Kohler Command CV730 User Manual download pdf (Page 26)

3.3

Section 3

Troubleshooting

• Check the condition of the oil. Drain the oil into a

container - the oil should flow freely. Check for

metal chips and other foreign particles.

Sludge is a natural by-product of combustion; a

small accumulation is normal. Excessive sludge

formation could indicate overrich carburetion,

weak ignition, overextended oil change intervals

or wrong weight or type of oil was used, to name

a few.

NOTE: It is good practice to drain oil at a

location away from the workbench. Be

sure to allow ample time for complete

drainage.

Cleaning the Engine

After inspecting the external condition of the engine,

clean the engine thoroughly before disassembling it.

Also clean individual components as the engine is

disassembled. Only clean parts can be accurately

inspected and gauged for wear or damage. There are

many commercially available cleaners that will

quickly remove grease, oil, and grime from engine

parts. When such a cleaner is used, follow the

manufacturer’s instructions and safety precautions

carefully.

Make sure all traces of the cleaner are removed before

the engine is reassembled and placed into operation.

Even small amounts of these cleaners can quickly

break down the lubricating properties of engine oil.

Basic Engine Tests

Crankcase Vacuum Test

A partial vacuum should be present in the crankcase

when the engine is operating. Pressure in the

crankcase (normally caused by a clogged or

improperly assembled breather) can cause oil to be

forced out at oil seals, gaskets, or other available spots.

Crankcase vacuum is best measured with either a

water manometer, or a vacuum gauge (see Section 2).

Complete instructions are provided in the kits.

To test the crankcase vacuum with the manometer:

1. Insert the stopper/hose into the oil fill hole. Leave

the other tube of manometer open to atmosphere.

Make sure the shut off clamp is closed.

2. Start the engine and run at no-load high speed

(3200 to 3750 RPM).

3. Open the clamp and note the water level in the

tube.

The level in the engine side should be a

minimum of 10.2 cm (4 in.) above the level in the

open side.

If the level in the engine side is less than

specified (low/no vacuum), or the level in the

engine side is lower than the level in the open

side (pressure), check for the conditions in the

table below.

4. Close the shut off clamp before stopping the

engine.

To test the crankcase vacuum with the Vacuum/

Pressure Gauge Kit:

1. Remove the dipstick or oil fill plug/cap.

2. Install the adapter into the oil fill/dipstick tube

opening.

3. Push the barbed fitting on the gauge solidly into

the hole in the adapter.

4. Start the engine and bring it up to operating

speed (3200-3600 RPM).

5. Check the reading on the gauge. If the reading is

to the left of “0” on the gauge, vacuum or

negative pressure is indicated. If the reading is to

the right of “0” on the gauge, positive pressure is

present.

Crankcase vacuum should be 4-10 (inches of

water). If the reading is below specification, or if

pressure is present, check the following table for

possible causes and remedies.

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Kohler Command CV730 User Manual Page 26

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