Ford T Series User Manual

THE FO · RO :\1ANUAL
-- ----
What about the J\ r 2.~ .7
care of the Valves? Answer 1 v 0 . .)
They seldom~ out or' order-but thcty do get dirty, as a result of
carbon _colle ctmg on ~e valve seats. These carbon depo sits, by
prev~nting proper closmg_ of the valves, permit the gases under com·
press1on to escape, resultmg in loss of !'>ower and uneven running of
the m~tor. ~·when turning ~e engine over slowly, there is a lack
of-tesisUn_ce ~ one or more cy l mders, it is probable that the valves
need re-grmding. As the "life'.' of the engine depends largely upon
the p~oper seating of the valves, it is 11ecessary that they be ground
OCCaSIOnally.
How are Va l ves removed A · J\ T
2
~A
for s;rinding? - nswer 1 v 0 . 'T
(I) Drain radiator; (~) re~ove cylinder head ; (3) remove the two
v~ve .~vers on the nght Side of e ngine; (4) raise tlie valve spring
With hftmg tool (see Cut No. 5) and pull out the little pin under. the
valve seat. . T _he valve may then be lifted out by the head - prepar -
atory to grmdmg.
How are Valv es A
ground? nswer No. · 25
For this work use a good grinding paste of ground glass and oil_:_
procurable from auto supply houses. A convenient way is to put a
small amount in a suitable dish, adding a spoonful or two of kerosene
and a few drops of lu brica ting oil to make a thin paste.
Place the mixture sparingly on the bevel face of the valve. P ut the
valve in position on the .
, ... .
valve seat, and rotate it ·
back and forth (a'bout a
quarter tum) a few times,
with a Ford grin ding tool.
- Th en lift slightly from the
seat, change _ the position
and continue the rotation,
and keep on repeating th is
operation until tlie bearing
c:-. surface is · SxnOOth and
bright. The valve should
not be turned through a
complete rotation, as this is
apt to cause scratches run-
ning around the entire cir-
cumference of the valve and
seat. When the grinding is
complet ed the valve shoul d .
be removed from the cylin-
l\lethod of grinding valve. (
Cut ~ o . 6) der, thorough ly washed
with kerosene, and the valv.e
seat wiped out thoroughly.
Extre~ e care should be taken that no abrasive substance gets into
the cylmde rs or valve guides. This can be avoided if the grinding
'P.aste is applied sparingly to the bevel face of the valve. ·
THE FORD · E NC it\E
IS
If the vaive seat is worn badly or seamed, it is best to have it reseated
with a valve seating tool. This operJltion requires considerable
skill, and perhaps had better be don~ bM11Ul ,expert me chani c. Care
should be exerci~;ed against making too de~p a cut, necessitating the
retiming of the valve .
When the Valves and Push
Rods are worn - what?
.
When the valves or push rods become - worn, so as to leave too much
play . between them, thus reducing the lift of the valves and dimin ·
ishing
the power of the m' otor, it is · be&t to replace the push rods with
new ones. Th e clearance between the push rod · and the valve stem
should never be greater than n" nor le ss than -h". If the clearance
is greater, the valve yvill open l11.te and close early, resulting i..n ~en
running of the motor. If the clearance is less than -h_" there is
danger of the valve remaining partially open all the time . . ]if replac-
ing the push rod does no t give the proper clearance, the 1)';11\.e should
also be replaced. _we do !'lot ~eco~mend drawing 04!;. - ~hll< x.al ve
stem, as the operation requu es expenence and the price of the new
part does not warrant the time < and expe~a.: necessary to properly
do the work.
Wllat about the
Vqlve Springs?
Answer No .· 27
When the valves fail to seat themselves properly, there is a poss . i- f
bili ty that the springs may be weak or broken. A weak inlet spring/
wo~!ld probably not affect the running of the engine, but weakn es~ .
in the exhaust valve spring ca us es a very uneven action, which i\;
difficult. to lo cate . T he symptoms are a l ag in the engine due ~o
the exhaust valve not closing instantaneously, and ' as a result a cer·
tain percentage of the charge under compression escapes, greatly
diminishing the force of the explosion. Weakness in a , valve sp/ing
can usually be detected by the following method: Remo~e the J
plate whi ch encloses them at the side of the cylinder and in rt a
screw
driv er between the coils of the spring while the engine i run·
ning. If the extra tension thus produced causes the engi ne pick
up speed, the spring is obviously weak and should be replac~ with
a new one. ·
W/Jat causes "Knocking"
in the Eng~'ne?
An swer
There are several causes, which may be enumerated as
carbon knock - which is by far the -most common-re
carbonizing of cylinders; (2) knock caused by a too adv
(3) connecting rod knock; (4) crank shaft main beari
knock due to loose -fitting piston or broken ring; (6)
the piston striking the cylinder hea& gasket. W n the engine
knocks from any cause whatsoever, the matter sho d l?e promitly
investigated by an experienced mechanic and th difficulty cor-
.
rected. ·

Ford T Series Specifications

General

Brand	Ford
Model	T Series
Category	Trucks
Language	English