Group 21
Reconditioning engine
Specifications
TIGHTENING TORQUES
The tightening torques shown below apply to oiled nuts and
bolts.
Degreased (washed) parts must be oiled prior to assembly.
Tighten all bolts in stages according to below:
1 = 10
Nm
(1
kpm =
7 ft. lbs)
2 = 30
Nm
(3 kpm
=
22 ft. lbs)
3 = 60 Nm
(6
kpm - 44 ft. lbs)
4 = Wait
10-15
minutes
5 = Slacken bolts
6 =
15-20
Nm
(1.5-2.0
kpm =
11-15
ft. lbs)
7 = Angle-tighten to
113-117°
8 = Warm-up engine to operating temperature
9 = Cool block 30 minutes
10 = Slacken
and
then retighten
bolts one at a
time
in
specified
tightening order.
Retighten according to stages 6 and 7.
Tightening sequence for cylinder head bolts
#
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!
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Tightening sequence for main bearings (via lower crankcase)
Main bearings
Tighten all nuts in stages:
1 = 30 Nm (22 ft. lbs)
= Slacken nut 1
= Tighten nut 1 to
30-35
Nm (22-26 ft. lbs.)
= Angle-tighten nut 1 73°-77°
=
Slacken and retighten the other nuts in the order
specified in stages 2-4.
Nm
Cylinder head (see below)
Connecting rod bearings 45-50
Crankshaft front end,
1975-1977 160-180
1978-
240-280
ft.
lbs.
33-37
118-133
177-207
40 mm = 1.575 in
45 mm
=
1.772 in
1975-1977
1978-
Nm
Camshaft sprocket 70-90
Flywheel (always use new bolts) 45-50
Spark plugs (do not oil)
12±2
Valve cover
15
ft.
lbs.
52-66
33-37
9±1.5
11
10
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