Cylinder Head - Mitsubishi S4E Manual

AiTb .... ther
The breatJler for
letting
fresh air into nnd
letting
out
fumy air from the crankcase is loc,ated On thoe fight-hand
side of the
engine . It
prevents the pre ssure inside the
crankcase from building up and thus minimizes the
amount of lube. oil gcltLn& into the combusti on cham-
bers.
Cylinder head
' ~ :D
®~il
®
t
Air breather
,
/ .,
l ..R. oc ker covar
2.cyllnoer tu:mo bolt
3-CyllnQer head
4-Gasket
S·Pnrcon1bu",1ion ch9mbef jEll
6.v~1
...
e
USl
Cylinder hil:l'ad
CONSTRUCTION AND FUNCTION
Cylinder head
The cylinder head is , 'ingle·piece , .. ti.ng, elaborately
jacketed for improved cooling and also
ror
greater
S{rtlClura]
rigidity.
Exhaust pOTts, intake ports and pre-
combustion chambers, each numbering
fOUl,
arc cast out
inside the: head. The exhaust ports open out to the
right,
and the intake ports to the left.
A total of 17 bolts secure the cylinder head to "'.
cylinder block. The positions of these bolls. are sequen-
tially referred to in the tightening procedure , and are
numbered sequen tially , starting wIth "1 " and ending
with "17" as shown .
Fcwvtrd
~
Tl9ht~ning
sequence
Precgmbustion chambers
The precombustion chambe r Is formed with
(I
cast-out
space and an orifice piece - pre combustion chamher jet
- fitted into the
cylinder head from its. g-asketed side.
The shapes of the piston crown iln[j the commun icating
orifice are snch as to produce good turbulence c ... -en
when the engine is ruTUling slowly . The glow p1U8,
sticking oul into the ante chamber -
pr~combustjon
chamber - right beside the
inJeclion
nozzle is a st ar-ting
aid in cold weather.
Cylinder head gllSket
The gasket for sealing the joint between cylinde r head
and cyhnder block is es:sentially an asbestos insulator
sandwiched between two thin steel shee ts, with its
-combustion chamber holes. being edged in apron fashion
by
stainless :;ted grommets.
The:
bottom
surface
in
contact
with.
the cylinder block is cO:3ted
with
II
special
sea ling compound for improved sealing effect.
Rocker cover
The rocker cover is aluminum alloy
in
material.
V shotS, .... alve seah; and springs
The lntake
valv~
has Its disc s.ized :is large as possible for
increased
suction tfficiency .
The material of valves is heat·resislant steel having good
hot-hardness. This steel used
in
exhaust valves is of
;I
special kind havillg extra high resistance to high ·temper-
atUre' creeping,
burning and oxidation ,
fatig.ue an
thenna.] shock .
Elich valve guide is fitted with a stem seal to prevent
lube oil from entering the combustion chamber.
17