Liquid Cooled Vertical Crankshaft Service Manual

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 oil pan.
The oil pump maintains high oil flow and oil pressure,
even at low speeds and high operating temperatures.
A pressure relief valve in the oil pan limits the
maximum pressure of the system.
Service
The oil pan 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.
Figure 6-1. Oil Container Logo.
The top portion of the symbol shows service class such
as API SERVICE CLASS SJ. The symbol may show
additional categories such as SH, 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.
Checking Oil Level
The importance of checking and maintaining the proper
oil level in the crankcase cannot be overemphasized.
Check oil BEFORE EACH USE as follows:
1. Make sure the engine is stopped, level, and cool
so the oil has had time to drain into the sump.
2. Clean the area around the oil fill cap/dipstick
before removing it. This will help to keep dirt, grass
clippings, etc., out of the engine.
NOTE: Using other than service class SG, SH, SJ, or
higher oil or extending oil change intervals
longer than recommended can cause engine
damage.
A logo or symbol on oil containers identifies the API
service class and SAE viscosity grade. See Figure 6-1.
LV560, LV625, LV675
*
*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).
**
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