need advice on engine problems!!!!

[Relentlesslife7]

aight so i just bought a 91 240sx. i planned on buying a new motor for the car, but i wanna know how much work it would take to use the one i have. its a ka18 motor, and it doesnt run. i was told it was the oil pump.i was also told that they turned the motor and everything looked okay. so i wanted to see. we charged the battery, and figured that with the valve cover off, if the oil pump was still good, it would squirt a little oil out when we tried ta turn it. we tried but nothing. although it kinda sounded like the starter wasnt spinning. we even tried taking the spark plugs out to lose compression, but still same problem. now if the oil pump really did go, i dont know what it did to the motor. so if anyone can help me out with some advice or suggests, id really appreciate it. maybe i should stick with buying a new motor?

[Twilight sentra tuner]

i'd buy a new motor. usually when an oil pump goes the engine soon follows. for example, if the oil pump breaks in an engine, the oil doesn't get circulated through the motor. this means there's no lubrication. and pieces will eventually start to melt together because its metal to metal like the main bearings and the bearing inserts. if these melt together then it prevents the motor from turning over at all. ur best bet would be buying a new motor. it would probably be more cost-efficient anyway.

[Relentlesslife7]

thanx for the help, im actuallt tring to find a new motor at the moment

[MaximA32]

Nissan never made a KA18. I think you're mixing up the CA18 and the KA24. If your car is USDM and hasn't been swapped, it's the KA24DE.

[Relentlesslife7]

Nissan never made a KA18. I think you're mixing up the CA18 and the KA24. If your car is USDM and hasn't been swapped, it's the KA24DE.

yeah i have a ca18 motor, i was just typing really quick and didnt realize it till i posted. srry for the confusion guys.