12320-ZY3-405ZA Honda SEE PART DETAILS - PRI; COVER, L. CYLINDER HEAD *NH8* (Honda Code 8265902). (DARK GRAY)

Introduction
Table 1
Revision History
Revision Summary of Changes
04 Differential pressure limit on the Section "Filter Pressure Delta Above 12.4 kPa (50 inch of H2O)" has been updated.
03 New prefixes added to effectivity. The fumes disposal filter separates oil from the crankcase atmosphere.The filter has a blower that draws the crankcase atmosphere through the breathers on the side of the engine. Large droplets of oil are trapped by the breathers. The oil in the breathers is returned to the crankcase. Small particles of oil are still entrained in the atmosphere.
Illustration 1 g06433621
Operation of the fumes disposal filter
(1) Flow of the crankcase atmosphere
(2) Flow of the air to the turbocharger (optional)
(3) Flow of the oil that is separated from the crankcase atmosphere
(4) Bypass portAtmosphere (1) is drawn into the fumes disposal filter. The filter separates the oil from the crankcase atmosphere. The oil (3) is returned to the oil pan. Clean air (2) is sent to the air inlet of the turbocharger. The G3500 product requires ingesting the fumes to meet the published engine efficiencies.If power to the blower is lost during engine operation, the crankcase atmosphere is purged through bypass port (4).Note: If the engine is shut down and the fumes disposal system continues to run, no damage should occur to the engine. The system will continue to maintain an atmospheric condition in the crankcase.The fumes disposal filter provides the following benefits:
Reduction of pollution
Compliance to government regulations of emissions
Reduction of oily residue on surfaces
Economical recirculation of oil that would otherwise be lost
Low maintenanceThe fumes disposal filter group contains a filter cartridge, blower motor, and pressure gauge which are all serviceable. Refer to the 191-2304 Fumes Disposal Filter Gp which breaks down into the following parts:
196-9812 Fumes Disposal Blower Gp
191-2373 Breather Filter Element (CRANKCASE)
191-2302 Oil Filter Pressure Differential Gauge Gp (FUMES DISPOSAL)Note: The air lines and the fittings are supplied by the customer. No bypass line is needed. Leave the bypass port on bottom of the filter unit open to atmosphere without a hose attached. For dusty environments, please note that the filter life may be shortened due to the open bypass port which is drawing in air.Do not perform any procedure in this Special Instruction until you read and understand this information.Safety Section
Improper operation, lubrication, maintenance, or repair of this product can be dangerous and could result in injury or death.The information, specifications, and illustrations in this publication are based on information that was available at the time that the publication was written. The specifications, torques, pressures, measurements, adjustments, illustrations, and other items can change at any time. These changes can affect the service that is given to the product. Obtain the complete and most current information before you start any job. Cat dealers have the most current information available.Work safely. Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools to perform these functions properly.Safety precautions and warnings are provided in this instruction and on the product. If these hazard warnings are not heeded, bodily injury or death could occur to you or to other persons. Caterpillar cannot anticipate every possible circumstance that might involve a potential hazard.Therefore, the warnings in this publication and the warnings that are on the product are not all inclusive. If the tools, the procedure, the work method, or your actions are not recommended by Caterpillar, ensure that the tools and your actions are safe for you and for others.Ensure that all personnel are safe when using a tool, procedure, work method, or operating technique not recommended by Caterpillar. Ensure that the product will not be damaged or the product made unsafe by the operation, lubrication, maintenance, or the repair procedures that are used.
Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.
When removing a major component or attachment, ensure that it is properly blocked or secured before removing mounting hardware. An assembly that is disconnected without proper blocking may shift or fall, resulting in serious injury or death of personnel or machine damage.
Personal injury or death can result from improper maintenance procedures. To avoid injury or death, follow the procedures exactly as stated below.
Personal injury can result from improper handling of chemicals.Make sure you use all the necessary protective equipment required to do the job.Make sure that you read and understand all directions and hazards described on the labels and material safety data sheet of any chemical that is used.Observe all safety precautions recommended by the chemical manufacturer for handling, storage, and disposal of chemicals.
Components and Reference Dimensions
Illustration 2 g06255734
Components of the 191-2304 Fumes Disposal Filter Gp
(1) Differential pressure gauge
(2) Blower and motor
(3) Silencer and air outlet (Remove if operating with ester based engine oils)
(4) Filter element
(5) Bracket with mounting holes
(6) Oil drain
(7) Bypass port
(8) Inlet for t