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10
Chapter
I-General
Engine Repair
TobIe
3-5pr;ng Test
Sp ecification
s
Enginfl
Y
ea
r
Test
J
.ength
Compression
(
Pounds
)
--
R
1949-1950
2.1
3
37-40
R
1951
1.89
40-42
HandM
1949-1951
2.11
47-50
-
E
1949-1951
1.6R
63-69
(4)
REFACING VALVES. Remove
all
carbon
from
the
valve
head
and
stem.
Grind the face
of the valve
at
45
0
angle as shown
in fig. 10.
If
the
valve
head is
less than
' 1
32
inch thick at the outer edge replace the
valve.
(5)
REFACING
VALVE
SEATS.
Clean
seats
thoroughly with a wire brush to prevent carbon from
becoming
embedded
in
the grinding wheel during
the
refacing operation.
Keep
grinding dust from
entering
the
engine. R
emove only enough stock to clean
up
pits
and other
depressions.
NOTE:
Worn valve guides
nlust
be replaced be/ore
re/acing val've seats.
After
regrinding the valve seats,
the
width of the
seat must
not
exceed V16
inch
measured across the face
of
the
seat as shown
in fig. 11.
Tf
the valve seat
is
too wide, remove just enough stock
from the
top
or
bottom
of the va lve seat to reduce the
width
to
approximately
%6
inch.
This
can be
done
by
using
a 30
degree
angle
grinder
to remove stock from
the
bottom
of
the
valve
seat,
a
nd
a 60 degree
angle
grinder to
remove
stock
from
the top of the valve seat.
The
valve seat should
not
exceed
0.005
inch run
out.
Check the
valve
seat run
out
with
a dia
l
indicator (fig.
12). Lap the
seat a nd
valve together
with
a
fine
lap-
ping compound
to finish
the
operation.
Fig
.
8-Burnishing Val
v
e Guide
valve 1pring
-
65 I
3- _ _
~
1037
Fig
. 9-Checkin
g
Valve
Spring
b.
Valve
Seat
Inserts.
Some
R
series engines are
equippe
d with valve seat
inserts
for
both intake
and
exhaust
valves,
others
use
inserts in the exhaust val ve ports only, and some
have
no
inserts at all.
The
H
,
M,
and
E
se
ries engines
have
inserts
in the exhaust valve port only.
Valve
seat
inserts
are pressed into
the
counter
bore
in
the
cylinder
block
valve port
(fig.
13).
(1)
REMOVAL. Remove
the
insert
by
driving
a
we dge
under the insert and
prying
it out.
(2)
INSTALLATIUN.
Chill the inserts with
dry
ice
be
fore
inserting them in the cylinder block.
Tap them
with
a
soft faced
hamme
r
until they seat firmly in the
recess.
After
installing
the
valve seat
inserts,
grind them
concentric
to
the valve guides.
Fig
.
10-Grinding Valve Face
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