Tighten the exhaust manifold bol ts/nuts to 50 Nm. DO NOT OVERTIGHTEN.
50 Nm
Note! On the s ix---cylinder engines the exhaust manifolds must always be fastened with new, thinner stud bolts and
self---locking nuts (in the tractor production: F12761---). In the tractor production and in the spare parts the material
of the exhaust manifolds (six---cylinder engines) has been changed into new type (6900, 8000---8200: H01722---.
8400, 8050---8750: H01169---).
54
Model Code Page
21. Engine
1. 6. 1999
6000--8750
212 4
1. 8. 1998
I. Fitting cylinder head
1. Measure the length of the cylinder head bolts. Compare
with dimensions shown in figure below. Change too long
bolts.
max. 142
max. 188,5
2. Screw the cylinder head stud bolts in to the cylinder block
to a torque of 30 Nm. Fit the valve tappets if removed.
3. Check that the sealing surfaces are clean and fit thecylinder
head gasket(s) and the cylinder head(s). Ensure that on the
six cylinder engines both cylinder heads are parallel by
fastening lighty the exhaust manifold before tightening the
cylinder head bolts (the exhaust manifold can damage, if the
heads are not parallel). Clean and lubricate and fit the bolts.
Note! The cylinder head gasket order numbers are 8366
46351 (320/620/634) and 8367 46354 (420).
420
1
2
3
4
5
6
7
8
910
11
12
13
14 15
16
17
320, 620, 634
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
4. Pictures above show the correct tightening order of the cyl-
inder head bolts. The order has also been marked on the cyl-
inder heads.
5. Tighten the cylinder head bolts progressively as follows:
1. First tightening to 80 Nm
2. Tightening of 90˚
3. Tightening of 90˚
4. Adjust valve clearances
5. W arm engine up to normal operating temperature with
light loading (approx. +75˚C)
6. Tightening of 60˚.Adjustvalves.
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