Sunbeam ALPINE I SERIES: APLINE II SERIES, Workshop Manual, Page: 60 / 413

2nd re-issue
Page 22
SEALING RING
Fl1. 21.
Valve sprint
cup shawinf sea/inf
rint
rroove
To refit
The valve stems should be given a thin coating of oil
when the valves are refitted.
The valve spring cups have a sealing ring In the lower
end. See Fig. 21. When refitting care should be
taken to avoid damage to the sealing ring as damaged
rings can cause oiling up of the sparking plugs.
The sealing rings should be renewed If faulty.
EXAMINATION OF VALVES, SPRINGS
AND GUIDES, ETC.
Valves. Examine for pits on the face, burning and
distortion or cracks In the heads. Burnt or cracked
valves must always be scrapped. See also "VALVES
-REFACING".
Examine the seatings In the cylinder head, and If
defective they should be treated as subsequently
described. lf the valve stems are appreciably worn
the valves must be scrapped.
Wear of valve stems may be checked by means of
a micrometer, and the stem should be checked from
various angles and positions, as the stems of valves
do not wear evenly. The stem diameter of new
valves Is given In the Data Section.
On the 1592 c.c. engine both valve stems have
a ·001' (·025 mm.) taper along the ground length of
the valve stem. The smaller diameter Is at the valve
head end which Is ·001' (·025 mm.) less In diameter
than the valve cap end diameter.
Guides. These may be checked for wear by using
a new valve as a gauge. The valve stem should be a
free sliding fit In the guide without excessive side
play.
In making the foregoing tests both valve stem and
valve guide must b� free from carbon or burrs and
free from oil.
WSM.124
Section B (Engine)
Springs. If possible the load required to compress
the valve springs to their fitted heights should be
checked. The required load and length to compress
the springs Is given In the Data Section under
"Valves". The use of a dial type valve spring tester
Is strongly recommended.
If a spring test Is not available a simple rig as
Illustrated In Fig. 22 can be made and used. An
alternative method Is to check the used valve
.,-
.
..,
I
I
I
I
I
I
I
I
I
I
I
I I
I I
·-----r---_,
To use.-Compress spring until
'U' shaped distance piece is grip­
ped. Release spring until distance
piece is just free to move. Take
spring balance reading. A = fitted
length.
Fl1. 22.
Valve
spring
testing rig
springs by comparing them with new springs. See
Fig. 23. Place them end to end on a long bolt and
compress them In a hand press. Any loss will then
be apparent as the weaker spring will close up
first. If either spring of a pair Is weak both Inner and
outer should be replaced as a pair even though
the outer spring In the original pair may appear to
be satisfactory when compared with a new spring as