G.
Keniove iiuts Iiolcling carburetor to maiiifold
aiid reinove carbiiretc>r.
i.
Kernove bolt and nuts holding exliaust pipe
to
riiaiiifold.
S.
Reniove rnnnifold stud niits and nianifolds.
O.
Remove tlie upper radiator Iiose. Remove al1
spark plugs by usiiig tlie socket xvrench fur-
riislied
in
tlie tool kit. Ilciiiove the cylincler
Iiead cap screws, stud niits
ancl the tempera-
ture gaiige bulh, tlieii lift Iiead from eiigine
block.
Kemoval is niacle easy by iisiiig lift-
ing
Iiociks screwed in No.
1
arid 4 spark plug
holes. CAUTION-Do iiot use screw driver
r>r any otlier sharp instriinient to drive in
between tlie cylincler hcad aiid tlie blnck to
break tlie Iiead
loose froiii tlie gasket.
10.
Kemove tlie valve cover plate screws aiicl the
valve cover. Care sliould be taken when
re-
moviiig the valve cover breather tube not to
lose tlie copper gasket on eacli screw as
~vell
as
tlie screen and
gasket. With
a
piece of clotli
or cotton waste cover the three holes iii tlie
\ralve charnbers to prevent tlie valve keys
dropping into crankcase upon renioval.
11.
I<emovc valve tappet clearance springs by
plating
screw driver oii top edge and snappirig
out. \Vith valve spring conipressor insertecl
between valve tappet and spring retainer raise
spriiigs on tliose valves which are in closed
position and remove valve locks. Turn crank-
sliaft witli crank or by fnn belt until tliose
v;ilves wliicli are opcii become closed antl re-
peat tlic operation.
12.
Keiiiove valves and place tlieni in a valve
carryiiig board.
so tliat they can be identified
as to cylinders from
wliicli tliey were removecl.
Remove valve springs. Tlie valve springs
sliould be tested
lor pressure which slioitld
sliow I16 Ibs. mlieii valves are open (Lengtli
IK') or
50
Ibs. pressure ivhen closed (Lengtli
27&"):
Tlie [ree length of the valve spring is
295"
inches. Any springs wliicli are distorted
or clo iiot fall mithin tliese specifications sliould
bc rcplace<l witli new springs.
13.
Clean c;irboii from cyliniler Iiead. top of
pistons.
v;ilve seats aiid cylincler block, cleaii
valve guicles with guide'brush. Clean valves
on
a
nire klieel briisli niaking sure that al1
carbon is removecl froni tlie top and bottom
rif the heads, as \\rel1 as the gum wliich might
liave accutiiiilated on the sterns. The valve
Iieadsshould tlien be refaced at an angleof
45".
If
valve scats in block sliow signs of excessive
pitting it is advisable to reface tlie seats and
clieck
witli dinl galige-Fig.
4.
Tlieii by hand.
toucli up tlie \~;ilaes to tlie valve seats with
Iiiie valve grinding cornpoiind.
Tlie clenrancc betwcen tlie intake valve stem
and the valve giiide is
.0015"
to
.00321if',
the ex-
haust valve stem cleararicc to giiide is
.002"
to
.00:375".
Excessive rle;irance betweeii tlie valve
stem and the valve giiide
wil1 cause improperly
seating aiid biiriied vnlves. If tliere
is
too niucli
clearance
between the inlet valve stem and tlie
valve gitide. on tlie suctioii stroke tliere wil1 be a
teiidency to clraw uil vapors up tlie giiicle into the
comhustion chaniber
causing excessive oil con-
suml~tion, fouled spark plugs and poor low
speed
performance.
To clieck the clearance of the valve stem to the
valve guide, take iiew valve and place in each
valve guide
and ieel the clearance by moviag tlie
vake stem bark and forth. If tliis
tolerante
is
excessive it
uvill bc nerensxy
to
rel~lace tlie valve
giiide.
othenvise tlie vnl\.e stern is worn.
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