Disassembly, Inspection and Assembly

Disassembly
1. Remove exhaust manifolds from cylinder head.





2. Remove rocker shafts with rocker arms.
^ Bolts should be loosened in two or three steps.

3. Remove hydraulic valve lifters and lifter guide.
^ Hold hydraulic valve lifters with wire so that they will not drop from lifter guide.





4. Remove oil seal and camshaft.
^ Before removing camshaft, measure camshaft end play.





5. Remove valve components with Tool.
6. Remove valve oil seals with Tool or suitable tool.





Assembly
1. Install valve component parts.
^ Always use new valve oil seal.
^ Before installing valve oil seal, install inner valve spring seat.
^ Install outer valve spring (uneven pitch type) with its narrow pitch side toward cylinder head side.
^ After installing valve component parts, use plastic hammer to lightly tap valve stem tip to assure a proper fit.





2. Install camshafts, locator plates and cylinder head rear covers.
^ Set knock pin of camshaft at the top.





3. Install valve lifters into valve lifter guide.
^ Assemble valve lifters to their original position and hold all valve lifters with wire to prevent lifters from falling off.
^ After installing them, remove the wire.





4. Install rocker shafts with rocker arms.
^ Tighten bolts gradually in two or three stages.
^ Before tightening, be sure to set camshaft the lobe at the position where lobe is not lifted.

a. Set No. 1 piston at T.D.C. on its compression stroke and tighten rocker shaft bolts for No. 2, No. 4 and No. 6 cylinders.
b. Set No.4 piston at T.D.C. on its compression stroke and tighten rocker shaft bolts for No. 1, No. 3 and No. 5 cylinders.

5. Install exhaust manifold to cylinder head in reverse order of removal.