PART 7: STARTING & OPERATING THE VEHICLE ENGINE WARMUP
(05/10) Y53-6032 – 95 –
Engine Warmup
The purpose of engine warmup is to allow oil film to be
established between pistons and liners, shafts and bear-
ings while your engine gradually reaches operating tem-
perature.
Warmup Procedure
1. After you’ve started your engine, idle it at approxi-
mately 600 RPM while you check
• oil pressure
• air pressure
• alternator output
WARNING! Do not start or let the engine run
in an enclosed, unventilated area. Exhaust
fumes from the engine contain carbon monox-
ide, a colorless and odorless gas. Carbon
monoxide can be fatal or can cause serious
respiratory illness if inhaled.
2. After a few minutes of idling at 600 RPM, increase
your idle speed to 900 or 1000 RPM. Continue your
warmup. This procedure allows oil to warm and flow
freely while pistons, liners, shafts, and bearings
expand slowly and evenly. In extremely cold tempera-
tures, you may have to increase idle speed.
NOTE: In colder climates where the temperature
is often below freezing, the warmup for turbo-
charged engines is especially important. Chilled
external oil lines leading to the turbocharger will
slow the oil flow until the oil warms, reducing oil
available for the bearings. Watch the engine oil
temperature or pressure gauge for a warming
trend before increasing engine idle speed (RPM).
3. Continue the engine warmup until the coolant temper-
ature reaches at least 130° F (54° C). At this temper-
ature, you can use partial throttle. Wait until the
coolant temperature is at least 160° F (71° C) before
operating at full throttle.
Y53-6032.book Page 95 Monday, May 24, 2010 3:37 PM
To Next Page
Loading...
