Kohler COMMAND CH18-745 User Manual download pdf (Page 106)

6.1

Section 6

Lubrication System

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).

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