Noisy hydraulic lifters

SOURCE: hydraulic lifters

Yes, but there is still a lot of stuff to move out of the way to get in there and pull them. I would try all the chemical remedies for sticky lash adjusters (oil flush, marvel's mystery oil, etc.) first, then check the timing belt to see if a worn timing belt has let it slip a tooth and the valve timing is off for that reason before digging into the lifters. There used to be a forum that had video and audio from a subaru legacy this model before and after swapping out a bad lifter. Google for it and see if the noise matches.

SOURCE: very noisy squeky fron suspension on jaguar xj8

You might need a lube job or you may need to see if noise is coming from another place such as your engine water pump, brakes, power steering. Look for leaks.

SOURCE: mechanical or hydraulic lifters for my '99 montero sport??

Hydraulic

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SOURCE: Replacing Hydraulic Lifters

YOU HAVE TO REMOVE VALVE COVERS LOOSEN REMOVE ROCKER ARMS ASSEMBLY KEEP ROCKER ARM ASSEMBLY IN ORDER SO THEY GO BACK IN THE ORIGINAL POSITION.YOU HAVE TO REMOVE INTAKE MANIFOLD ALSO.YOU NEED A REPAIR MANUAL FOR TORQUE SEQUENCE ON THE INTAKE MANIFOLD AND ROCKER ARMS TORQUE.

SOURCE: can noisy Hydraulic roller lifters

Possible. I have replaced the roller rocker arms and push rods because they get clogged and wear out both parts. I guess if left to long they would punch a hole threw the arms and knock alot louder.