SERVICE MANUAL
Retorque cylinder head retaining cap
screws to 95-102 N
·
m {70-75 ft.-lbs.) and
readjust valve clearance to "Hot" setting
after engine has been started and
reaches operating clearance. Refer to
following paragraph for valve clearance
adjustment procedure.
27. VALVE CLEARANCE AD
JUSTMENT. The recommended valve
clearance with engine cold is 0.33 mm
(0.013 inch) for intake valves and 0.38
mm (0.015 inch) for exhaust valves.
Recommended clearance with engine hot
{normal operating temperature) is 0.28
mm {0.011 inch) for intake valves and
0.33 mm {0.013 inch) for exhaust valves.
Valve clearance can be adjusted as
follows:
Remove timing plug from left side of
cylinder block and turn crankshaft un
til top dead center timing mark
me
Fig. 31) is aligned with timing notch in
housing
as
shown. Check rocke1·
arms
for
No. 1 and No. 4 cylinders. If rocker arms
on No. 4 cylinder are tight, No. 1 cylinder
is on compression stroke
and
valves
in·
dicated in Fig. 32 can
be
adjusted. If
rocker arms on No. 1 cylinder are tight,
No. 4 cylinder is on compression stroke
and valves indicated in Fig. 33 can
be
ad
justed. After adjusting the four valves in
dicated in appropriate Fig. 32 or 33,
rotate crankshaft one complete turn and
adjust clearance of the remaining four
valves.
VALVES AND SEATS
All Gasoline Models
28. Intake valves seat directly in
cylinder head and valve stems
are
equip
ped with
neoprene
oil seals. Positive type
valve stem seal kit is available; however,
valve guides must
be
machined to accept
seal. Exhaust valves have renewable
seat inserts and
stems
are
equipped with
positive type valve rotators <Rotocapsl.
Replacement exhaust valve seat in
serts are provided in 0.25 mm (0.010
inch) oversize only. When renewing
the
seal
inserts,
remachine
cylinder
head
so insert
counterbore
measures
31.991-32.017 mm (1.2595-1.2605
inch
es) to provide recommended 0.08-0.13
Fig. 31-AIIgn the
"DC"
flywheel
marie with notch
as shown when adjusllng valve clearance as
described In paragraph 27.
Fig. 3o-Exploded view of
cylinder head. Rocker arms
should
be
IISsembled with
offset as shown In Fig. 36.
I
Cyhnd•r he
a
d
2 Intake
,-aln
3 \'ah·e
gutde
• Pu•h rod
6
Exhau&t
vaiH
6
Exhaust
,-eht
.cat
7 Valve
8Jlnng
8. E>.hauaL
''81ve roLntnr cap
9.
Intake
volvo
"""I &
cop
10 E�h•u•t
''slve
ke\'�1"1
I I Intake
volvt
ket�r
12 F.xhauot '·ah·.- cap
13 lntah vah·�
cap
Paragra
p
hs
27-29
mm (0.003-0.005 inch) mterference
lit
Intake valve face and seat angle is 30°.
Exhaust valves have a face angle of 44
and seat angle of 45 to provide the
recommended 1
,
mterference
angle.
Desired seat width is 1.6-2.4 mm
(1116-3/32 inch) for all valves. Seats can
be narrowed
using
15'
and 75
°
stones.
VALVE GUIDES
All Gasoline Models
29. The presized intake and exhaust
valve guides are interchangeable. Inside
diameter of new gllldes is 8.019-8.057
mm <0.3157 -0.3172 mchl. Inner
bore
of
new guides has a fine, spiral groove or
rifling which gives guide an unfinished
appearance upon inspection, but guide
must not be reamed.
'Ib
renew the
guides, press old guides downward out of
cylinder head using a piloted mandrel
Press
new guide in from the top until
distance (A-Fig 34
l
measured from
rocker arm cover gasket surface to top
of gu1de is
2.38 tnm 13/32 inch).
Valve stem diameters and clearance
limits in guides are as follows:
Valve Stem Diameter-
Intake . . . . . . . . . . . 7.978-7.998 mm
<0.3141-0.3149 1n.)
Exhaust . . . . . . . . . . 7 935-7.955 mm
(Q
3124-0.3132 tn.)
Clearance-
Intake .
.
.
. . . . . . .
0.021-0.079 mm
(0.0008-0.0031 in.)
Exhaust . . . . . . . . . . 0.064-0.122 mm
C0.0025-0.0048 in.)
FRONT
E
I
I
£
Fig. 32-With
"DC''
timing mark aligned
es
•flown
in Fig. 31 end No. 1 piston on compression stroke,
adjust the Indicated valves Tum crankshaft one
complete revolullon untll tlmlng marks ere again
aligned as shown In Fig. 31, refer to Fig. 33 end
adjust remainder of valves.
£
I
I
f
Fig. 33-Wilh
"DC"
liming mark aligned
es
shown
In Fig. 31 and No.
4
piston on compression sllolle,
adjust the Indicated valves.
19
