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1-.- Thermostat; 2 - Therm, ,stat housing; 3 - "0" ring, seal; 4-,. , -: TheTmostat
gasket; 5 - - Valve collet
,halyes,
6-~"--
Valve spring seat; 7-Rocker
arm~~aft
,bracket
sub--assenlbly;8--Valve sprin:; lower seat;9-Cylinder head cover sub-assem-
•
' ;
,
"i
bly ; 1 0 - Lifting bracket; 1 1 -
Cylinder head rear cover; 1 2 - Cylinder
head
front
,and rearcovar gasket; 13--Cylin.der head; 14-Valve guide ;'15--'SwirlcoIrtbustion
chamber insert; IS-Intake valve seat insert;17-Exhaustvalveseatinse,rt;:la---ln-
jector clamp; 1 9 - Intake manifold gasket; 20-- Cylinder head, cov.er
gasket;~.l~_-
-,
Outer valve spring; 2 2 - Inner valve spring; 2 3 - Intake valve; 2 4 -
Roc~er
arm
,
,
"
: ' ,
" i
shaft bracket stud; 2 5 - Exhaust valve; 26--- Cylinder head front cover;
27-"-
T'em-
perature gauge
a~apter;
28--'Exhaust manifold gasket;
'Cylinder head is an one piece casting <Fig.; 2 ).Theind"ep'en-
dent intake and exhaust manifolds are installed on 'each side
,of·-the
cylinder head respectively. A thermostat is installed," o-Ii,the' cylin-
der head front cover to regulate the outlet wa'ter ternperatur·e".The
insert, with a slant throat of
kidn~y
shape cross ---: s"ection and a
small cOIlical hole inside, is pressed into the' bottom of the swifl
chamber. The small conical hole should be aligned ;with the' nozzle
center line in installation of the insert
so
,as to mak:e the' 'engine
easy to start. The valve guides and seats, made by powder,'tnetal-
lurgy and of alloy cast iron respectively to increase theirwe'a.r·;-·re-
sistance, are all pressed into the cylinder head with interference
fit.
Intake and exhaust valves are made of alloy steel and heatre-
sisted alloysteel respectively. The head of the
intak~
valv,e
is bigger
than that of the exhaust valve. There is a strict'dimellsional re-
..
quiremeIlt for the distance from the valve head to the cylinder head
bottom surface in order to keep the engine compresslontatio ex-
actly and to avoid the valve
impact against the piston. The valve is
fitted with inner and outer valve springs and positioned by the up-
per spring seat and the collet halves.
The rocker arm mechanism.is housed in the cylinder head cov-
23
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