0438559 JOHNSON FUEL PUMP ASSY., Upper

Illustration 1 g00285531
Typical example
Before operation, the pump must be lubricated with clean engine oil and the pump must turn freely by hand or damage to parts can be the result.
(1) Diameter of new drive shaft ... 22.217 0.005 mm (0.8747 0.0002 inch)Diameter of new idler shaft ... 22.217 0.005 mm (0.8747 0.0002 inch) (2) Gears Length of new gears ... 140 0.025 mm (5.5118 0.0010 inch) Depth of bores for new gears ... 140.127 0.020 mm (5.5168 0.0008 inch) (3) 2S-2760 Spring Length under test force ... 117.8 mm (4.64 inch) Test force ... 489 24 N (110.0 5.5 lb) Free length after test ... 153 mm (6.0 inch) Outside diameter ... 27 mm (1.1 inch)Note: The 2S-2760 Spring is for the relief of oil pressure.
Illustration 2 g00285533
Illustration 3 g00285532
Oil pump body (4) Bearing junction (5) Position of bearing junction from the centerline through bearing bores ... 30 15 degreesNote: Bearings should be installed so that the edge of the bearing is flush with the outside of the oil pump body. The bearings should also be installed so that the edge of the bearing is flush with face (6) .Two-Section Gear Pump
Illustration 4 g00285526
Typical example
Before operation, the pump must be lubricated with clean engine oil and the pump must turn freely by hand or damage to parts can be the result.
(A) Body assemblyTest on test stand with SAE 10W oil at 49 °C (120 °F) Rotation from the drive end ... counterclockwise Pump speed ... 2550 RPM Output ... 193 L/min (51 US gpm) (1) Drive shaft Diameter of the drive shaft (new) ... 20.320 0.005 mm (0.8000 0.0002 inch) Bore in bearings for drive shaft (new) ... 20.361 0.008 mm (0.8016 0.0003 inch) (2) Idler shaft Diameter of idler shaft (new) ... 20.320 0.005 mm (0.8000 0.0002 inch) Bore in bearings for idler shaft (new) ... 20.361 0.008 mm (0.8016 0.0003 inch) (3) Pump gears Length of gears (new) ... 65.07 0.05 mm (2.562 0.002 inch) Depth of bores for gears ... 65.197 0.020 mm (2.5670 0.0010 inch) (B) Body assemblyTest on test stand with SAE 10W oil at 49 °C (120 °F) Rotation from the drive end ... counterclockwise Pump rpm ... 2550 rpmFlow specifications for low pressure Output ... 272 L/min (72 US gpm) Pressure ... 310 kPa (45 psi)Flow specifications for high pressure Output ... 144 L/min (38 US gpm) Pressure ... 560 kPa (81 psi) (4) Drive shaft Diameter of drive shaft (new) ... 22.217 0.005 mm (0.8747 0.0002 inch) Bore in bearings for drive shaft (new) ... 22.258 0.008 mm (0.8763 0.0003 inch) (5) Idler shaft Diameter of idler shaft (new) ... 22.217 0.005 mm (0.8747 0.0002 inch) Bore in bearings for idler shaft (new) ... 22.258 0.008 mm (0.8763 0.0003 inch) (6) Gears Length of gears (new) ... 79.375 0.025 mm (3.1250 0.0010 inch) Depth of bores for gears (new) ... 79.502 0.020 mm (3.1300 0.0008 inch) (7) Drive shaft Diameter of drive shaft (new) ... 22.217 0.005 mm (0.8747 0.0002 inch) Bore in bearings for drive shaft (new) ... 22.258 0.008 mm (0.8763 0.0003 inch) (8) Idler shaft Diameter of idler shaft (new) ... 22.217 0.005 mm (0.8747 0.0002 inch) Bore in bearings for idler shaft (new) ... 22.258 0.008 mm (0.8763 0.0003 inch)
Illustration 5 g00285527
Oil Pressure Relief Valve (9) 2S-2760 Spring Length under test force ... 117.8 mm (4.64 inch) Test force ... 489 24 N (110.0 5.5 lb) Free length after test ... 153 mm (6.0 inch) Outside diameter ... 27 mm (1.1 inch)Note: The 2S-2760 Spring is for the relief of oil pressure.
Illustration 6 g00527397
Pump Body (10) Bearing installation depth ... 1.52 mm (0.060 inch) (11) The position of the bearing joint from the centerline through the bearing bores is the following angle. ... 30 15 degrees
Illustration 7 g00527400
Spacer Plate (12) Bearing installation depth ... 0.76 mm (0.030 inch) (13) Oil holesNote: The bearings should be located with the oil holes on the horizontal centerline slots.
Illustration 8 g00527401
Pump Body (14) Position of bearing joint from the centerline through bearing bores ... 30 15 degreesNote: Install the