TM 10-3930-671-24 The cartridge can also be cleaned with compressed  air, but it is important to use the following guidelines: ALWAYS keep  air  pressure  adjusted  to  less  than  30 psi (2 Bar). WARNING Wear   protective   glasses   or   a   face protector    whenever    air    hoses    are used.    Never  use  air  pressure  that  Is more    than    2    Bar    (30    pounds    per square  inch)  and  make  sure  the  air line  Is  equipped  with  a  water  filter  to prevent damage to parts. • ALWAYS keep the tip of the air nozzle or air hose at least 2 inches (50mm) from the paper portion of the cartridge. • ALWAYS  blow  the  cartridge  clean  from  the inside out. CAUTION Failure   to   comply   with   the   above guidelines  will  damage  the  cartridge and  lead  to  severe  engine  damage. Replace the cartridge If in doubt! • Do not wash or oil cartridge. Wipe   inside   screen,   cartridge   gasket   surface,   inside cover, and mounting seat before installing element. Place cartridge on mounting seat make sure outer edge of cartridge fits inside edge of bottom plate. Replace  cover  and  assemble  wing  bolt  finger  tight  to insure air filter seal. REPLACING NEW CARTRIDGE Replace immediately if bent, crushed, or damaged.  Dry- type  air  cleaners  are  efficient  only  as  long  as  top  and bottom sealing edges are not damaged. Also,  surface  of  air  cleaner  base  and  cover  where  air cleaner cartridge seals must be clean and not damaged, such as dents or bends. Often   in   cleaning   the   cartridge   it   is   tapped   against surfaces that are not flat, thus damaging sealing edges. Regardless   of   how   clean   the   paper   is,   if  edges  are damaged, dirt will enter the engine. The   element   should   be   replaced   every   250   hours   or when  servicing  does  not  result  in  full  power  recovery whichever occurs first. Under extreme dust conditions, more frequent replacement will be required. NOTE A  1/4  teaspoon  of  dust  per  hour  can ruin an engine In one 8 hour day. PCV SYSTEM All connections must be air tight. Blow-by  circulates  into  the  intake  manifold  maintaining crankcase pressure within a narrow range regardless of operating speed or load. servicing of the PCV system is confined to checking the conditions of the hoses and connections. CHECK OIL PRESSURE Note   oil   pressure   gauge   which   should   indicate   the following pressure range at full throttle and a minimum of 0.5 Bar (7 pounds) pressure at idling speed. MODEL OIL PRESSURE TMD 2.8 - 4.1 Bar (40-60 PS) Higher  oil  pressures  may  be  experienced  during  cold starts. F-164