Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1921-05-22
.GUERRL|CH LECTURES ON
COMPRESSION LEAKAGE
Declares One of Most General
Points Of Escape Is Through
the Spark Plug.
VALVE CAPS CAUSE TROUBLE
Bad Leak in Piston Ring VIII Cen
orally Indicate Itself by Kissing
Sound in the Engine " hon
Climbing Hill.
Lecture No .I5.
Compression Leakage.
Dy Frederick 4. Gut

bE Frederick 4. Gucrrlich VI y.
Let us now see how the first of
The Three Essentials. namely. loss Of
compression. can 70 wrong.
The illustration shows mo various
places through which tho compressed
gas might escape. The spark pluc
may leak a; y. the nut which holds
the porcelain into tho metal. part.
TINS leakage generally hcinc accom-
panied by n kissing sound Tho
remedy for this is to tighten tho nut.
and this failing to remedy tho trouble
II would probably bc wise to replace
the plug
Therc may be leakage between the
plug and the cylinder o. valve can a,
Tie place where the ping is screwed
in. as 3. The remedy is TO screw mo
Rug in farther or it may bc nccos.
sary to put "a new raskct Ghat Il, ,
packing washer under IT, Leakage
here may be discovered hv pourirr
little oil around tho plug. n Tho
oil bubbles there is leakage. ANA .bo
amount or leakage can hc indeed by
me degree OF Dubblng When r.pl,c-
ing spark Plug it is a good practice
10 make paste Of some rolSc
graphite and linsecd oil Cor If Won
nave no linsced oil. cylinder oln ,,I
10 smear this on the threads of mo
psus. This Will not only hcI, 10
make the plug tight. but will nrcvor,
the plug and tho metal oc tho cv,i,, ,,r
from tus!ng together. due to tho hon.
cut again. ''heh
{ The compression cocks NAV also
M s.T, rms may be at the threads. nv
i'm INC spark plug; nj the valve: or
me stem naT he broken. espccinll,- If
IL be one OF the long stem ,ypc ;,b,.
TEST Tor leakage is the oil rs riy",,
.or the plug | might say that Tho
ofinn , Oh me compression cocks do
"Ltei preak ana cause n great leak;
feet to the eye wv" f''
Leakage may. ana very often docs.
occur at the valve caps. g. OIL noi,-aI
around them viii also indicate Will
ct there is leakage ut this plnco
Nnen the valve caps are rcplnraI
AFTER grinding the valves new ...s
hels should always he used smear
ing paste made OF brown ShcIlac and
make graphite on the threads will do
y great deal TO make them tigh,
10 not recommend the using of TN,
Sheiiac and graphite on the shark
nues. as the shollac is liable To make
the unscrewinG o! the plugs difficult
ana should the plugs hold tighter I'm
the valve caps than the valve cans
hoid IN the cylinder. YOU viii not bc
aple 70 take out q plug without talk
ing the cap out also. so that In, ro.
placing OF defective plug may provr
Il difficult task -
Tho next place TO look for leakage
IS AT II, tho valve There are a mum
her of things which mirht 10 ~
cause OF leakage here, namely. tho
valves pay have become burned or
rs II is termed. pittcd. and SO noon
reSrindirg the ralvc head may have
warped: the valve stem nIay have
,.a' IN MS GUIDE the valve epring
may nave broken or the adjusting
nuts. Il. may hc too high so tina, Tho
waive is not seating properly Your
Judgment Will tell YOU whether or
not inc valves need TO be rcground
as this should be done about every
200 miles and the face tina, ;hov
need the roCrindirc will bc indjcainI
70 YOU by tho gradual loss ~ power
Thc fact that the valve head has
warped tunGsual in the la,cr mCdnl
cars). can only hc determined by TAX
ing the valves out. You Will he :.bIe
10 sec the broken spring, or sticking
IaiVcs ana you can tel! II the adjust
ing nuts arc too high by feeling OF
'nem' ThcH should have clcaranc.
81 ahout The thickness OF q piece Of
paper, and, by raising tho M; Win
your fingers, YOU should hc able to
feel this clearance.
- "4u pay IN INC -. wing az CaSo-
iine 10 have your XAiv. :ptound in"
quite often. as loss OF powc-. which
VIII result from loss OF COMPRESSION.
means that you are not getting All
OF the power out Of your fuel
The next place where leakage is
liable 10 occur y AT L. the PISTON
rings. This may BE- due 10 a broken
ring, worn rings, the rings sticking
because OF carbon or rummcd oil got
ting between hem and their grooves.
"a scored-that is scratched cylinder
due to the engine becoming overhead
Cd Tor lack OF oil or water or to tho
SLOTS OF the rings getting I'm limo.
when the pistons are nut into tho
cylinders, care must be taken 10 have
The slots ~ the rings spncoG equal
distances apart Where The rings arc
broken or worn, they must bo re-
placed. II IS good practice 10 pour
about half cuDfUl Of Kerosene into
each cylinder about once q week. and
1t is best to do this while tn" en-
CINE is warm after completing = ram.
This VIII ;ent "a prevent tho rings
from siicE ing in their grooves. -
Inc cylinders have been scored YOU
viii have TO have them reborcG and
new rings and piStons fitted
= bad Leak at th- piston ring viii
generally indicate itself hv a hiysil,.
sound in the engine when climbing a
Mill.
You can toll whe,h,r or no. your
tnEine hae los; compress ION rs crank-
ms II SLOWLY and noticing low much
you must null ou 'ho crank handle