The sun. [volume] (New York [N.Y.]) 1916-1920, 1918-12-01
SILENCE IN CARS
IS ALWAYS GOLDEN
Some Attention From Time to
limo Will Keep Motors
Quiet.

would like to have. among them that new
motor car on which perhaps we had set
opr mind. And, after all. we shall not
he so badly off IL we take due precau
,ious TO keep our cars In first class order
ali the time. As time goes on we are
hound to have moro or less trouble with
rolses developing both In engine and
chassis. These can be eliminated or at
sny rate minimized, but some sugges-
ions along these lines certainly will not
be out OF order.
Naturally the greater number Of the
noises that may develop In the motor
car have their location In the engine. be-
cause that has by Ear the biggest num-
her Of parts OF all the engine noises
valve clicks and slaps are by far the
most frequent in occurrence. Fortu-
nstsly valve noises are easily distin-
gushed because of the regularity of
their recurrence. The trouble may be
caused by too much clearance between
the tappet and stem or to the same con-
dltion between litter and stem in the
overhead valve mechanism. The cure Is
obvious, but the owner must be careful
10 make adjustments In the valve sys-
TEN while the engine Is hot, because
changes made when the metal Is cold
will not hold true when the engine
warns up. owing 10 the tendency of
metal TO expand under heat. BY maxi
ing the clearances just perceptible when
the tappet Is moved UP and down while
The engine is hot any noise will be
eliminated.
Occasionally It will bo found that In
stead OF the tappet the litter is at fault
through wear. The cure here is re-
rnoval OF the litter mechanism and re-
placement. though in some instances the
guide may be sprung little to hold
the INTER tighter. Wear OF either the
cam or follower will produce n slight
clicking and n new follower Is the proper
course to take in this case. Worn valve
stems or stem guides also produce a
noise, and the course to follow Is to re-
move the springs and test each valve
in turn. Hold the stem in the fingers
and try to move II sideways In its guide.
II there is any play perceptible a BUSH
ing should be placed in the guide or a
valve with oversize stems should be
employed. On accession 1t may be found
that valve head has warped. and this
will cause slap, and the only remedy is
new valve. The valve heads should
always be examined for warping when
the system is being adjusted or cared
FOR
The overhead valve system is apt to
be d little more noisy than the conven-
''yi'AA - pc DNNduSc Va bhd lebiStI
Der Of joints. Careful attention to
fabrication of the system and Its ad-
lustment will prevent undue noise.
Sometimes sideplay develops in the rock
er arms with an attendant slap. A
bearing in the arm may wear. 4 new
part or bushing for the old one will
cure this trouble. In case wear in the
shaft on which the arm moves develops.
an oversize bushing in the rocker arm
Il indicated. ,
While the valve system is the most
consistent offender. other parts of the
ohgine develop noisy operation. The
bearings may wear so that a knock
develops, growing louder as the wear In
oreases, until finally il sounds like the
bow Of u hammer on a block of wood
The cure for this condition is of course
tic taking NJ OF the bearings by removal
o. the SHIN between tho two halves or
the shaving off of the metal on the
movable half The operation OF taking
W bearings must be carefully per-
Formed or the trouble will be worse
Instead II better. The new car owner
Will DO well 20 watch the operation of
taking W bearings before he tries to
perform IL himself
When the piston or the cylinder tt
SELF is worn much out OF round
KNOCK will result that sounds not unlike
at llduN-N ~ IItlSnlluu. Inc reason
y simply that the piston instead Of
Hc!nE tightly held has room to slap
The cure is drastic. reboring Of the cyl
lnders and the installation of new
set Ut oversize pistonS and il should
el"ays be the set and not II ely a
single one
Timing gear or timing chain noises
ere not excessively loud, but they are
dN.cllt TO locate and remove without
considerable dismantling. Silent chains
a. they are used to-day have an adjust
mont Tor taking up wear and the helical
Sea" drives are usually pretty quiet,
watch could not be said for the spur
Goarl that used TO be commonly used
Tho auxiliary shafts on the engine are
not likely TO give any trouble unless
tc'r iulr.C1 ton Is neglected so that
RAPID w"rr in the bearings takes place.
Ona o. the most troublesome knocks
is 'hrt caused by prcignition. 1t is
.Ny to distinguish this metallic knock,
wi ,''r' are 50 many possible causes
t'A' II .s Mt easy 10 run down the real
ono OF 'nrce it may be due simply TO
Uc spark being too far advanced but
On Cd" ''"r hand IL may be caused by
carbon deposits, faulty timing, poor
mixture. The only course to pursue in
US case is to run down the real cause
y. u" trouble by process of elimination
shd then apply the obvious cure for that
bsS'c cause
While tho engine Is the commonest
rcAlon for noises, It has no monopoly
Oh l..s very annoying accompaniment
% motoring. The other mechanical
UNI are quite likely TO develop noisy
u.t'"- on. The clutch sometimes de-
N'iotf huclliHg, with a rafting under
u'e '.oorhoards that is intensely an
''y'"s. \ worn thrust bearing will
G'u i..a ana as the fabrication Of
ia, 90, is frequently neglected this
J.. L@"iy cough to be at the bottom
OF 'h' trouble
The g.nrset is a very likely seat
o. i".ey operation. When one of the
s.".'- 'f uIt Of alignment grinding and
e'o"uNs II the gears will cnSue Worn
MAJ rs are a likely cause OF this
'o.'.e, but the owner should have the
'S.. f'""n' corrected At once, because
We condition PRODUCES not only noise but
FgL'H gears and heavy repair bills.
IN" N~ Her shaft and universal
!''",r seldom give trouble. In spite Of
t'e STRENUOUS rart they are called upon
- i.". "A much cannot be said for
10 rear axle, which IS frequent Of
.'AI II driving pinion and the ring
?. u. 'eIeI'al master gear are not run
t!E y correct alignment there will be
'Ad hum, which. Is not only unploas-
IN 10 the oar, but prcsages trouble
l'' lNe pockctbook, When the pinion
va gear clearance Is not correct there
a'so humming accompaniment TO
N@aton. hdjustments-in this unit us