cerned and fit compressed-air adaptor
I 8392326. Connect the adaptor to an air
line and raise the pressure on the piston and
valves.
5 Position tool 8394181 on the valve head,
2 HH direct in line with the valve stem. Using a
hammer, tap the tool firmly once, where-
upon the collets should come free from the
valve and follow the tool out.
Pe ater
6 Lift out the spring cap and valve spring.
Saab 900
Page 68
Valve gear, B201 and B202 214-25
7 Remove the valve seal using tool 83 94 157.
To refit
1 Remove the shank from tool 8393 803 and
fit the valve seal in the tool with the taper
facing inwards (away from the valve head).
2 Fit the seal on the valve stem. Use a plastic-
faced mallet to tap the seal carefully into
position.
Saab 900
Page 69
214-26 Valve gear, B201 and B202
3 Fit the spring and spring cap.
4 Position the collets in the groove in the
spring cap as shown.
5 Using tool 83 94181 with sleeve 83 94 207
and a hammer, carefully tap the collets
home.
6 Remove the plastic sleeves and fit the cam
followers.
Saab 900
Page 70
a Valve gear, B201 and B202 214-27
Overhaul of valves, valve guides and
valve seats and replacement of valve
stem seals (cylinder head removed)
Remove the valves, see "To dismantle the valve
gear’.
Valve stem seals
To remove
Remove the seals from the valve guides using
tool 83 94 157. If the guides are to be replaced,
remove the guides and seals together.
a
To refit
Refit the seals using special tool 8393803.
Place the seal in the tool and then allow the tool
to be guided by the valve guide. If the valve is fit-
ted, use the stem as a guide. Tap the seal into
position using a plastic-headed mallet.
2 A TT
s
5
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Saab 900