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Home >> Jeep >> 2007 >> Wrangler Rubicon, Standard >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 3.8L Engine (Service Information) >> Cylinder Head >> Springs-Valve >> Removal >> Valve Springs - Cylinder Head On

Valve Springs - Cylinder Head On

Fig 1: Valve Spring - Remove/Install (Head On)
GC0064359Courtesy of CHRYSLER LLC
1 - SPECIAL TOOL 8453
2 - BOLTS - SPECIAL TOOL ATTACHING
3 - AIR SUPPLY HOSE ADAPTER
  1. Disconnect negative cable from battery.
  2. Remove spark plug wires and all spark plugs.
  3. Remove cylinder head cover(s). See REMOVAL .
    Fig 2: Rocker Arms & Shaft
    GC0064360Courtesy of CHRYSLER LLC
    1 - ROCKER ARMS AND SHAFT ASSEMBLY
    2 - ROCKER SHAFT BOLTS
  4. Remove rocker arms and shaft (1). See REMOVAL .
  5. Rotate engine until the piston in the cylinder bore requiring spring removal is at TDC.
    Fig 3: Valve Spring - Remove/Install (Head On)
    GC0064359Courtesy of CHRYSLER LLC
    1 - SPECIAL TOOL 8453
    2 - BOLTS - SPECIAL TOOL ATTACHING
    3 - AIR SUPPLY HOSE ADAPTER
  6. Install Special Tool 8453 (1) to the cylinder head. Tighten the attaching bolts to 23 N.m (200 in. lbs.).
  7. Install a spark plug adapter (3) in the spark plug hole. Connect air hose that can supply 620.5-689 kPa (90-100 psi) of air pressure to adapter. This is to hold valves in place while servicing components.
  8. Locate the forcing screw and spring retainer adapter assembly over the spring requiring removal.
  9. Slowly turn the forcing screw clockwise (compressing the valve spring) until the valve keepers can be removed.
  10. Turn forcing screw counterclockwise to relieve spring tension. Remove retainer and valve spring.
  11. Repeat procedure for each cylinder requiring valve spring removal.
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