MAIN MOVING SYSTEM EM -41
HLA ( HYDRAULIC LASH ADJUSTER)
With the HLA filled with engine oil, hold A and press B by
hand. If B moves, replace the HLA.
For oth
er specific trouleshooting regarding HLA, refer to
the tab
le below.
B
A
EDDA
020B
Prob
lem
Poss
ible cause
Acti
on
Temporary noise on starting a
cold engine.
Normal This noise will disappear after
the oil in the engine has reached
normal pressure.
Continuous noise when engine is
running after sitting more than 48 hours.
Oil leakage of the high pressure
chamber on HLA, allowing
air to get in.
Continuous noise when engine is first
started after rebuilding cylinder head.
Insufficient oil in cylinder
head oil gallery.
Co
ntinuous noise when engine is
ru
nning after excessive cranking.
Noise will disappear within 15 minutes
when engine runs at 2000~3000 rpm
If it doesn’t disappear, refer to
item 7 below
Continuous noise when engine is
running after changing HLA.
Oi
l drain out of the high-pressure
ch
amber in HLA, allowing
ai
r to get in.
In
sufficient oil in HLA.
CAUTION
Do not run engine at a speed
higher than 3000 rpm as this
may damage HLA.
Engine oil level too high or too low. Check oil level.
Drain or add oil as necessary.
Excessive amount of air in the
oil at high engine speed.
Check oil supply system
Continuous noise during idle after
high speed running.
D
eteriorated oil
C
heck oil quality.
Low oil pressure
Check oil pressure and oil supply
system of each part of engine
Noise continuous for more than
15 minutes.
Faulty HLA. Remove the cylinder head cover and
press down on the HLA by hand.
If it move, replace HLA.
CAUTION
Be careful of hot HLA.
NOTE
HLA noise could occur to your engine due to malfunc-
tion of HLA if you use additives besides engine oil reg-
ulated to HMC.
ZENITH POWER PRODUCTS - 416
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