Take off the valve covers on the top end of your engine. Remove the rocker arms and the push rods will free up. Pull each push rod out one by one inspecting each to see if any of them are bent. For re-installation prep the heads by cleaning any residue on the housing. Inspect rocker arms as the new push rods have to re-seat unless you purchase new rocker arms. Replace gaskets and seal with RTV after the arms and rods have been properly torqued. Good Luck!
If you are refering to the 4.0 liter s.o.h.c.,which I think you are. It does not have (tappets) lifters. Its a single overhead cam engine.(no pushrods or lifters)The values are opened directly by the cam.
Take off valve covers, heads an intake manifold with throttle body, pull out lifters and pushrods and simply replace It's not necessary to remove the heads for this procedure.
remove intake manifold and rocker covers. loosen nuts on rockers and remove pushrods. lifters should lift right out of their bores.
Remove distributor, disconnect hoses and cables from carb and intake manifold. Remove intake manifold.remove valve covers,loosen rockers and remove pushrods Insure that pushrods go back onto the same lifter,and rocker.remove exhaust manifold,remove head. clean gasket surfaces. Install new gaskets, reassemble.
If we are talking about valve lifters, remove cylinder head and pushrods and lifters will be excessable.
Remove manifolds, plugs/wires. Then just remove bolts around perimeter. Before you pull, loosen rockers so can pull pushrods & if reusing keep them in order.
the intake pushrods are shorter of the 2, all intake valves you can see with the intake off those pushrods go there, the rest are exhaust pushrods install in remaining holes
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