4.0 OHV tapping

[wakingtowinter]

I finished up putting a new motor and trans in my truck last night. I got the engine from a wrecking yard for $450. It came out of a totaled 1994 explorer with 80K on it and was classified as a "grade A part", which probably doesn't mean much in a wrecking yard. I filled it with fresh synthetic. Now when I started it up it took a few cranks for it to wake up, and when it started, it had a loud tapping noise. Now that noise has quieted down quite a lot, but I can't tell if it's going away completely. I'm afraid it's not going away. I've heard these engines may need to be driven a bit before the noises go away, if they've been sitting for a while. Can anyone tell me if this is normal at all or did I get a bad egg? I got a 30 day warranty with the engine so I can take it back there on Monday if I need to. Someone please tell me I do not need to do this again...

 

[Sasquatch_Ryda]

Pretty normal for the 4.0L to have some valve train noise at start up...especially after sitting for a while.

 

[wakingtowinter]

Very good, thanks. It seems to be going away.

 

[DirtRoadRider]

Its normal,mine does it especially when its cold.
But after it gets warm,it goes away.

 

[basshead]

what happened to your old engine if you dont mind me asking? i just threw in a brand new tranny in mine last year, and just got my truck back on the road two days ago, put a brand new bored 4.0L in it. water locked my old one