Do you have to drop the engine to replace oil pump in 2007 gmc yukon

You have to remove the engine front cover (over timing chain) and remove the oil pan to get the oil pump in and out. You don't have to remove the heads, however.

Removal & Installation

4.8L, 5.3L, 6.0L & 6.2L Engines






Fig. Exploded view of the oil pump mounting-4.8L, 5.3L, 6.0L and 6.2L engines


Fig. Oil pump disassembly-4.8L, 5.3L, 6.0L and 6.2L engines

1. Remove or disconnect the following:
   
   
   NOTE
   
   Do not allow dirt or debris to enter the oil pump assembly, cap ends as necessary.
   
   
   
   
   NOTE
   
   The internal parts of the oil pump assembly are not serviced separately (excluding the spring). If the oil pump components are worn or damaged, replace the oil pump as an assembly. Do not attempt to repair the wire mesh portion of the pump and screen assembly.
   
   
   
   
   
   Engine front cover Oil pan Oil pump screen bolt and nuts Oil pump screen with O-ring seal. O-ring seal from the pump screen. Discard the O-ring seal. Remaining crankshaft oil deflector nuts. Crankshaft oil deflector Oil pump bolts
   
   
   
   
   
   
   
   Oil pump To install:
   
   
   
   
   NOTE
   
   Inspect the oil pump and engine block oil gallery passages. These surfaces must be clear and free of debris or restrictions.
   
   
   
   
   
   
   1. Align the splined surfaces of the crankshaft sprocket and the oil pump drive gear and install the oil pump. Install the oil pump onto the crankshaft sprocket until the pump housing contacts the face of the engine block.
   
   
   
   2. Install or connect the following:
      
      
      NOTE
      
      Lubricate a NEW oil pump screen O-ring seal with clean engine oil.
      
      
      
      
      NOTE
      
      Push the oil pump screen tube completely into the oil pump prior to tightening the bolt. Do not allow the bolt to pull the tube into the pump.
      
      
      
      
      
      Oil pump bolts. Tighten the oil pump bolts to 18 ft. lbs. (25 Nm). Crankshaft oil deflector
      
      
      
      
      
      
      
      NEW O-ring seal onto the oil pump screen
      
      
      
      
   
   
   
   3. Align the oil pump screen mounting brackets with the correct crankshaft bearing cap studs.
   
   
   
   4. Install or connect the following:
      
      
      
      
      Oil pump screen Oil pump screen bolt and the deflector nuts. Tighten the bolt to 106 inch lbs. (12 Nm) and the nuts to 18 ft. lbs. (25 Nm). Oil pan Engine front cover