This Article is about The Assembly of ISUZU Engine Vacuum Pump
ISUZU US-IDSS Diagnostic Service Truck Diagnostic System [06.2021]
Vacuum Pump Removal
1.Remove the vacuum returm hose from the front vacuum pipe.
1.Vacuum return hose
2.Front vacuum pipe
2.Remove the vacuum hose from the front vacuum pipe.
3.Remove the oil feed pipe from the vacuum pump.
1.Vacuum hose
2.Oil feed pipe
4.Remove the vacuum pump from the gear case cover.
Disassembly
1.Remove the 3 tightening bolts.
NOTE: If the case has been removed, perform any procedures with a soft, clean oil mat, etc., placed below as parts may fall out and otherwise be damaged.
2. Remove the housing from the plate.
NOTE: Tighten the 3 bolts for separating the vacuum pump until they are flush with the plate mounting surface.
1.Plate mounting surface NOTE:
Evenly tap the heads of the separation bolts with aplastic hammer until the housing separates from the knock pin.
CAUTION: The internal vane may be damaged if the vacuum pump falls, so take care not to raise it too high from the working table with the oil mat spread over it.3. Place alignment marks on the vane and rotor.
Legend
1. Alignment marks CAUTION: Make sure to place alignment marks in the original location of the vane so it can be reused if, after inspection, no abnormal conditions are found.
4. Remove the vane from the rotor.
Legend1.Vane
5.Remove the rotor from the shaft.
1.Inspect the vane.
CAUTION: Replace the vane if there are scratches large enough for the claws to catch or if the vane thickness is 4.5mm or less.
Legend1. Vane2. Flaw
3. Worn point
4. Measurement point
2. Inspect the housing.
CAUTION: If the sliding surface has scratches large enough for the claws to catch, replace the vacuum pump as an assembly.
Legend
1. Sliding surface
3. Inspect the plate.
CAUTION: If the sliding surface has scratches large enough for the claws to catch, replace the vacuum pump as an assembly.
Isuzu G-IDSS Diagnostic Service System [03.2022]
1
Legend
1. Sliding surface
4. Inspect the rotor.
CAUTION: If the sliding surface has scratches large enough for the claws to catch, replace the vacuum pump as an assembly.
he
1. Sliding surface
5. Inspect the shaft.
CAUTION: If abnormal conditions such as shaft looseness or rough rotation are found, replace the vacuum pump as an assembly.
1. Shaft Reassembly
1. Install the new O-ring to the plate.
NOTE: Lightly apply engine oil to the O-ring, and firmly install to the plate groove.
1. Shaft CAUTION: To prevent the vane from falling, first install the rotor to the shaft, and then install the vane.
3. Install the vane to the rotor.
NOTE:
· If installing a new vane, install with the R section facing outward.
· First align the vane and rotor alignment marks, and then set the R section near the O-ring facing outward before finally pressing on the lower side of the vane with your fingers.
CAUTION:
. Take care not to let the vane ride up on the shaft cam ring.
· Do not reuse the vane if it has been dropped.
1. Same plane
4. Install the housing to the plate.
NOTE:
· Confirm that the vane does not protrude past the upper section of the rotor, and then align the knock pin positions and install while rotating the housing to the left and right.
· Confirm that the clearance of the housing and plate surface is 0.5 mm or less.
CAUTION: Do not rotate the gear facing sideways as it wi damage the vane.
NOTE: Face the gear upwards and confirm that it rotates smoothly.
CAUTION: If an abnormal condition such as interference is found, either reassemble from the beginning, or replace the vacuum pump as an assembly.
Installation
1. Install the new O-ring to the vacuum pump.
NOTE: Lightly apply engine oil to the O-ring, and firmly install to the vacuum pump groove.
1.O-ring
2. Install the vacuum pump to the gear cas Tightening torque:27.5 N-m(2.8 kg-m/20 I
3. Install the oil feed pipe to the vacuum pu NOTE: Do not reuse the oil feed pipe gasket.
Tightening torque:12 N-m{1.2kg-m/104 Ib
Legend
1.Vacuum hose
2.Oil feed pipe
5.Install the vacuum return hose to the front vacuum pipe.
Isuzu E-IDSS Diagnostic Service System [03.2021]
Legend
1.Vacuum return hose
2.Front vacuum pipe
6.Inspect negative pressure of the vacuum pump.
Legend
1.Vacuum hose b.Install the vacuum gauge to the vacuum hose as shown in the diagram.
Legend
1. Vacuum gauge c. Start the engine, let it run in a no-load idling condition, and confirm it is the specified value or more.
Specified value:90 kPa {675 mmHg}
d. Remove the vacuum gauge, connect the vacuum hose to the original position, and then lower the cab.
a. Tilt the cab, and remove the vacuum hose from the front right section of the engine.
没有评论:
发表评论