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Engine
C:05:01
Cylinder Heads
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RETIGHTENING-TIGHTENING
Before commencing the above operation, loosen
the inlet manifold fixing bolts. Also the bolts
securing the timing cover to the cylinder heads.
RETIGHTENING CYLINDER HEAD
This operation is to be carried out when the
engine is cold (at least 2 hours after engine has
stopped).
Cylinder heads should be retightened:
1.
After a cylinder head has been replaced. Run
engine until engine reaches normal operating
temperature, i.e. when cooling fans have
•
switched themselves on.
After two hours, when engine
is
cold,
repeat
tightening procedure.
2.
After a service exchange engine has been
fitted.
While engine is in its transit cradle (and
easily accessible).
The vehicle need not return to workshop for
cylinder head retightening when the above
procedure
is
observed.
PRETIGHTENING-Fig.
22
Loosen bolt No.
1
and retorque tighten to 15 lb ft
(20
Nm).
Repeat the above on each bolt
in
the
tightening sequence shown.
0
7
8
0
l
0
7
8
0
0
3
4
0
0
3
4
0
0
2
1
0
0
2
1
0
0
6
5
0
0
6
5
o
Fig. 22
ANGULAR
TIGHTENING-Fig.
23
Slip graduated disc
J.28857
over the socket
before fitting the torque wrench
J.28855.
Turn the
graduated disc clockwise until the locking stem
rests against a solid object which will prevent the
disc from turning.
Fig. 23
J.28857
Adjust the moving pointer to angular tightening
value
115°.
Tighten bolt No. 1 until the moving
pointer reaches "0". Repeat the above operation
on each bolt in sequence shown. (Fig 24)
Fig. 24
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