4.0 tapping noise

Eddie Greenlee

TJ Addict
Supporting Member
Joined
Mar 5, 2016
Messages
2,613
Location
Mississippi
If my 97 4.0 6cyl went out and I had to replace it, where should I start my search and what should I buy, like new / used ?
Thanks.
 
These are known for valve train noise buddy. I’ve also known of them going a lot of miles with a cracked piston skirt, etc. The 4.0 is tough, if it is anything.
 
Should I have them replaced ?
I did the work my self, but since I was pulling the head to replace the lifters I opted to also replace the water pump, thermostat, and timing sprockets and chain while I had everything torn apart. I'm at 200k and it runs really well. If you do pull the head, inspect the cylinders. If you pay a shop it's going to be $$
 
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Oh ya, I just re-read your post @Eddie Greenlee - you're saying "if". I wouldnt worry about it. If its not blowing clouds of smoke, burning quarts of oil and misfiring uncontrollably, I wouldn't worry much about it. Cross that bridge when you get to it. If you daily your TJ but got a little money put aside, don't touch it in case and keep on moving.
 
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I did the work my self, but since I was pulling the head to replace the lifters I opted to also replace the water pump, thermostat, and timing sprockets and chain while I had everything torn apart. I'm at 200k and it runs really well. If you do pull the head, inspect the cylinders. If you pay a shop it's going to be $$
I’ve never done that before. Not sure I have the experience needed for that challenge
 
Oh ya, I just re-read your post @Eddie Greenlee - you're saying "if". I wouldnt worry about it. If its not blowing clouds of smoke, burning quarts of oil and misfiring uncontrollably, I wouldn't worry much about it. Cross that bridge when you get to it. If you daily your TJ but got a little money put aside, don't touch it in case and keep on moving.
Well y’all hit the nail on the head. It’s tapping pretty good upon startup. But It quiets down as I drive.
 
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