Lifter adjustment?
Posting Guru
Joined: Sep 2004
Posts: 1,915
Likes: 1
From: Yokosuka, Honshu, Japan
The 4.0 OHV engines had non-adjustable lifters. The tapping is from wear on the pushrods / rocker arms. You can buy the replacement sockets for the rocker arms and new pushrods and install them.
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
They are hydraulic lifters, and self adjust, but it is fairly common for 2.9/4.0 OHV engines to have premature lifter failure. If its a knock or a rapping then its the lifters collapsing, but if its "clicking/light tapping" like noise, then its probably valve train wear like it was said.
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