Inspection
Inspect rocker arm for scoring, wear on roller or damage to rocker arm. Check point where rocker arms mount to the shafts for wear or damage. Replace if damaged or worn. Check oil holes for clogging with small wire.
| CAUTION | Set crankshaft to 3 notches before TDC. (Scheme 2), before installing rocker arm shafts. |
Scheme 1
- Install rocker arm/hydraulic lash adjuster assembly. Ensure adjusters are at least partially full of oil. This can be determined by the presence of little or no plunger travel when the lash adjuster is depressed.
- If there is excessive plunger travel, place rocker arm assembly into clean engine oil and pump plunger until lash adjuster travel is taken up. If travel is not reduced, replace hydraulic lash adjuster and rocker arm assembly.
- Install rocker arm and shaft assemblies with notch in rocker arm shafts pointing up and toward timing belt side of engine. see scheme 10Install retainers in their original positions on exhaust and intake shafts. Tighten rocker arm shaft bolts starting with center and then alternately and evenly to the outside. see scheme 11
| CAUTION | When installing the intake rocker arm shaft assembly, ensure plastic spacers do not interfere with spark plug tubes. If spacers interfere, rotate tubes until they are at proper angle. DO NOT attempt rotating the spacers by pressing down on the shaft assembly. |
Scheme 2
Inspect water pump and replace if it has one or more of the following defects
- Cracks or damage on body.
- Coolant leaks from water pump shaft seal weep hole (evident by coolant traces on pump body).
- Loose or rough bearing.
- Impeller rubs either pump body or engine block.
- Impeller loose or damaged.
- Sprocket or sprocket flange loose or damaged.
- Clean all parts thoroughly. Mating surface of the oil pump should be smooth. Replace pump cover if it is scratched or grooved. Lay a straightedge across the pump cover surface. If a .003" (.076 mm) feeler gauge can be inserted between cover and straight edge, cover should be replaced.
- Measure thickness and diameter of outer rotor. If outer rotor thickness measures .301" (7.64 mm) or less, or if the diameter is 3.148" (79.95 mm) or less, replace the outer rotor.
- If inner rotor measures .301" (7.64 mm) or less, replace inner rotor. Slide outer rotor into pump housing, press to one side with fingers and measure clearance between rotor and housing. If measurement is .015" (.39 mm) or more, replace housing as outer rotor is within specification.
- Install inner rotor into pump housing. If clearance between inner and outer rotors is .008" (.203 mm) or more, replace both rotors. Place a straightedge across the face of the pump housing, between bolt holes.
- Replace pump assembly if a feeler gauge of .004" (.102 mm) or more can be inserted between rotors and the straightedge.
- Inspect oil pressure relief valve plunger for scoring and free operation in bore. Minor marks may be removed with 400 grit sandpaper. Relief valve spring has a free length of 2.39" (60.7 mm). Spring should test between 18-19 lbs. (8.1-8.6 kg) when compressed to 1.60" (40.5 mm). Replace relief valve, if spring is not within specification.
