Serious Knocking!!!!

[JaaDogg]

Here is the long and short of it... I had a serious knocking noise, took my car to a ****ty shop and eventually had a "used" engine put in the 89 240sx I call my daily driver. The car stopped knocking for a while but basically returned back to knocking... The lifters have been changed so many times I have lost count. Sometimes it is quiet but most of the time it knocks, especially after it has bee driven for a long distance (try not to do that anymore). Is there anything else aside from the lifters that could cause that knocking noise? Any help or advice would be greatly appreciated.

[LayNLow240]

if its loud and sounds like marbles in a tin can then youve prob got a rod knock. check your oil to be sure you have some in there and that its not low. if its still knocking then take off a plug wire one by one while its running(and knocking) and when it stops thats the one thats knocking. if that makes it stop time for a rebuild or new engine. if you drive on it much anymore you could punch a hole in your block.

[rogoman]

The 89 - 90 SOHC motors had oil pumps that had early failures. The best advice when buying a used SOHC motor is to just replace the oil pump before you use it.