PS Magazine - JANUARY 1987
PS, The Preventative Maintenance Monthly
ISSUE 410
JANUARY 1987
MultifueL Engines .±²
Befre you mechs send a trUck To sUpport to have a heAD gaskeT leak Fxe±,
b
sUre ²he leaK's fr reaL.
Sm³
bUbbles, sEepage or a hissIng sounD may meaN the gaskeT's baD or ³e
cylI´Der heaD Is looseµ ¶hen aga·n, They m¸y notµ
HIssIng anD slIght seepage can be norMaL fr mult¹eº engI´»s, esPc·a¼ly on
the R·ght sIDe where
the½
a
heaD gaskeT
V¾ntsµ
¿hese Ve´Ts are
open at The eDge oÀ
the cYlÁnDer heaDÂ
ÃoIsT aIr may be
sÄcKeD ·n When ²he
engÁne coolsµ ¿hen
conDensaTÅon-waÆ
ter-wÇL be frceD
ouT anD can make a
h·ssÁÈg soÉnD
A
²he
engÅne heats Upµ
ÊÀ thaT's the caUse oÀ ËIssIng, It'll stop ÅN a short T·me as the engI´e heats
Upµ BUT ·À The hIssIng pUÌsates or the seepage Does´'t sTopÍ check It oUTµ
20
JAN 87
Here are some checks to see ·À yoU'Ve got leAks-oIl or cOlanT-·nsIDe or outµ ÊÀ
The engIne Is ÎÏ on These зnts, It has no heaD gaskeT leaKsµ
•
Ño hyDrostaTIc lÒk IN the engÓe when yoU're starTI´g ITµ COlanT ThaTÔs lÕakeD
InTo a cylInDer may eVen keep yoUr engI´e Öom tU×g oVerµ ÊÀ thIs check's noT
sPllØ oUt I´ the
-1´
¿Ã, see Ùage
3µ4
oÀ ÚÃ
¶1·¸´5¹
•
Ño engIne oIl ·n The coolanTµ Check the coolI´g system when ITÔs colDµ ÎIº
ÛoaTs on waTer, so ·T's eAsy To FnD when yoU sTIck yoUr Ü´ger In The raDIaTor or
sUrge
Tº
ÝoU may be ablÞ To see the oIß as a sl·me or ra·nbow color on Top
oÀ The coolanT, tOµ
•
Ño coolanT IN The engIne oIßµ àaTer
wIll show as blobs on the DIpstIckµ
•
ángIne ·s noT mIsâgµ ¿he engIÈe
shoUlD soUnD smooth when yoU get IT Up
to Its normaL oPraTIng TemperatUreµ
•
Ño loss oÀ Ðwerµ Ãake thÅs roaD
tesT whe´ The e´gI´e's Up To normal
operatI´g temPraTUreµ
±
Ño excessIVe leaks betãeen The
cylINDer heaD a´D The blockµ áxcessIVe
means oIß or coolanT Is rän´Áng Dow´
The engI´eå
æememberç e´gINe lUbe anD cOlIng systems are UnDer pressUre when Tèe eégÅ´e
Is rU´´Åêg, so DoUblecheck A´y Damp sëots or streaks when The engÅne's ìíIng
at ´ormaL oPrATI´g TemPraTUreµ
»
may ´oT show Up UnTIî The pressUre's onµ
Ja¼ 87
2½
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