REMOVAL & INSTALLATION
See Figure 1
- Disconnect the negative (-) battery cable.
- Remove the engine from the vehicle as outlined in this section.
- Remove the rocker arm cover and rocker arm assembly.
- Label and remove the pushrods.
- Remove the tappet chamber cover and oil feed pipe.
- Remove the camshaft oil seal retainer.
- Remove the timing pulley housing.
- Remove the camshaft as outlined in this section.
- Remove and label the tappets.
- Install the tappets into their original locations.
- Install the camshaft as outlined in this section.
- Install the timing pulley housing.
- Install the camshaft oil seal retainer.
- Install the tappet chamber cover and oil feed pipe.
- Install the pushrods into their original locations.
- Install the rocker arm assembly and cover.
- Install the engine into the vehicle as outlined in this section.
- Connect the negative (-) battery cable, refill all engine fluids, start the engine and check for leaks.
See Figure 2
- Remove the rocker arm cover.
- Remove the cylinder head assembly from the engine.
- Remove the bolts retaining the lifter anti-rotation brackets, then remove the brackets.
- Remove the hydraulic roller lifters from the bores.
If installing a new lifter, coat the lifter body with a suitable camshaft prelube.
- Install each hydraulic lifter to its bore being careful to align the flat sides (top) of the lifters with the flat sides of the anti-rotation brackets. When properly installed the flat sides of each lifter are aligned parallel to the anti-rotation bracket. The roller at the bottom of the lifter is parallel to the camshaft lobe.
Make sure to properly align and install each lifter as improper installation of the lifters or brackets could result in engine damage.
- Install the anti-rotation bracket retaining bolts and tighten to 97 inch lbs. (11 Nm).
- Install the cylinder head.
- Install the rocker arm cover.
See Figures 3, 4, 5, 6, 7, 8 and 9
Some engines may have either standard size and 0.010 in. (0.25mm) or oversize valve lifters. The cylinder block will be marked with a white paint mark and 0.25mm O.S. stamp where the oversize lifters are used. If lifters replacement is necessary, use new lifters with a narrow flat along the lower 3 / 4 of the body length. This provides additional oil to the cam lobe and lifter surfaces.
Using a Hydraulic Lifter Remover tool J-9290-1 (slide hammer type) or J-3049-A (plier type) will greatly ease the removal of stuck lifters.
- Remove the rocker arm covers.
- Remove the intake manifold.
- Remove the rocker arm nuts and balls.
- Remove the rocker arms and pushrods.
If any valve train components (lifters, pushrods, rocker arms) are to be reused, they must be tagged or arranged during removal to assure installation in their original locations.
- Remove the lifters from the bores.
- For proper rotation during engine operation, the lifter bottom must be convex. Check the lifter bottom for proper shape using a straightedge. If the lifter bottom is not convex, replace the lifter. Chances are if lifters are in need of replacement, so is the camshaft.
- Lubricate and install the lifters. If installing new lifters, coat the lifter body and foot using Molykote® or an equivalent prelube, then add 1051396 or an equivalent engine oil supplement to the crankcase.
- Install the pushrods, rocker arms, rocker arm nuts and balls, then properly adjust the valve lash.
- Install the intake manifold.
- Install the rocker arm covers.
The camshaft directly actuates the rocker arms or the valve on the overhead shaft engine. Refer to camshaft and rocker arm shaft procedures for valve train service on these type engines.