Engine Oil - Hummer H1 Service Manual

_____________________________________________________________________
¨
The turbocharged diesel engine is equipped with a Warner
Gear turbocharger. A wastegate, in the turbine housing, con-
trols boost. The wastegate is operated by an externally
mounted vacuum actuator. The actuator opens the gate to de-
crease boost, or closes it to increase boost. Waste gate position
is controlled by the PCM.
The turbocharger increases the amount of air entering the com-
bustion chambers. This allows a proportionate increase in fuel
injected into the cylinders. The result is a much denser cylinder
charge and greater power output.
The turbocharger turbine and compressor impellers are the
mechanisms that pump additional air into the combustion
chambers. The impeller wheels are operated by the high speed
gas flow through the engine exhaust system.
Engine lubrication is through a conventional mechanical pump
located at the rear of the crankcase. The pump is shaft driven
by the oil pump drive unit which in turn, is driven off the cam-
shaft. A belt driven vacuum pump is used on both engines.
Both versions of the 6.5L diesel are equipped with a high pres-
sure fuel injection system. The system consists of an electric
fuel supply pump, an injection pump, a separate injector nozzle
for each cylinder, and the necessary injector feed lines.
The rotary type injection pump pressurizes, meters, and distrib-
utes fuel to the individual injectors. System working pressure
is 1750 psi (120 bar) for turbocharged engines. The pump is
gear driven through matching gears on the pump and camshaft.
ENGINE IDENTIFICATION
The diesel engine I.D. decal is located on the forward face of
the passenger side cylinder head (Figure 2-2).
The decal provides the engine assembly/serial number and a
bar code. Similar decals are placed on the driver side cylinder
head and passenger side of the oil pan.
ENGINE SERIAL NUMBER
BAR CODE DECAL
Figure 2-2: Diesel Engine I.D. Tag Location
Service Tools
The special service tools described in this section are available
through the dealer tool program.
Specifications
Engine specifications for overhaul, adjustment, inspection and
torque requirements are provided at the end of this section.
05745159
LUBRICANTS/SEALANTS/COOLANT

Engine Oil

Recommended engine oil for the GM built, diesel engines used
in Hummer vehicles, is API classification CF-4 (Figure 2-3).
Base stock or synthetic oils are equally acceptable.
Oil viscosity recommendations are:
¥ Use 15W-40 at ambient temperatures from 0¡F
(-188¡C) to above 100¡F (401¡C).
¥ Use 30W at ambient temperatures above 32¡F (0¡C).
¥ Use 10W-30 at ambient temperatures below 60¡F
(165¡C).
Do not use 10W-40, or any other oil that is not specifically rec-
ommended. Use recommended oils only for lubrication pur-
poses during repair and overhaul.
AM General suggests using Quaker State FCI-Universal HDX
Engine Oil 15W-40 grade or equivalent.
HOT
WEATHER
°C
°F
+100 +36
+16
+60
+32
0
-18
0
-20
-29
SAE 10W-30
COLD
API CG-4, SJ/CD QUALITY PREFERRED
WEATHER
DO NOT USE SAE 10W-40 GRADE OIL,
OR ANY OTHER GRADE NOT RECOMMENDED
Figure 2-3: Oil Viscosity Chart
Engine 2-3
SAE 30W
SAE 15W-40
PREFERRED