2007 Commander XK Factory Service Manual 9 - ENGINE

LUBRICATION

DESCRIPTION

The lubrication system is a full flow filtration pressure feed type.





OPERATION

Oil from the oil pan is pumped by a gerotor type oil pump directly mounted to the crankshaft nose. Oil pressure is controlled by a relief valve mounted inside the oil pump housing.

The camshaft exhaust valve lobes and rocker arms are lubricated through a small hole in the rocker arm; oil flows through the lash adjuster then through the rocker arm and onto the camshaft lobe. Due to the orentation of the rocker arm, the camshaft intake lobes are not lubed in the same manner as the exhaust lobes. The intake lobes are lubed through internal passages in the camshaft. Oil flows through a bore in the number 3 camshaft bearing bore, and as the camshaft turns, a hole in the camshaft aligns with the hole in the camshaft bore allowing engine oil to enter the camshaft tube. The oil then exits through 1.6mm (0.063 in.) holes drilled into the intake lobes, lubricating the lobes and the rocker arms.


Engine Lubrication Flow Chart—Block: Table 1

FROM
  		TO
  
Oil Pickup Tube
  		Oil Pump
  
Oil Pump
  		Oil Filter
  
Oil Filter
  		Block Main Oil Gallery
  
Block Main Oil Gallery
  
  • 1. Crankshaft Main Journal
 
  • 2. Left Cylinder Head*
 		  
  • 3. Right Cylinder Head*
 		  
Crankshaft Main Journals
  		Crankshaft Rod Journals
  
Crankshaft Number One Main Journal
  
  • 1.Front Timing Chain Idler Shaft
 
  • 2.Both Secondary Chain Tensioners
 		  
Left Cylinder Head
  		See Table 2
  
Right Cylinder Head
  		See Table 2
  
* The cylinder head
gaskets have an oil restricter to control oil flow to the cylinder heads.
  


Engine Lubrication Flow Chart—Cylinder Heads: Table 2

FROM
  		TO
  
Cylinder Head Oil Port (in bolt hole)
  		Diagonal Cross Drilling to Main Oil Gallery
  
Main Oil Gallery (drilled through head from rear to front)
  
  • 1. Base of Camshaft Towers
 
  • 2. Lash Adjuster Towers
 		  
Base of Camshaft Towers
  		Vertical Drilling Through Tower to Camshaft Bearings**
  
Lash Adjuster Towers
  		Diagonal Drillings to Hydraulic Lash Adjuster Pockets
  
** The number three camshaft bearing journal feeds oil into the hollow camshaft tubes. Oil is routed to the intake lobes, which have oil passages drilled into them to lubricate the rocker arms.