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Idahome
Joined: Wed May 2nd, 2018
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New in box lifters have a coating on them and no rust
Those have been sitting on a shelf somehwere for who knows?
I would use melling
I will say I have seen a collapsed lifter on OHV 4.0L engines maybe twice in my wrenching history. Most of them get weak and tick at cold start but eventually pump up and the ticking stops. This is usually over 250-350K miles
I wish I was there to hear the noise with the engine running.....
I had a 4.0L conversion I did into a 96 Ranger (4 banger auto to 4.0 and 5 speed) tic tick tick.... did new lifters, pushrods, rocker arms and all gaskets....tick tick tick still here it ended up being the NEW oil pump pickup tube connection and low oil pressure on cold start for that engine. But that ticking went away did not get worse.
If it was an injector noise you would notice a miss at idle
If it was exhaust it would show soot and usually gets lessend when things warm up and metals expand
If its a pushrod bouncing around in there then you need to find the abnormal wear spots on the pushrods and rocker arm cups to identify the bad cylinder
You should take a really close look at all of the parts you remove
This is a PITA and I feel for you
I have been through this on V6 and V8 engines, nothing sucks worse and drains your wallet like having to keep pulling heads........
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I build custom RBV, specializing in drivetrain conversions, wiring, suspension and complete custom trucks