PS Magazine - JANUARY 1980
PS, The Preventative Maintenance Monthly
ISSUE 326
JANUARY 1980
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The manifold air preheater used On sOme diesel and muLtiFeL engines can be
a help Or a headache. It's aLL in hOw yOu use it.
It's suppOsed tO help yOu start yOur engine in cOLd weathER: 32° ±Or beLOw.
And it helps yOu get a cOld engine running smOOthLy.
But it can ²e bad if yOu gO Over²Oard.
YOu dOn't use it tO get quicker starts when the temperature's abOve 32° ±. ³r
tO prime a hard-starting engine when sOmetHing eLse is wrOnG.
HOW PREHEATERS WORK
Th´ pµeheater system has a fue¶ pump·eitH¸r eLectricaLly Or hand
Operated¹tO pump fuºL intO the intake maNifOLd. It's aLsO gOt an eLectrical gL»w
pLug Or sPark pLug. A
¼
nd the½e's a switch tO turn On the gLOw/spark pLug.
preh¸t¹º sy»¼½m
F
.
AtOmized fuel sprayed intO tHe manifoLd is ignited by the pLug and burns tO
heat the intake air.
18
¾aw Fel in cylinDers can Cause a fLOOded cOnditiOn and make for harder
¿startingÀ ³r it can cause hydrOStÁtic LOÂk.
But hOw dOes raw fUeL get intO the cyLinders?
³ne Of à the eLectriÂal cOmpOnents cOuLd b¸ bad .Ä ÅLike a buÆnedÇOut
preheater .
.. Or an OpeÈ wire .ÉÊ Or a defective switch. This'Ll prevent fUel
ignitiOn. And it'lL let raw fUeL be puLLed
Ë
intO the cyLinders.
If Y ¾¿ F
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ą
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systemć with the hand primer pump,
give the pump Only
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Or 2 strOkes.Ĉ
ĉ tĊ mċČčĎarďĐ
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ēaĔĕ.
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