D346 MARINE 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.

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NOTICE

Service the air cleaner with the engine STOPPED.

PISTON LOCKED IN RAISED POSITION

Single Stage Air Cleaner

Servicing

1. Remove the air cleaner cover and filter element. On some engines, a soot filter may cover the filter element.

REMOVING COVER, SOOT FILTER AND FILTER ELEMENT

2. Cover the turbocharger 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 turbocharger inlet opening.

6. Install the element.

INSTALLING AIR CLEANER ELEMENT

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NOTICE

The reinforcing brace across the middle of panel type elements fits over the supporting bar of the turbocharger.

7. If a soot filter is used, place a new soot filter over the air cleaner element.

8. Install the air cleaner cover.

9. Reset the service indicator piston by pushing the reset button. See the instructions for cleaning the used air cleaner element.

RESETTING AIR INDICATOR PISTON

Cleaning Used Air Cleaner Elements

Cleaning With Pressure Air

1. Use clean, dry air - 40 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, pin-points 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.

WRAPPING ELEMENT FOR STORAGE

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

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- 40 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.

1. Remove the dust collector cover.

2. Remove and empty the dust collector body.

3. If necessary, wash the dust collector in water.

AIR CLEANER PRECLEANER

Engine Valve Lash
(D379, D398, D399 Engines)

Valve Lash

1. Stop the engine.

2. Remove the flywheel housing timing cover.

REMOVING TIMING COVER

3. Determine the direction of flywheel rotation. See the decal above the flywheel housing.

FLYWHEEL ROTATION DECAL

4. Wipe dirt from the base of the valve covers.

5. Remove the valve covers.

6. Bar the flywheel in the direction of normal rotation. Align the "TDC 1" timing mark for your engine, ("TDC 1-7", "TDC 1'11", or "TDC 1-15"), with the timing pointer on the flywheel housing.

BARRING FLYWHEEL

Checking Adjustment

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

Compression stroke: Both intake and exhaust valves are closed.

Exhaust stroke: Intake valve is closed, exhaust valve is opened.

NUMBERING OF CYLINDERS AND VALVES

2. With NO 1 CYLINDER ON COMPRESSION STROKE, check the lash of the following valves: Adjust if necessary. See the Lubrication and Maintenance Chart for correct valve lash.

CHECKING VALVE LASH

3. Bar the flywheel one revolution in the direction of normal rotation. Align the "TDC 1" timing mark for your engine, ("TDC 1-7", "TDC 1-11" or "TDC 1-15"), with the timing pointer on the flywheel housing.

4. With NO. 1 CYLINDER ON EXHAUST STROKE, check the lash for the following valves. Adjust if necessary. See the Lubrication and Maintenance Chart for correct valve lash.

Adjusting Valve Lash

1. Loosen the locknut on the adjusting screw.

2. Hold the locknut and turn the adjusting screw to obtain the proper lash.

3. Hold the adjusting screw and tighten the locknut.

4. Recheck the lash.

LOOSENING LOCKNUT

ADJUSTING VALVE LASH

Engine Valve Lash
(D346, D348, D349 Engines)

Preparing To Set Valve Lash

1. Stop the engine.

2. Remove the flywheel housing timing cover.

3. Wipe the base of the valve covers to keep dirt from getting into the valve mechanism.

4. Remove both valve covers.

5. Bar the flywheel in the direction of normal rotation. Align the "TC1" timing mark with the flywheel housing timing pointer.

6. Observe the rockers for cylinder No. 1. Determine if the piston is on COMPRESSION OR EXHAUST STROKE. COMPRESSION STROKE: Both inlet and exhaust valve rockers can be moved freely.

EXHAUST STROKE: Only inlet valve rockers move freely.

D349 ENGINE SHOWN

Inlet Valves: Located toward center of vee.

Exhaust Valves: Located toward outside of vee.

7. Refer to the tables below, and set only those valves specified in the appropriate table.

8. Bar the flywheel one revolution in the direction of normal rotation and align the flywheel TDC timing mark.

9. Set the remaining valves as specified in the remaining table.

Setting Valve Lash

1. Turn the adjusting screw clockwise to zero lash position: The precise position where rocking movement of the rocker can no longer be detected with finger pressure. Further turning of the adjusting screw beyond this point will begin raising the valve from the valve seat.

2. Turn each adjusting screw counterclockwise for the exact number of clicks shown in the Lubrication and Maintenance Chart.

3. After adjusting all of the valves specified in one of the two tables, bar the flywheel one revolution in the direction of normal rotation and adjust all of the valves specified in the other table.

FINDING ZERO LASH POSITION