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Engine Mechanical - 5.4L (3V): Maintenance Ford Expedition III

Mechanical 5 illustrations ~276 words

Lubrication System

The engine lubrication system operates as follows

  1. Oil is drawn into the oil pump through the oil pump screen cover and tube in the sump of the oil pan.
  2. Oil is pumped through the oil filter on the left front side of the cylinder block.
  3. Oil enters the main gallery where it is distributed to the crankshaft main journals and to both cylinder heads.
  4. From the main journals, the oil is routed through cross-drilled passages in the crankshaft to lubricate the connecting rod bearings. Controlled leakage through the crankshaft main bearings and connecting rod bearings is slung radially outward to cool and lubricate the cylinder walls as well as the entire connecting rod, piston and piston ring assembly.
  5. The left cylinder head is fed from a drilling into the supply passage feeding the main gallery at the front of the cylinder block. The right cylinder head is fed from a drilling into the rear of the main gallery. Main gallery pressure is reduced as it enters the cylinder head galleries through fixed serviceable orifices, located at the upper part of the feed passages. It is this reduced pressure in the cylinder head galleries which feeds the camshaft journals, the hydraulic lash adjusters and the primary and secondary timing chain tensioners.
  6. The oil pressure feed for the VCT solenoids, VCT housings and camshaft phaser and sprockets is not reduced.
  7. The camshaft lobe and roller followers are lubricated by splash created through valve train operation.

Scheme 58

Scheme 58: Engine Assembly
Scheme 58: Engine Assembly
ItemPart NumberDescription
16714Oil filter
26A642Oil cooler (if equipped)
39278Engine Oil Pressure (EOP) switch
46884Oil filter adapter
56622Oil pump screen and pickup tube
66621Oil pump
76L266ATiming chain tensioner - RH
86C260Variable Camshaft Timing (VCT) housing - RH
96M280VCT oil control solenoid assembly - RH
106B284Front camshaft bearing cap - RH
116L266BTiming chain tensioner - LH
126C261VCT housing - LH
136M280VCT oil control solenoid assembly - LH
146B284Front camshaft bearing cap - LH
156050Cylinder head - LH

PART DESCRIPTION CHART

Scheme 59

Scheme 59: Camshaft Phaser and Sprocket, Camshaft Phaser and Sprocket Bolt and Camshaft
Scheme 59: Camshaft Phaser and Sprocket, Camshaft Phaser and Sprocket Bolt and Camshaft
ItemPart NumberDescription
16279Camshaft phaser and sprocket bolt
26256Camshaft phaser and sprocket
3Camshaft

PART DESCRIPTION CHART

Scheme 60

Scheme 60: LH Variable Camshaft Timing (VCT) Housing, VCT Solenoid and Timing Chain Tensioner
Scheme 60: LH Variable Camshaft Timing (VCT) Housing, VCT Solenoid and Timing Chain Tensioner
ItemPart NumberDescription
16L266BTiming chain tensioner - LH
26C261Variable Camshaft Timing (VCT) housing - LH
36M280VCT oil control solenoid assembly - LH

PART DESCRIPTION CHART

Scheme 61

Scheme 61: RH Variable Camshaft Timing (VCT) Housing and VCT Solenoid
Scheme 61: RH Variable Camshaft Timing (VCT) Housing and VCT Solenoid
ItemPart NumberDescription
16M280Front camshaft bearing cap - RH
26C261Variable Camshaft Timing (VCT) housing - RH
36C260VCT oil control solenoid assembly - RH

PART DESCRIPTION CHART

Scheme 62

Scheme 62: Variable Camshaft Timing (VCT) Housing
Scheme 62: Variable Camshaft Timing (VCT) Housing
ItemPart NumberDescription
1Variable Camshaft Timing (VCT) oil control solenoid assembly
2VCT housing

PART DESCRIPTION CHART

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