The Oskaloosa herald. (Oskaloosa, Mahaska County, Iowa) 1885-1919, 1915-07-22


felt while orankina the machine. When
l have run 400 or 500 miIss. tho knock
reappsars. The machine has run $500
niIes In all. Can you tell the trouble7
The most probable cause Of the
knock you mention Is a loose bearing.
This may be a main, connecting rod,
wristpln or camshaft bearing. 1t
might also be caused by q broken pis-
ton ring, the camshaft being out of
alignment, or IL the knock IL not very
severe it may be the result Of carbon
on a valve seat. As 1t is most probable
that Is it in the erankshaft bearings,
these should be inspected and IL nee
essary carefully taken up, or If they
are badly scored they may need to be
scraped, or In an extreme case they
will require replacing. In taking up
the bearings great care should be ex-
ercised not to get them too tight and
1t should be noted that it is quite pos
sible that the reason your machine be-
gins to knock again after going 400 or
800 miles after the bearings have been
adjusted too tightly. When bearing
Is too tight excessive friction is the re-
suit, and overheating occurs. This
wears the bearing away In a very short
time and in some cases may even melt
the metal. The bearing should be only
taken up enough to remove all play.
1t would hardly seem possible that
the bearings should need scraping
after the car has gone such a short dis
lance, but II they have been adjusted
too tightly it may be that they are bad
~ scored, and II this is the case scrap
Ing will be necessary. This operation
should be left to the care of an ex-
perienced and skillful mechanic and is
not a job for the novice.
Kindly tell me the best way to true
up the wheels on a car. feel that my
wheels are not running true. ....
Before anything is done be certain
times all that is necessary is to re-
adjust the tie rod, which connects
both wheel knuckles. Wabbling front
wheels may be caused by bent axle,
bent spindle. partially broken bearing,
interior of hub worn, etc. The com
mon cause is bent spindles. and good
repair man can bend these back In
shape.
Why 10 it hard for me to start my car
when ! run out Of gasoline and refill
the tank again?
Possibly the carburetOr float sticks
against the side of the chamber, SO
that it is difficult for the gasoline to
flow in. Another explanation is that
there is dirt in the fuel pipe and that
therefore the passage OF fuel Is very
slow, with the result that 1t takes
some time for the chamber to become
filled, and if an attempt is made to
start before this time difficulty may
be experienced.
Can you tell me how to mend a crack
in the crank case2 It is so bad that
the oil leaks out in a short time.
You cannot mend this yourself I'M
less it is very small, in which case
you might be able to patch 1t with a
piece VI oACCl SlCCl AuSittl ohu oSAAAS
rivets. If the crack is. of any size it
is best to have it welded, although II
the place Is so situated that it is not
strained by the operation of the motor
1t may be sufficient to solder 1t.
What effect does the practice of u.s.
ina tho motor as brake coming down
a hill have on the mechanism of an au-
tomobile2 ...... .....
The use of motor as a brake is
generally conceded to have more OF
less deleterious effect on the gears
The power through the gears is re-
versed, since the car is now tending
to drive the motor. Thus instead OF
1 having the stepdown reduction we
have a step-up with consequently
more surface pressure on the teeth
and hence more abrasion.
Where is the best place to look for q
knoek7
All moving joints are susceptible tc
knocks, Tracing through the trans
mission of power from the cylinder tc
the rear axle, we find that at each
point Of engagement of one or more
moving parts with other parts there Il
q chance for a knock. Starting with
the piston, If this Is too loose, there
will be distinct Shaping sound. Il
can only be cured by the use Of al
diversified piston. The next point is a.
| the wrist pin, which might have
! knock due y looseness In the uppel
connecting rod. The fourth point is II
the main bearings III the 'crankshaft
flfth at the connection between thu
crankshaft and clutch, then in the uni
yersal joints and the gear box bear
ings and between the teeth Of the DIFF
ferent gears Loose valve tappets
timing gears, ETC., are also fruitful
sources OF knocks.
viii IL shorten the life Of q piston b,
drilling to tighten Il, or 10 there an,
DISADVANTAGES in 90 doina7 +.
You can driIl. the pistons and Sc
good results. Many racing cars us
such pistons. 1t will be better AM
cheaper IA the end to get pistons Q
some light material, such as mag
! nallpm sss