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6.1
Section 6
Lubrication System
6
Section 6
Lubrication System
General
This engine uses a full pressure lubrication system. This
system delivers oil under pressure to the crankshaft,
camshaft and connecting rod bearing surfaces. In
addition to lubricating the bearing surfaces, the
lubrication system supplies oil to the hydraulic valve
lifters.
A high-efficiency gerotor pump is located in the closure
plate. The oil pump maintains high oil flow 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 9 and 10.
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 filter regularly.
Use high-quality detergent oil of API (American
Petroleum Institute) service class SG, SH, 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 SG, SH, SJ or
higher oil, or extending oil change intervals
longer than recommended can cause engine
damage.
NOTE: Synthetic oils meeting the listed
classifications 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 identifies the API
service class and SAE viscosity grade. See Figure 6-1.
CH18-745
Figure 6-1. 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 bottom portion shows “Energy
Conserving,” it means that oil is intended to improve fuel
economy in passenger car engines.
*
*Use of synthetic oil having 5W-20 or 5W-30 rating is
acceptable, up to 4°C (40°F).
**Synthetic oils will provide better starting in extreme cold
below -23°C (-10°F).
**