G343 INDUSTRIAL ENGINE Caterpillar

Air Induction And Exhaust System

Usage:

Air Cleaner Service Indicator

Checking Air Cleaner Service Indicator

Before starting, check the window of the indicator. If the red piston is locked in the raised position, service the air cleaner as outlined.

NOTE: Have spare elements on hand to install while cleaning used elements.

Show/hide table

NOTICE

Service the air cleaner with the engine STOPPED.

PISTON LOCKED IN RAISED POSITION

Single Stage Air Cleaner

Servicing Single Stage Air Cleaner

1. Remove the air cleaner cover and element.

REMOVING COVER AND FILTER ELEMENT

2. Cover the air inlet opening to prevent dirt from entering the engine.

3. Clean the inside of the air cleaner cover and the air cleaner body.

CLEANING INSIDE OF AIR CLEANER
1. Air Inlet Cover

4. Inspect the replacement element for damage and dirt.

5. Remove the covering from the air inlet opening.

6. Install the element.

INSTALLING AIR CLEANER ELEMENT

7. Install the air cleaner cover.

8. Reset the service indicator piston by pushing the reset button. (See the instructions for air cleaner element cleaning).

RESETTING AIR INDICATOR PISTON

Two Stage Air Cleaner

Emptying Dust Collector Cup

1. Loosen the clamping bolt on the lower body.

2. Remove and empty the dust collector cup.

3. Inspect and install the seal; install a new seal if necessary.

REMOVING DUST CUP
1. Seal

4. Inspect the tubes in the lower body. If dirty, clean the tubes with a round bottle brush.

5. Install the dust collector cup.

Cleaning The Lower Body

1. Remove the dust collector cup.

2. Loosen the clamping bolt on the upper body.

REMOVING LOWER BODY
1. Seal

3. Remove the lower body. Clean the tubes from both ends.

4. Inspect and install the upper body seal. Install a new seal if it is damaged.

Installing Replacement Filter Element

1. Remove the cover.

REMOVING COVER AND INNER COVER

2. Remove the inner cover and filter element. In cold weather, a stuck inner cover may be removed by warming the air cleaner cover to 70-75°F (21-24°C).

REMOVE ELEMENT

3. Clean all parts of the air cleaner.

4. Inspect the replacement element for damage and cleanliness.

5. Install the element, inner cover, and wing nut. Tighten the wing nut to prevent dust from bypassing the filter element.

6. Install the cover.

If, after servicing the air cleaner, the exhaust smoke and/or loss of power continues; or the service indicator locks in the raised position, discard that element and install a new element. Install a new element at least once a year.

Cleaning Used Air Cleaner Elements

Cleaning With Pressure Air

1. Use clean, dry air-100 PSI maximum. Hold the nozzle at least one inch from the element and at a slight angle. (A direct blast can rip the pleating.)

CLEANING ELEMENT WITH AIR

2. Direct the air stream along the complete length of each pleat on the CLEANEST side of the element. (This will loosen the dirt from the dirtier side.)

3. Blow the loosened dirt from the DIRTY side.

4. Direct the air from the CLEAN side through to the DIRTY side to remove dirt blown into the pleating.

Cleaning With Water

1. Use clean water at no more than 40 PSI. Do not use a nozzle.

2. Direct the water stream along the complete length of each pleat on the CLEAN side of the element.

CLEANING ELEMENT WITH WATER

3. Direct water along the complete length of each pleat on the DIRTY side of the element.

4. Rinse the CLEAN side of the element.

5. Allow the cleaned element to dry thoroughly.

Cleaning With Detergent

1. Wash both sides of the element in a solution of warm water and non-sudsing household detergent.

2. Rinse the CLEANEST side of the element with clean water (40 PSI maximum) along the complete length of each pleat.

WASHING ELEMENT WITH DETERGENT

3. Rinse the opposite side of the element along the complete length of each pleat.

4. Rinse the first side again to remove all loosened dirt.

5. Allow the cleaned element to dry thoroughly.

Storing Cleaned Elements

1. Hold the dried element in front of a lighted electric bulb. Carefully inspect the element for tiny, pinpoints of light. Any light showing indicates a pleat has ruptured and will tear with further use. Discard the element.

INSPECTING ELEMENT

2. Wrap usable elements in heavy paper.

3. Store the wrapped element in a dry, clean place.

Precleaner

Servicing

When the precleaner body is 3/4 full, remove and empty the precleaner. Wash the precleaner in water.

Engine Valve Lash

Preparing To Set Valve Lash

1. Stop the engine and allow it to cool.

2. Remove the flywheel housing timing cover.

REMOVING TIMING COVER

3. Wipe the base of the valve cover to keep dirt from falling into the valve mechanism.

4. Disconnect the spark plug lead wire from each transformer coil.

5. Remove the rubber spark plug covers and disconnect the insulator from each spark plug.

REMOVE SPARK PLUG LEAD WIRES, COVERS AND INSULATORS

6. Remove the valve cover plate.

7. Bar the flywheel in the direction of normal rotation. Align the "TC 1" timing mark with the flywheel housing timing pointer.

TIMING MARK

Numbering Of Cylinders

CYLINDER AND VALVE LOCATION

Checking Adjustment

1. Observe the rockers for cylinder No. 1. Determine if the piston is on the compression or exhaust stroke.

Compression stroke: Exhaust and inlet valves are closed.

Exhaust stroke: Exhaust valves are open, inlet valves are closed.

2. With No. 1 cylinder on COMPRESSION stroke, check the lash of the following valves and adjust valve lash if necessary:

3. Bar the flywheel in the direction of normal rotation for one revolution. Align the "TC 1" timing mark with the timing pointer on the flywheel housing.

4. With No. 1 cylinder on EXHAUST stroke, check the lash of the following valves and adjust valve lash if necessary.

Adjusting Valve Lash

1. Insert a cross point (Phillips) screwdriver in the hole in the side of the cam follower and engage the cam follower adjuster gear.

2. Turn the screwdriver clockwise to increase lash or counterclockwise to decrease lash.

ADJUSTING VALVE LASH

3. Recheck the lash.

CHECKING VALVE LASH

Valve Rotators

Checking Rotation

After checking all valve clearances, and before installing the valve covers:

1. Check the wear pattern of each cam follower. Each cam follower should turn slowly each time the valve closes. However, cam follower rotation does not necessarily indicate valve rotation.

If it is suspected a valve is not rotating, contact your Caterpillar dealer. Repairs must be made to prevent the valves from burning.

If all valves appear to rotate properly, proceed as follows:

2. Install a new valve cover gasket.

3. Install the valve cover.

4. Install the spark plug insulators and covers.

5. Connect each spark plug to its transformer. Be sure each wire is fully inserted in its respective transformer.

6. Install the flywheel timing cover.