CHI

33 - Wednesday, March 29, 1989 - North Shore News

Turbochargers and oil do not mix

TURBOCHARGERS AND motor
oils are not the best of friends.

In fact, if given the opportunity,
they can destroy one another.

Interestingly, most of the dam-
age to both engine and oil occurs
not while the turbos are jetting at
120,000 rpms but, rather, after the
engines are turned off.

When the turbos are operating,
the motor oil is constantly cir-
culating around the engine,
lubricating the metal bearings and
keeping the engine cool.

Typically, the oil flows at a rate
of 4.0 litres per minute through the
turbocharger unit.

The turbine shaft, driven by ex-

haust with a temperature of over
600°F, rotates at 120,600 rpms, or
2,000 revolutions, every second.
_ At the same time, water coolant
is circulated around the turbo
bearings, also cooling the oil as it
returns to the oil sump.

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1 4 Wheel Brake

alt

This ‘‘cooling’’ maintains the
temperature of the oi! in the oil
sump between 200 and 250°F.

Upon engine shutdown, howev-
er, the oil feed pressure and flow
to the engine rapidly returns to
zero, leaving a thin film of oil on

the hot surfaces of the tur-
bocharger bearings.

This film of unreplenished oil is
exposed to temperatures which can
exceed 600°F.

Not only can these extremely hot
temperatures cause motor oils to

break down, but they can cause
*‘coking’’ or burning of the motor
oil on the bearings.

Coked motor oil becomes tar-
like and can block critical oil
Passages, eventually destroying the
lubrication-starved turbocharger,

Coked motor oil also can coat
the turbo bearings, hindering their
ability to let the turbo rotors turn
freely, which also can lead to tur-
bocharger failure.

See Coking
Page 34

SPRING REPORT

Eeaer

Customer Satisfaction is
NUMBER ONE PRIORITY.

Our customers are our
most important asset.
That's why when they
bring in their cars or
trucks for service they
receive our undivided at-
tention from start to
finish. We've have in-
vested in the most up-to-
date, state of the art
equipment and extensive
training programs for our
Service Technicians. We
carry a comprehensive
parts inventory, and a full
line of Auto Par and
Mopar auto accessories
for do it yourselfers. For
these reasons our
customers continue to
bring their car & trucks
back to Jubitee for ser-
vice time & time again.
Our committment for
1989 is 100% customer
satisfaction. Bring in your
automobile and = ex-
perience what first class
service is really like.

The Autopar 4S i! All Season Radial offers the
convenience of an all season and the durability

FILTER
CHANGE

¢ Install up to 5 litres of
Autopar Engine Oil and an
Autopar Oil Filter © Inspect
C-V joint boots (where
applicable).

$96°° oF hs ed

of steel belts at an economical pnce.

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© Install new Autopar spark plugs

¢ Check plug wires. distributor
cap. rotor, coil, PCV vaive, belts,
hoses, compression, ai filter and
battery © Adjust timing and idle -
(N/A fuel injected vehicies).

$5995 $@995

acyl 6 CYL

$7 495 $G9*>

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SPECIAL PRICED IN EFFECT UNTH.
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FOR MOST NORTH AMERICAN BUILT CARS:
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SPECIAL

One of the most
critical functions on
today’s new auto-
mobiles is often
overlooked during
maintenance. For
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call us today and
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$7 B95

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APREL C1, 1909

FOR MOST NORTH AMERICAN CARS &
UGHT TRUCKS

Regular maintenance adds life to your car.

“An ounce of prevention is worth a
pound of cure.” This age old axiom.
as anyone who has experienced an
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heeding when it comes to protecting
yeur second most important invest-

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of your car. See us today we'll be glad
to set up a maintenance schedule
that will reflect the needs of your car.