WHATS INSIDE MY DODGE DIESEL VACUUM PUMP
WHATS INSIDE AND HOWS IT ALL WORK.THE VACUUM PUMP DRIVES OFF THE TIMING GEARS INSIDE THE FRONT OF THE ENGINE.WHEN YOU REMOVE THE VACUUM PUMP IT WILL NOT INTERFERE WITH THE TIMING GEARS OR INJECTION PUMP TIMING AND CAN GO BACK INTO PLACE WITH THE DRIVE GEAR IN ANY POSITION.THE VACUUM PUMP COUPLES UP WITH A DRIVE GEAR SIMILAR TO THE VACUUM PUMP COUPLER GEAR IN A DISC AND DRIVES THE POWER STEERING PUMP.THE POWERSTEERING PUMP DRIVES THE HYROBOOST BRAKE UNIT ON LATER MODELS USING HYDRAULIC PRESSURE AND ALSO THE STEERING GEAR BOX.ON EARLIER MODELS,THE BRAKE BOOSTER IS VACUUM OPERATED AND DEPENDS ON VACUUM FROM THE VACUUM PUMP TO SUPPLY THE POWER BRAKE SYSTEM.THE VACUUM ALSO OPERATES THE DASH VENTS ACTUATOR MOTOR THAT CHANGES THE VENTS FROM DEFROST TO FLOOR.THE VACUUM ALSO OPERATES SOME OF THE CRUISE CONTROL SYSTEM AND 4X4 INTERLOCK ON THE FRONT AXLE.A SMALL LEAK IN ANY OF THE VACUUM SUPPLY HOSES WILL LEAVE THE VACUUM SYSTEM INOPERATIVE.THE SEAL MOST COMMON TO LEAK ENGINE OIL AND BLOW OIL BACK UNDER THE TRUCK IS FOUND WHERE THE POWER STEERING PUMP ENTERS THE VACUUM PUMP.THE REPAIR KIT OFFERED IS TO REPAIR THAT OIL LEAK AND USES A NEW DESIGN DUAL LIP SEAL THAT WORKS GREAT AND IS EASY TO INSTALL ONCE THE PUMP IS OUT OF THE TRUCK.BELOW I IDENTIFY THE INTERNAL PARTS OF THE VACUUM PUMP JUST IN CASE YOU ARE INTERESTED.ALSO I IDENTIFY SEVERAL STYLES OF PUMPS THAT SHOULD HELP YOU IDENTIFY THE PUMP IN YOUR TRUCK.

 
VACUUM PUMP PARTS
 
CRACKED REAR HOUSING
 
. NOTE***THIS IS THE SEAL WHERE THE POWER STEERING PUMP CONNECTS TO THE VACUUM PUMP VERY COMMON TO LEAK.THE RE SEAL KIT OFFERED FOR $59.95 IS COMPLETE WITH EVERYTHING NEEDED TO RE SEAL THE VACUUM PUMP.THE ADDITIONAL TOOLS AND PARTS COVERED IN THE SITE ARE FOR OTHER REPAIRS AND NOT NEEDED TO REPAIR THE VACUUM PUMP LEAK
 
SEAL
 
FRONT SECTION WITH VEINS IN
 
MOUNTING GASKET AND ORINGS
 
1991 THRU 95 3 SECTION PUMP
 
1995 THRU 97 EARLY 2 SECTION PUMP
 
1996 THRU 98 2 SECTION W/SHORT NIPPLE
 
1998 THRU 2002 LATE 2 SECTION
THE FRONT AND REAR SECTIONS OF THE TWO SECTION PUMP ARE APART,THE BLACK SQUARES ARE VEINS AND ROTATE IN THE BARREL OPERATING ON CENTRIFICAL FORCE FROM THE ROTOR CREATING VACUUM SPINNING IN OIL FED TO THE BARREL BY A SMALL HIGH PRESSURE STEEL OIL LINE ON THE BOTTOM OF THE PUMP.THE LARGE GEAR IS DRIVEN BY TIMING GEARS AND THE SMALL COUPLING GEAR GOES INTO THE DISC SHOWN TO COUPLE WITH THE POWER STEERING PUMP GEAR.THE ROUND BLACK FITS INTO THE ALUMINUM SEAL RETAINER AND THE LARGE O RING SEALS THE TWO WHEN THEY MATE.THE SMALL ORING GOES ON THE SEAL RETAINER AND SEALS IT TO THE REAR SECTION WHEN PRESSED TOGETHER.COMMON FAILURES ARE CAUSED BY THE POWER STEERING SUPPORT BRACKET FALLING OFF OR NOT PUT BACK ON CAUSING THE VACUUM PUMP TO BREAK IN HALF AT THE REAR SECTION.4X4 TRUCKS ARE KNOWN TO BREAT THE COUPLER GEAR TIPS WHEN OVER SIZED TIRES ARE USED AND ALSO SNOW PLOWS WILL CAUSE THE GEAR TO BREAK DUE TO THE ADDED LOAD TO THE POWER STEERING PUMP TO TURN THE TIRES WITH THE ADDED WEIGHT OF THE SNOW AND PLOW.