1993 CHEVROLET CORVETTE Owners Manual

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I vice &..Appearance Care
z 'A
Throttle Cable Adjusters
Your 1993 Corvette is equipped with
special throttle cable :adjusters.
If you
need-
to adjust the throttle. on your
engine; please see a qualified Chevrolet
,dealer or. refer to the 1993 Corvette-
Service Manual.
256
Automatic Transmission Fluid
When to Check and Change:
A good time to check your automatic
transmission fluid level is when the
engine oil is changed. Refer to the
Mairitenance Schedule-to determine.
when,to change.your fluid. See the
Index under Scheduled Maintenance
Seruices .
How to Check:
Because this operation can be a little
d-#icuft, you. may choose to have :this
dorie at .a Chevrolet dealership Sejrvice
If you do it yourself, be sure. to follow all
the instructions here, or. you could get a
false zeading on the dipstick.
Dt?p,ElI-tment..

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Wait at least 38 minutes .before
checking the transmission fluid level if
you have
been driving:.
When outside temperatures ae above
At high speed for qui-tte a while.
In heavy traffic-especially in hot
To get -the right reading, the fluid
should be at normal op-erating
temperature, which
is 180°F to 200°F
(82OC to 93'C).
90°F (32OC).
we-ather.
To Check T-ransmission Fluid Hot:
Get4he vehicle warmed.:up by driving
abaut 15 miles. (24 h) when outside
temperatures are ab.ove 50°F ( 10OC). If
it's colder than 5OoF (lOC), drive the
vehicle in D (third-gear) until the
engine temperature gage.moves and.
then-remains steady for ten minutes.
Thenfollow the procedures under To
Check the Eluid Hot or Cold.

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Automatic Transmission Fluid
(C.ONT.)
To Check Trafisinission Fluid Cold:.
A cold check is made after the-vehicle
has been sitting for eight hours-or miore
with. the engine offand is used only as :a
feference. Let the,engine run at idle for
five minutes if &utside temper&n%:_s are
50QF (10%) or-mare. If it's colder than
5QoF [lUaC), you may have-to idle the
engine longgr; A hat check must follou7
wheaffuid. is added dw"lqg a cold.check.
To Check the Fluid Hot or Cold
Park your vehicle- on: a- level place.
Place the ;shift lever in P (Park) with
With your foot on the brake pedal,
the .parkingbrake applied.
mave the shift lever through each gear
range, pausing for about three
seconds in each range. Then, p-asition
the-s-hift'lever in P (Park).
minutes ,or more;
Let the engine rd .at idle for three
Then, Without Shutting Off the
Engine, Follow- These Steps:
1. Pull out the dipstick and wipe it with
a
clean rag or paper towel.
2. Push it back in all the. way, wait three
seconds and then pull; h back out
again.
3. Check b.& stdes af the dipstick, and
read the
loweg. limd. The hid he1
must be in the COLD area for a cold
checkor in th-e HOT or er0s.s-
hatched area for a hat checl<.
4. If the fluid level is whe$e it should. be,
push the dipstick b:ack in all the way.

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c How to Add Fluid:
Refer to the Maintenance Schedule to
determine
what kind oftransmission
fluiil to use. See the Index under Fluids.
G Lubricants.
If the fluid level is low, add only enough
of the proper fluid to bring. the level up
to the COLD area.for a cold-check or
the-HQT
area for a-.hot ‘check. It
doesn’t take much fluid, generally legs
than a pint. Don’t overfill. We
recommend
you use only fluid IabeIed
DEXRON@-JIE, because fluids with that
label are made especially
for your
automatic transmission.. Damage caused
by fluid other than DEXXO-Nq-IIE is not
covtir,ed by your-new vehicle warranty.
After adding fluid, recheck the fluid
level as described under How to Check.
When the correct fluid level is obtained,
push
the dipstick back in all the way.
Manual Transmission Fluid
When to Check
A good time to have it checked is when
the
engine oil is changed. Howevw, tbe
fluid in your-manual transmission
doesn’t require-changing.
How to Check:
Becguse this operation can be a iittie
difficult,
you may choose to-have this
done at a Chevrolet dealership Service
Department.
If you do it y.Ourself, be sure to follow
all the instrvctiuns here, or you could
get a false reading.

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Manual Transmisskm fluid
(CONT.)
Check the fluid level only when your
engine is
off, the vehicle is parked on a
level place and the transmission is cool
enough for you to rest your fingers on
the transmission case.
Then, Follow These Steps:
1. Remove the filler plug.
2. Check that the lubricant level is up to
the bottom .df the filler plug hale.
3. If the fluid level is good, install the
plug and be sure it is fully seated. If I
the fluid level is low, add more fluid
as described in the next step.
260
How to Add Fluid:
When you need to add fluid, put in
enough to, bring the level up to -the
bottom of the filler plug hole in the
transmission case. Refer to the
Maintenance Schedule to determine
what
kind of fluid. to use. See the Index
under Fluids G Lubricants.
I
.. .. ,.*Ti
Hydraulic C/ufch
(MANUAL TRANSMISSION)
The clutch linkage in your vehicle is
self-adjusting.
When to Check and What to Use:
Refer to the Maintenance Scheduleb bo
determine how often you should check
the fluid level in your clutch master
cylinder reservoir
and what to add. See
the Index under Owner Checks G.
Sewices and Fluids ,& Lubricants.
HOW to Check and Add Fluid
The clutch master cylinder is under
the Engine Control Module (ECM) in
the left rear area of the engine
compartment.
To check the fluid, look at the area
between the
ECM and the battery.

Downloaded from www.Manualslib.com manuals search engine To add fluid, the ECM unit rnust.be
moved.
Loosen the two nuts-on the ECM unit.
With the
LT1 engine, there is one nut
on the outboard side
o€ the ECM unit
-and
one nut on the inboard side. With
the
LT5 engine, both nuts are on the
inboard side
of the ECM unit.
Move the unit to either side. Do not
disconnect
any wires.
Fluid should be added if the fluid level
iS at
or below the ADD mark on the
reservoir. There are additional.
instructions on the
reservoir cap.
When returning the
ECM to its proper
pasition, make
sure the bolts are
aligned with the: slotsin
the bracket.
Then gently push
down on the unit.
When.replacing
the unit, be careful not
to overtighten the nuts.
Rear Axle
When to Check Lubricant:
Refm to the Maintenance Schedule to
determine how often to check the
lubricant. See the
Index under Periodic
Maintenance Inspections.
How to Check Lubricant:
If the-levelis below the bottom 0.f the
filler
plug hole, you'll need to add some
lubricant, Add enough lubricant to raise
the level to the bottom of the filler plug-
hole.
26 I

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262
Rear Axle (CONT~)
What to Use:
To add lubricant when the level
use Me Lubricant (GM Part Na
12345977) or SAE BOW-90 GL-5
lubricant. To completely refill after
-draining, add four ounces (118 mQ af
Limited-Slip Dlfferential Lubricant
Additive (GM Part No. 1052358). Zmn
fill to the bottom of the filler plug hole
with Axle ‘Lubricant (GM Part No.
12345977) o,r SAE 8OW-90 GL-5 gear
lubricant.
Engine Coolant
e foUowing explains your cooling
sgstm and how to add coolant when it
is Im. If you have a problem with
e~@e overheating, see the Index under
Engine Ouerheating.
The proper coolant for your Corvette
* Give freezing protection down to
Give boiling protection up. to 262°F
Protect against rust and corrosion.
Help keep the proper engine
Let the warning lights work as they
-3m (-37°C).
(128°C) ~
temperature.
should.
What to Use:
Use a mixture of one-half clean wafer
(preferably distilled) and one-half
antifreeze that
meets “GM Specification
1825-M,” which won’t damage
aluminum parts. You can also use a
recycled coolant conforming to GM
Specification 1825-M with a complete
coolant
flush and refill. If you have the
LTl engine, use GM Engine Coolant
Supplement (sealer)
with any complete
coolant change.
If you use these, you
don’t need to add anything else.

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Adding Coolant-LTI Engine
Tb Check Coolant:
Wh& your engine is cold, :che.ck the
dipstick on the cap of the coolant-
recovery .tank. The. coolant level should
be at C.OLD, orst little higher. When
your engine-is wm, the level on the
dips’tiik should be up to HOT, or a
little higher. If your engine is
overheating, see the Index under
Engine Overheating.
Your Corvette als:o- has .a coolant high
fill res.Crvoir lgcated at the-right re,ar of
the engine compartment.