Cylinder Head, Assembly; New Cylinder Head; Check Valve Stem Position In Relation To Camshaft - Volvo D 20 Service Manual

Group 21 Engine
Cylinder head, assembly
G. Cylinder head, assembly
New cylinder head
a New cylinder head must be the same type as the
old. Cylinder heads designed for use with lvl 12
bolts must not be used with M '11 bolts.
Cylinder heads can be identified as follows (see
illustration at left):
Number series followed by B = M 11
- Numbe. series followed by C = M 12
LJSA,/Canada
1982- has a different type of cylin,
der head and swirl chamber. Swirl chamber and
its bore is 2 mm (0.080 in) smaller in diameter
Newcylinderhead
Opetationcl
cl
Install oil ieis and pin studs in cylinder head
Carelully tap in oil jets using a brass punch.
Note! Turn outerjets to point across cylinder head, see
fis
lmportantl Check specification ;nd type of cylinder
h e a d . M ' 1 2 b o l t s m u s t n o t b e u s e d w i r h M 1 1 b o l t s .
Differenttype cylinder heads are used for LJSI,/Canada.
G2
Checkvalve stem posilion in relationto camshaft
This measurement is carried out to ensure thatthere is
sufficient adjustment lattitude for valves.
Place gauge 5222 with largest diam€ter ring, on cylin-
der he8d. (Small ring is for B 17-B 23 engines.)
Notel F.ont bearing recess diameter'is larger than
others. Make sure that gauge is positio.ed correctly.
Taking each va,ve in tu.n, check that stem does not
conlact gauge. lf this happens, grind valve stem.
Vslve length, mm {in}
New Min
I n t a k e v a 1 v e . . . . . . . . . . . . . . . . . . . ' 1 0 4 . 8 ( 4 . 1 2 6 ) 1 0 4 . 3 ( 4 . 1 0 6 )
E x h a u s t v a l v e . . . . . . . . . . . . . . . . ' 1 0 4 . 6
( 4 . 1 1 8 i 1 0 4 . 1 ( 4 . 0 9 8 1
4 l