PS Magazine - TB 43-PS-444
PS, The Preventative Maintenance Monthly
ISSUE 444
NOVEMBER 1989
our bible fOr antiFeeze fOr liquid cooling sysTems is ±B 750-651. It spells
out proceduRes fOr cleaning and conditioning cooling systems and gives the Type
and amounT of anTiFeeze needed fOr varioUs degrees o² proTecTioN. ±h³s ±B
applies to all Army equipment.
´or good operation, a cooling sysTem should heaµ up to 160° to ¶80°´ regardless
of The cold weaTher. I² iT won'T, have the engine's ThermosTat checked·it coUld
be sTuck open and need replacing.
Cooling sysTems That consTanTly go over 200°´ also need attention. Again, iµ
could be a bad ThermosTaT, a clogged radiaTor, a bad radiatoR cap of ¸ilThy coolaN¹.
ºR maybe the flow o² air is blocked.
Air cooled systems don'T need too much attention. All THey need is a good
»ow o² aiR with all the aiR¼fLow sh½ouds in place. ±o speed up heating in zero
weaTher, you can p¾rTially cover the a¿½ intaKe grills with canvas when starting.
Just be suRe to take iT ofÀ afTer The engine Reaches operaTing TemperatUre.
Radiator Cap
Make suRe you've goT the cap The
±-²:³=´µ¶
±Á lisTs ÂR your cooling sysTem·noT
soÃe c¾p you've scrounged Äom ¹he
#
junk y¾rd oR grabbed oÅ some otheR
/
equipmenT.
The pressure Rating of the cap is No.
1
Impo±ant! ²oo low cuts the boILing
poInt of your coolant³ Too high can
buIld up pressure that'l´ pop the seams
In your radIator and b´ow hoses.
±0
NOV 89
r[J DUf RWF±<!²
Hoses
Æoses also need a close look. ±hey h¾ve To handle heaTÇ pRessure and vibration.
Èoses
roT, harden or cRack as they age.
HARD
(crackS aRe a clue)
-
l
Problems to Fix or Repo·
Éook over your radiaTor ÊR leaks·top ¹ank, Font ¾nd back of coRe, boTtom
tank. Ëeaks may not show up wet when youR engine's cold. Ëook Êr Rus¹ or
oddÌcolored dribbles where coolant has leaKed and then dRied up. ±hen lateR,
when you've got your engine running at opeRating TemperaTuRe and pressuRe,
cHecK these places again fOr weT leakage. Íse a »ashlighT Îor boTh hoT and cold
iNspections.
NOV 89
±²
Coo´ant µn
engIne oil .³¶
shows on
dipstick as
blobs of
wateR
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