Volvo D20 - Tightening Torques

Specifications
TIGHTENING TORQUES
Tightening torques apply to oiled nuts and bolts.
Degreased (washed) parts must be oiled prior to
assembly.
l)
r
~
m
-
m
v
~
o
Il!>
o
El O
D20
e o
o El
D24
o O
0
El
TIGHTENING OF CYLINDER HEAD BOLTS
M 11
1:13531
o 4D
l)
1]) ,
Use new washers, convex side upwards. Tighten in
five stages:
1. 50 Nm ( 37 ft Ibs)
2. 70 Nm (50 ft Ibs)
3. 90 Nm ( 65 ft Ibs)
4. run engine until oil temperature is at least 50 ·C
(122 ~ F)
5. 90 Nm (65 ft Ibs)
Retightening
- Atter 600-1,200 miles (1,000-2,000 km). Engine
should be eold
or almost eold . Tighten each bolt
separately in specified order, see above fig.:
l. Slacken bolt 30~
2. Torque to 90 Nm (65 f t Ibs)
1371Y
10
TIGHTENING SEQUENCE FOR CYLINDER HEAD
BOLTS
Importanti slacken bolts in reverse order when
removing cylinder head.
Removeoil and
dirt from bolt holes. cilleft in holes will
reduce pressure
on cylinder head gasket.
Bolt threads and washers must however be oiled,
otherwise frietional forees will be too large.
Two types
of bolts are in use: An earl y type with M 11
threads and a later type with M 12threads. (Later type
is threaded along entire length.)
M12
~&ill , : ,.I\\i
,\11 \\' ;~\(
-
: l iii
- ~
Use new bolts. Not necessary to replace washers.
Tighten in six stages:
1. 40 Nm (30 ft Ibs)
2. 60 Nm (44 ft Ibs)
3. 75 Nm (55 ft Ibs)
4. angle-tighten 180~ in one movement without stop-
ping
5. run engine
until oil temperature is at least 50 ~ C
(122 ~ F)
6. angle- tighten 90~ in one movement without stop-
ping
Retightening
After 600-1,200 miles (1,000-2,000 km). Engine
should be cold or almost cold.
Tighten each bolt separately in specified order, see
above fig.:
1. Angle-tighten bol t 90° in one movement without
stopping.
Do not slacken bolt first.