Kohler Command PRO CH749, Service Manual

Page: 71 / 154

6.1
6
Figure 6-1. Viscosity Grade Table.
Section 6
Lubrication System
General
This engine uses a full pressure lubrication system.
This system delivers oil under pressure to the
cranksha
ft , camsha ft , and connecting rod bearing
surfaces. In addition to lubricating the bearing
surfaces, the lubrication system supplies oil to the
hydraulic valve li
ft ers.
A high-e ffi ciency gerotor pump is located in the
closure plate. The oil pump maintains high oil
fl ow and oil pressure, even at low speeds and high
operating temperatures. A pressure relief valve limits
the maximum pressure of the system.
Service
The closure plate must be removed to service the oil
pickup, the pressure relief valve and the oil pump.
Refer to the appropriate procedures in Sections 8 and
9.
Oil Recommendations
Using the proper type and weight of oil in the
crankcase is extremely important; so is checking oil
daily and changing the oil and
fi lter regularly.
Use high-quality detergent oil of API (American
Petroleum Institute) service class SJ or higher. Select
the viscosity based on the air temperature at the time
of operation as shown in the following table.
NOTE: Using other than service class SJ or higher oil,
or extending oil change intervals longer than
recommended can cause engine damage.
NOTE: Synthetic oils meeting the listed classi fi cations
may be used with oil changes performed
at the recommended intervals. However, to
allow piston rings to properly seat, a new or
rebuilt engine should be operated for at least
50 hours using standard petroleum based oil
before switching to synthetic oil.
A logo or symbol on oil containers identi fi es the API
service class and SAE viscosity grade. See Figure 6-2.
Figure 6-2. Oil Container Logo.
The top position of the symbol shows service class
such as
API SERVICE CLASS SJ . The symbol may
show additional categories such as SH, SG/CC, or
CD . The center portion shows the viscosity grade such
as SAE 10W-30. If the bo tt om portion shows Energy
Conserving , it means that oil is intended to improve
fuel economy in passenger car engines.
°F -20 0 20 32 40 60 50 80 100
°C -30 -20 -10 0 10 20 30 40
5W-30
10W-30
Kohler 10W-30
SAE 30